chore(dev): release 0.4.0

.gitignore

@@ -7,12 +7,9 @@ list.json
 man 
 
 # build artifacts
-*.spall
 builds
 envr
 envr-go
 findr/findr
-findr/findr-prof
-findr/bench-*.md
 result
 version.odin

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.4.0](https://github.com/sbrow/envr/compare/v0.3.0...v0.4.0) (2026-06-17)
+
+
+### Features
+
+* Replaced `fd` with custom internals. ([1fc5f82](https://github.com/sbrow/envr/commit/1fc5f8280e4a67b67bc14c08eb50ec4334e09cda))
+
 ## [0.3.0](https://github.com/sbrow/envr/compare/v0.2.1...v0.3.0) (2026-06-16)
 
 Version 0.3.0 represents a significant departure (and improvement) for envr.

cmd_check.odin

@@ -5,6 +5,8 @@ import "core:os"
 import "core:path/filepath"
 
 cmd_check :: proc(cmd: ^Command) {
+	feats := check_features()
+
 	check_path: string
 	if len(cmd.args) > 0 {
 		check_path = cmd.args[0]
@@ -40,6 +42,15 @@ cmd_check :: proc(cmd: ^Command) {
 	files_in_path: [dynamic]string
 
 	if is_dir {
+		if cant_scan(feats) {
+			fmt.wprintln(
+				cmd.err,
+				"Error: please install fd to use the check command (https://github.com/sharkdp/fd)",
+				flush = false,
+			)
+			return
+		}
+
 		scanned, scan_ok := scan_path(abs_path, db.cfg)
 		if !scan_ok {
 			fmt.wprintln(cmd.err, "Error scanning directory for .env files", flush = false)

cmd_deps.odin

@@ -17,6 +17,12 @@ cmd_deps :: proc(cmd: ^Command) {
 		append(&rows, []string{"Git", "\u2717 Missing"})
 	}
 
+	if .Fd in feats {
+		append(&rows, []string{"fd", "\u2713 Available"})
+	} else {
+		append(&rows, []string{"fd", "\u2717 Missing"})
+	}
+
 	if terminal.is_terminal(os.stdout) {
 		render_table(cmd.out, headers, rows[:])
 	} else {

cmd_scan.odin

@@ -6,6 +6,16 @@ import "core:os"
 import "core:terminal"
 
 cmd_scan :: proc(cmd: ^Command) {
+	feats := check_features()
+	if cant_scan(feats) {
+		fmt.wprintln(
+			cmd.err,
+			"Error: please install fd to use the scan command (https://github.com/sharkdp/fd)",
+			flush = false,
+		)
+		return
+	}
+
 	db, db_ok := db_open(cmd.config_path)
 	if !db_ok {
 		return

config.odin

@@ -6,8 +6,6 @@ import "core:os"
 import "core:path/filepath"
 import "core:strings"
 
-import "findr"
-
 SshKeyPair :: struct {
 	Private: string `json:"private"`,
 	Public:  string `json:"public"`,
@@ -220,7 +218,22 @@ search_paths :: proc(cfg: Config) -> (paths: [dynamic]string) {
 
 find_git_roots :: proc(cfg: Config) -> (roots: [dynamic]string, ok: bool) {
 	paths := search_paths(cfg)
-	findr.find_repos(paths[:], &roots, os.get_processor_core_count())
+
+	for sp in paths {
+		args := []string{"fd", "-H", "-t", "d", "^\\.git$", sp}
+		lines, fd_ok := run_fd(args)
+		if !fd_ok {
+			return
+		}
+
+		for line in lines {
+			cleaned, _ := filepath.clean(line)
+			parent := filepath.dir(cleaned)
+			cloned, _ := strings.clone(parent)
+			append(&roots, cloned)
+		}
+	}
+
 	ok = true
 	return
 }

db.odin

@@ -517,8 +517,8 @@ update_dir :: proc(f: ^EnvFile, new_dir: string) {
 
 find_moved_dirs :: proc(d: ^Db, f: ^EnvFile) -> ([dynamic]string, bool) {
 	feats := check_features()
-	if .Git not_in feats {
+	if .Fd not_in feats || .Git not_in feats {
-		fmt.println("Error: git is required for moved dir detection")
+		fmt.println("Error: fd and git are required for moved dir detection")
 		return {}, false
 	}
 

features.odin

@@ -7,6 +7,7 @@ import "core:strings"
 
 Feature :: enum {
 	Git,
+	Fd,
 }
 
 AvailableFeatures :: bit_set[Feature]
@@ -26,6 +27,9 @@ check_features :: proc() -> AvailableFeatures {
 	if find_binary(paths, "git") != "" {
 		feats += {.Git}
 	}
+	if find_binary(paths, "fd") != "" {
+		feats += {.Fd}
+	}
 
 	return feats
 }

findr/PLAN.md

@@ -0,0 +1,177 @@
+# findr — Gitignored File Finder
+
+## Overview
+
+findr is a native Odin tool that finds **gitignored files** within git repositories. It replaces envr's current approach of running `fd` twice (all files vs. unignored files) and diffing the results.
+
+**Simplified scope:** findr does one thing — walks directories, finds git repos, reads each repo's `.gitignore`, and prints every gitignored file. No flags, no filtering, no pattern matching. envr handles result filtering itself.
+
+## Current fd Usage in envr (being replaced)
+
+1. **`scan.odin:13-43`** (`scan_path`) — runs `fd` twice per search path:
+   - Run 1: `fd -a <matcher> [-E <exclude>]... -HI <path>` → all files including gitignored
+   - Run 2: `fd -a <matcher> [-E <exclude>]... -H <path>` → hidden but NOT gitignored
+   - Diff = gitignored files only
+2. Both go through `run_fd` (`scan.odin:68-118`), which spawns a subprocess and captures output via temp files.
+
+After findr integration, `scan_path` calls `findr.walk(path)` directly — no subprocess, no double-run, no diff.
+
+## Directory Structure
+
+```
+findr/
+  findr.odin           # main + CLI (positional dir args only)
+  walker.odin          # recursive directory walker using core:sys/linux getdents
+  gitignore.odin       # .gitignore parsing + glob→regex transpilation + matching
+  test_env.odin        # test harness: temp dir, mock filesystem, assert helpers
+  findr_test.odin      # integration tests (10 tests)
+  gitignore_test.odin  # transpilation + matching unit tests (22 tests)
+```
+
+## Decisions
+
+- **Scope**: findr prints ALL gitignored files. No regex filtering, no exclude patterns, no type filters. envr post-processes the output.
+- **Gitignore matching**: Transpile gitignore glob patterns to regex, then use `core:text/regex`. No dedicated glob matcher.
+- **Stat avoidance**: Use `core:sys/linux` getdents directly — read `dirent.type` from the kernel, never call stat.
+- **Architecture**: Separate directory with its own `main`. Core logic (`walk` proc + `gitignore` package) designed to be importable into envr later.
+
+## CLI Interface
+
+```
+findr [dir1] [dir2] ...
+```
+
+No flags. Defaults to `.` if no dirs given. Prints absolute or relative paths (as given) to stdout, one per line.
+
+## Build
+
+```bash
+odin build findr -o:speed -out:findr/findr
+```
+
+## How It Works
+
+```
+walk(dir):
+  entries = getdents(dir)         # via core:sys/linux, zero stat calls
+  if entries contains ".git/":
+    gi = parse(.gitignore)        # if present
+    for entry in entries:
+      if entry is gitignored file:
+        emit entry path
+      if entry is dir (not ignored):
+        walk(entry)               # recurse to find nested repos
+  else:
+    for entry in entries:
+      if entry is dir:
+        walk(entry)               # descend looking for repos
+```
+
+Key behaviors:
+- **Nested repos**: When a repo is found, subdirectories are still traversed to find nested repos. Gitignored directories are pruned (not descended into).
+- **Flat gitignore**: Only the root `.gitignore` is read. `.gitignore` files in subdirectories of a repo are ignored.
+- **Non-repo dirs**: Traversed recursively to find repos. No gitignore rules apply.
+
+## Performance Architecture
+
+### Implemented
+
+- **Stat avoidance via `dirent.type`** — Uses `core:sys/linux` getdents directly, bypassing `core:os` which calls `openat` + `fstat` per entry. File type comes free from the directory entry.
+- **Prune ignored directories** — When a directory matches a gitignore pattern, it is not descended into. Skips potentially thousands of readdir calls.
+
+### Future (if needed)
+
+- Work-stealing parallel traversal (per-thread LIFO deques with batch stealing, like fd)
+- BufWriter on stdout for large result sets
+- Arena allocators for path strings
+
+## Testing Strategy
+
+- **In-process integration tests** — Tests call `walk()` directly (not via subprocess), build mock filesystems in temp dirs, and compare sorted output.
+- **Unit tests** — Pure-function tests for glob→regex transpilation and gitignore matching.
+- **Output sorting for determinism** — Always sort output lines before comparison.
+- **Memory tracking** — Odin's test runner reports leaks automatically. All 32 tests pass with zero leaks.
+
+### Test Coverage (findr_test.odin)
+
+| Test | What it covers |
+|---|---|
+| `test_basic_gitignored` | Repo with `.gitignore`, gitignored files emitted, normal files skipped |
+| `test_non_repo_not_scanned` | Dirs without `.git/` produce no output |
+| `test_negation_pattern` | `!prod.env` un-ignores a file |
+| `test_dir_only_pattern` | `node_modules/` pattern doesn't emit file results |
+| `test_multiple_repos` | Multiple repos in one tree, each with its own `.gitignore` |
+| `test_nested_repos` | Repo inside a repo, both scanned independently |
+| `test_gitignore_in_subdir_ignored` | Subdirectory `.gitignore` files are not read |
+| `test_no_gitignore_file` | Repo with `.git/` but no `.gitignore` produces nothing |
+| `test_empty_gitignore` | Comments and blank lines only → no results |
+| `test_multiple_search_dirs` | Multiple top-level search dirs in one call |
+
+### Gitignore Unit Tests (gitignore_test.odin)
+
+22 tests covering: simple/anchored patterns, `*`, `?`, `[abc]`, `[!abc]`, dot escaping, globstar variants, backslash escapes, empty patterns, basic matching, negation, dir-only, comments, blank lines, last-match-wins, env patterns.
+
+## Glob→Regex Transpilation Rules
+
+| Gitignore pattern | Regex | Notes |
+|---|---|---|
+| `foo` | `(^|/)foo(/.*)?$` | matches at any depth |
+| `/foo` | `^foo(/.*)?$` | anchored to gitignore dir |
+| `foo/` | `(^|/)foo/.*$` | directory only |
+| `*.log` | `(^|/)[^/]*\.log$` | `*` = any chars except `/` |
+| `**/foo` | `(^|/)(.*/)?foo(/.*)?$` | `**` = any chars including `/` |
+| `foo/**/bar` | `(^|/)foo/(.*/)?bar(/.*)?$` | `**` between segments |
+| `!pattern` | (handled by layer) | negation flag, not regex |
+| `#comment` | (skipped) | |
+| `[abc]` | `[abc]` | same regex syntax |
+| `?` | `[^/]` | single char, no `/` |
+
+## Implementation Phases
+
+### Phase 1: Gitignore Transpiler + Tests ✅
+
+**Goal:** Isolated, fully-tested glob→regex transpiler.
+
+**Result:** 22 tests, all passing, zero leaks.
+
+---
+
+### Phase 2: findr Walker + Tests ✅
+
+**Goal:** Working tool that finds gitignored files in git repos.
+
+**Built:**
+- `walker.odin` — Single-threaded DFS using `core:sys/linux` getdents. Finds repos, reads `.gitignore`, emits gitignored files, recurses into subdirs for nested repos.
+- `findr.odin` — Minimal CLI: `findr [dirs...]`, no flags.
+- `test_env.odin` — Test harness with temp dirs and mock filesystems.
+- `findr_test.odin` — 10 integration tests.
+
+**Result:** All 32 tests pass (22 gitignore + 10 walker), zero leaks.
+
+---
+
+### Phase 3: Parallel Traversal (future)
+
+**Goal:** Parallelize directory descent for large trees.
+
+---
+
+### Phase 4: Benchmark (future)
+
+**Goal:** Quantify performance vs fd on large directory trees.
+
+---
+
+### Phase 5: Integrate into envr (future)
+
+**Goal:** Replace `run_fd` in `scan.odin`. `scan_path` calls `findr.walk()` directly instead of two subprocess runs + diff.
+
+## Risks
+
+| Risk | Mitigation |
+|---|---|
+| Single-threaded may be slow on huge trees | Add threading in Phase 3 after correctness |
+| Gitignore edge cases (`**/foo`, `foo/**/bar`) | Comprehensive gitignore_test.odin with spec examples |
+| dirent.type may be UNKNOWN on some filesystems | Fall back to stat only when type is UNKNOWN |
+| Missing nested `.env` files in monorepos | Accepted limitation — flat gitignore model |
+| Memory allocation churn from path strings | Use thread-local arena allocators in Phase 3 |

findr/findr.odin

@@ -0,0 +1,33 @@
+package findr
+
+import "core:fmt"
+import "core:os"
+
+main :: proc() {
+	args := os.args
+
+	search_dirs := make([dynamic]string)
+	defer delete(search_dirs)
+
+	for i in 1..<len(args) {
+		append(&search_dirs, args[i])
+	}
+
+	if len(search_dirs) == 0 {
+		append(&search_dirs, ".")
+	}
+
+	results := make([dynamic]string)
+	defer {
+		for r in results { delete(r) }
+		delete(results)
+	}
+
+	for dir in search_dirs {
+		walk(dir, &results)
+	}
+
+	for r in results {
+		fmt.println(r)
+	}
+}

findr/findr_test.odin

@@ -1,15 +1,7 @@
 package findr
 
-import "core:os"
-import "core:sort"
-import "core:strings"
-import "core:sys/linux"
 import "core:testing"
 
-// ============================================================================
-// Gitignored file emission tests (emit ONLY gitignored files, descend everywhere)
-// ============================================================================
-
 @(test)
 test_basic_gitignored :: proc(t: ^testing.T) {
 	env := create_test_env()
@@ -21,9 +13,7 @@ test_basic_gitignored :: proc(t: ^testing.T) {
 	create_file(env, "repo/secrets.env")
 	create_file(env, "repo/normal.txt")
 
-	assert_output(t, env, nil, {}, {
+	assert_output(t, env, nil, {"repo/.env", "repo/secrets.env"})
-		"repo/.env", "repo/secrets.env",
-	})
 }
 
 @(test)
@@ -35,7 +25,7 @@ test_non_repo_not_scanned :: proc(t: ^testing.T) {
 	create_file(env, "norepo/.gitignore", "*.env\n")
 	create_file(env, "norepo/.env")
 
-	assert_output_empty(t, env, nil, {})
+	assert_output_empty(t, env, nil)
 }
 
 @(test)
@@ -49,9 +39,23 @@ test_negation_pattern :: proc(t: ^testing.T) {
 	create_file(env, "repo/secrets.env")
 	create_file(env, "repo/prod.env")
 
-	assert_output(t, env, nil, {}, {
+	assert_output(t, env, nil, {"repo/.env", "repo/secrets.env"})
-		"repo/.env", "repo/secrets.env",
+}
-	})
+
+@(test)
+test_dir_only_pattern :: proc(t: ^testing.T) {
+	env := create_test_env()
+	defer destroy_test_env(&env)
+
+	create_git_repo(env, "repo")
+	create_file(env, "repo/.gitignore", "node_modules/\n")
+	create_file(env, "repo/node_modules", "should not match (it's a file)")
+
+	create_dir(env, "repo/ignored_dir")
+	create_file(env, "repo/.gitignore", "ignored_dir/\n")
+
+	// dir-only patterns don't produce file results
+	assert_output(t, env, nil, {})
 }
 
 @(test)
@@ -67,9 +71,7 @@ test_multiple_repos :: proc(t: ^testing.T) {
 	create_file(env, "repo2/.gitignore", "*.key\n")
 	create_file(env, "repo2/secret.key")
 
-	assert_output(t, env, nil, {}, {
+	assert_output(t, env, nil, {"repo1/a.env", "repo2/secret.key"})
-		"repo1/a.env", "repo2/secret.key",
-	})
 }
 
 @(test)
@@ -85,13 +87,11 @@ test_nested_repos :: proc(t: ^testing.T) {
 	create_file(env, "parent/child/.gitignore", "*.key\n")
 	create_file(env, "parent/child/api.key")
 
-	assert_output(t, env, nil, {}, {
+	assert_output(t, env, nil, {"parent/top.env", "parent/child/api.key"})
-		"parent/top.env", "parent/child/api.key",
-	})
 }
 
 @(test)
-test_nested_gitignore_read :: proc(t: ^testing.T) {
+test_gitignore_in_subdir_ignored :: proc(t: ^testing.T) {
 	env := create_test_env()
 	defer destroy_test_env(&env)
 
@@ -102,43 +102,10 @@ test_nested_gitignore_read :: proc(t: ^testing.T) {
 	create_file(env, "repo/sub/secret.txt")
 	create_file(env, "repo/sub/.env")
 
-	assert_output(t, env, nil, {}, {
+	// .gitignore in subdir is not read (flat model).
-		"repo/sub/secret.txt", "repo/sub/.env",
+	// secret.txt should NOT appear (subdir .gitignore ignored).
-	})
+	// .env should NOT appear (it's nested, not top-level of repo).
-}
+	assert_output(t, env, nil, {})
-
-@(test)
-test_nested_gitignore_negation :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "*.log\n")
-	create_dir(env, "repo/sub")
-	create_file(env, "repo/sub/.gitignore", "!important.log\n")
-	create_file(env, "repo/sub/important.log")
-	create_file(env, "repo/sub/debug.log")
-
-	assert_output(t, env, nil, {}, {
-		"repo/sub/debug.log",
-	})
-}
-
-@(test)
-test_multisegment_pattern :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "build/output.txt\n")
-	create_dir(env, "repo/build")
-	create_file(env, "repo/build/output.txt")
-	create_file(env, "repo/build/other.txt")
-	create_file(env, "repo/output.txt")
-
-	assert_output(t, env, nil, {}, {
-		"repo/build/output.txt",
-	})
 }
 
 @(test)
@@ -149,7 +116,7 @@ test_no_gitignore_file :: proc(t: ^testing.T) {
 	create_git_repo(env, "repo")
 	create_file(env, "repo/.env")
 
-	assert_output_empty(t, env, nil, {})
+	assert_output_empty(t, env, nil)
 }
 
 @(test)
@@ -161,7 +128,7 @@ test_empty_gitignore :: proc(t: ^testing.T) {
 	create_file(env, "repo/.gitignore", "\n\n# comment\n\n")
 	create_file(env, "repo/.env")
 
-	assert_output_empty(t, env, nil, {})
+	assert_output_empty(t, env, nil)
 }
 
 @(test)
@@ -172,7 +139,6 @@ test_multiple_search_dirs :: proc(t: ^testing.T) {
 	create_git_repo(env, "dir1/repo")
 	create_file(env, "dir1/repo/.gitignore", "*.env\n")
 	create_file(env, "dir1/repo/a.env")
-	create_file(env, "dir1/repo/normal.txt")
 
 	create_git_repo(env, "dir2/repo")
 	create_file(env, "dir2/repo/.gitignore", "*.env\n")
@@ -185,136 +151,10 @@ test_multiple_search_dirs :: proc(t: ^testing.T) {
 
 	results := make([dynamic]string)
 	defer {
-		for r in results {delete(r)}
+		for r in results { delete(r) }
 		delete(results)
 	}
-
+	walk(dir1, &results)
-	opts := WalkOptions{}
+	walk(dir2, &results)
-	thread_count := os.get_processor_core_count()
-	walk({dir1, dir2}, &results, opts, thread_count)
-
 	testing.expect_value(t, len(results), 2)
-
-	actual := make([dynamic]string, 0, len(results))
-	for r in results {
-		stripped := r
-		if strings.has_prefix(stripped, env.temp_dir) {
-			stripped = stripped[len(env.temp_dir):]
-			if len(stripped) > 0 && stripped[0] == '/' {
-				stripped = stripped[1:]
-			}
-		}
-		append(&actual, stripped)
-	}
-	defer delete(actual)
-
-	expected := []string{"dir1/repo/a.env", "dir2/repo/b.env"}
-
-	sort.quick_sort(actual[:])
-	sort.quick_sort(expected[:])
-
-	for i in 0 ..< len(expected) {
-		testing.expect_value(t, actual[i], expected[i])
-	}
-}
-
-// ============================================================================
-// Ignored directory recursion tests
-// ============================================================================
-
-@(test)
-test_ignored_dir_descended :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "secrets/\n")
-	create_dir(env, "repo/secrets")
-	create_file(env, "repo/secrets/.env")
-	create_file(env, "repo/secrets/api.key")
-
-	// Ignored dir's contents are emitted AND descended into
-	assert_output(t, env, nil, {}, {
-		"repo/secrets/", "repo/secrets/.env", "repo/secrets/api.key",
-	})
-}
-
-@(test)
-test_nested_ignored_dir :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "build/\n")
-	create_dir(env, "repo/build")
-	create_dir(env, "repo/build/sub")
-	create_file(env, "repo/build/output.txt")
-	create_file(env, "repo/build/sub/deep.env")
-
-	assert_output(t, env, nil, {}, {
-		"repo/build/", "repo/build/output.txt",
-		"repo/build/sub/", "repo/build/sub/deep.env",
-	})
-}
-
-// ============================================================================
-// Filter tests (excludes, pattern)
-// ============================================================================
-
-@(test)
-test_excludes_prune_dirs :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "*.env\n")
-	create_file(env, "repo/.env")
-	create_dir(env, "repo/vendor")
-	create_file(env, "repo/vendor/lib.env")
-
-	assert_output(t, env, nil,
-		{excludes = {"vendor"}},
-		{"repo/.env"},
-	)
-}
-
-@(test)
-test_pattern_filters_results :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "*.env\n*.key\n")
-	create_file(env, "repo/.env")
-	create_file(env, "repo/secrets.env")
-	create_file(env, "repo/master.key")
-
-	assert_output(t, env, nil,
-		{pattern = "\\.env$"},
-		{"repo/.env", "repo/secrets.env"},
-	)
-}
-
-// ============================================================================
-// Special file type tests
-// ============================================================================
-
-@(test)
-test_fifo_emitted :: proc(t: ^testing.T) {
-	env := create_test_env()
-	defer destroy_test_env(&env)
-
-	create_git_repo(env, "repo")
-	create_file(env, "repo/.gitignore", "*.env\n*.fifo\n")
-
-	fifo_path := join_path(env.temp_dir, "repo/test.fifo")
-	defer delete(fifo_path)
-	cpath := strings.clone_to_cstring(fifo_path)
-	defer delete(cpath)
-	linux.mknod(cpath, linux.S_IFIFO | linux.Mode{.IRUSR, .IWUSR}, 0)
-
-	assert_output(t, env, nil,
-		{pattern = "\\.fifo$"},
-		{"repo/test.fifo"},
-	)
 }

findr/gitignore.odin

@@ -1,36 +1,110 @@
 package findr
 
+import "core:fmt"
 import "core:strings"
+import "core:text/regex"
 
-Gitignore :: struct {
+is_regex_meta :: proc(c: u8) -> bool {
-	rules: [dynamic]Rule,
+	switch c {
+	case '.', '+', '(', ')', '{', '}', '^', '$', '|':
+		return true
+	}
+	return false
+}
+
+glob_to_regex :: proc(pattern: string, anchored: bool) -> string {
+	sb: strings.Builder
+	strings.builder_init(&sb)
+	defer strings.builder_destroy(&sb)
+
+	if anchored {
+		fmt.sbprintf(&sb, "^")
+	} else {
+		fmt.sbprintf(&sb, "(^|/)")
+	}
+
+	i := 0
+	for i < len(pattern) {
+		c := pattern[i]
+
+		if c == '*' {
+			if i + 1 < len(pattern) && pattern[i + 1] == '*' {
+				prev_slash := i == 0 || pattern[i - 1] == '/'
+				at_end := i + 2 >= len(pattern)
+				next_slash := !at_end && pattern[i + 2] == '/'
+
+				if prev_slash && (next_slash || at_end) {
+					if next_slash {
+						i += 3
+						fmt.sbprintf(&sb, "(.*/)?")
+					} else {
+						i += 2
+						fmt.sbprintf(&sb, ".*")
+					}
+				} else {
+					fmt.sbprintf(&sb, "[^/]*")
+					i += 2
+				}
+			} else {
+				fmt.sbprintf(&sb, "[^/]*")
+				i += 1
+			}
+		} else if c == '?' {
+			fmt.sbprintf(&sb, "[^/]")
+			i += 1
+		} else if c == '[' {
+			append(&sb.buf, '[')
+			i += 1
+			if i < len(pattern) && pattern[i] == '!' {
+				append(&sb.buf, '^')
+				i += 1
+			}
+			if i < len(pattern) && pattern[i] == ']' {
+				append(&sb.buf, ']')
+				i += 1
+			}
+			for i < len(pattern) && pattern[i] != ']' {
+				append(&sb.buf, pattern[i])
+				i += 1
+			}
+			if i < len(pattern) {
+				append(&sb.buf, ']')
+				i += 1
+			}
+		} else if c == '\\' {
+			i += 1
+			if i < len(pattern) {
+				if is_regex_meta(pattern[i]) {
+					append(&sb.buf, '\\')
+				}
+				append(&sb.buf, pattern[i])
+				i += 1
+			}
+		} else if is_regex_meta(c) {
+			append(&sb.buf, '\\')
+			append(&sb.buf, c)
+			i += 1
+		} else {
+			append(&sb.buf, c)
+			i += 1
+		}
+	}
+
+	fmt.sbprintf(&sb, "(/.*)?$")
+
+	s := strings.to_string(sb)
+	result, _ := strings.clone(s)
+	return result
 }
 
 Rule :: struct {
-	pattern:  GlobPattern,
+	regex: regex.Regular_Expression,
-	negated:  bool,
+	negated: bool,
 	dir_only: bool,
 }
 
-Match :: enum {
+Gitignore :: struct {
-	None,
+	rules: [dynamic]Rule,
-	Ignored,
-	Unignored,
-}
-
-is_ignored :: proc(gi: ^Gitignore, path: string, is_dir: bool) -> bool {
-	return check_match(gi, path, is_dir) == .Ignored
-}
-
-check_match :: proc(gi: ^Gitignore, path: string, is_dir: bool) -> Match {
-	result := Match.None
-	for &rule in gi.rules {
-		if rule.dir_only && !is_dir do continue
-		if glob_match_compiled(&rule.pattern, path) {
-			result = rule.negated ? .Unignored : .Ignored
-		}
-	}
-	return result
 }
 
 parse :: proc(content: string) -> Gitignore {
@@ -72,17 +146,37 @@ parse :: proc(content: string) -> Gitignore {
 
 		if len(s) == 0 do continue
 
-		gp := glob_compile(s, anchored)
+		regex_str := glob_to_regex(s, anchored)
-		append(&gi.rules, Rule{pattern = gp, negated = negated, dir_only = dir_only})
+		re, err := regex.create(regex_str, {regex.Flag.No_Capture})
+		delete(regex_str)
+		if err != nil do continue
+
+		append(&gi.rules, Rule{
+			regex = re,
+			negated = negated,
+			dir_only = dir_only,
+		})
 	}
 
 	return gi
 }
 
+is_ignored :: proc(gi: ^Gitignore, path: string, is_dir: bool) -> bool {
+	matched := false
+	for rule in gi.rules {
+		if rule.dir_only && !is_dir do continue
+		cap, ok := regex.match(rule.regex, path)
+		regex.destroy(cap)
+		if ok {
+			matched = !rule.negated
+		}
+	}
+	return matched
+}
+
 destroy :: proc(gi: ^Gitignore) {
-	for &rule in gi.rules {
+	for rule in gi.rules {
-		glob_destroy(&rule.pattern)
+		regex.destroy(rule.regex)
 	}
 	delete(gi.rules)
 }
-

findr/gitignore_test.odin

@@ -2,6 +2,90 @@ package findr
 
 import "core:testing"
 
+@(test)
+test_glob_simple :: proc(t: ^testing.T) {
+	result := glob_to_regex("foo", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)foo(/.*)?$")
+}
+
+@(test)
+test_glob_anchored :: proc(t: ^testing.T) {
+	result := glob_to_regex("foo", true)
+	defer delete(result)
+	testing.expect_value(t, result, "^foo(/.*)?$")
+}
+
+@(test)
+test_glob_star :: proc(t: ^testing.T) {
+	result := glob_to_regex("*.log", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)[^/]*\\.log(/.*)?$")
+}
+
+@(test)
+test_glob_question :: proc(t: ^testing.T) {
+	result := glob_to_regex("?.log", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)[^/]\\.log(/.*)?$")
+}
+
+@(test)
+test_glob_char_class :: proc(t: ^testing.T) {
+	result := glob_to_regex("[abc].log", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)[abc]\\.log(/.*)?$")
+}
+
+@(test)
+test_glob_negated_class :: proc(t: ^testing.T) {
+	result := glob_to_regex("[!abc].log", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)[^abc]\\.log(/.*)?$")
+}
+
+@(test)
+test_glob_dot_escaped :: proc(t: ^testing.T) {
+	result := glob_to_regex(".env", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)\\.env(/.*)?$")
+}
+
+@(test)
+test_glob_globstar_prefix :: proc(t: ^testing.T) {
+	result := glob_to_regex("**/foo", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)(.*/)?foo(/.*)?$")
+}
+
+@(test)
+test_glob_globstar_suffix :: proc(t: ^testing.T) {
+	result := glob_to_regex("abc/**", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)abc/.*(/.*)?$")
+}
+
+@(test)
+test_glob_globstar_middle :: proc(t: ^testing.T) {
+	result := glob_to_regex("foo/**/bar", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)foo/(.*/)?bar(/.*)?$")
+}
+
+@(test)
+test_glob_backslash_escape :: proc(t: ^testing.T) {
+	result := glob_to_regex("\\!foo", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)!foo(/.*)?$")
+}
+
+@(test)
+test_glob_empty :: proc(t: ^testing.T) {
+	result := glob_to_regex("", false)
+	defer delete(result)
+	testing.expect_value(t, result, "(^|/)(/.*)?$")
+}
+
 @(test)
 test_is_ignored_basic :: proc(t: ^testing.T) {
 	gi := parse("*.env\n")
@@ -92,27 +176,3 @@ test_is_ignored_globstar :: proc(t: ^testing.T) {
 	testing.expect_value(t, is_ignored(&gi, "foo/bar/cache", false), true)
 }
 
-@(test)
-test_star_negation_subpath :: proc(t: ^testing.T) {
-	gi := parse("*\n!public/\n")
-	defer destroy(&gi)
-
-	// public dir itself is un-ignored
-	testing.expect_value(t, is_ignored(&gi, "public", true), false)
-	// children of public/ should still be ignored by *
-	testing.expect_value(t, is_ignored(&gi, "public/uuid-dir", true), true)
-	testing.expect_value(t, is_ignored(&gi, "public/uuid-dir/file.txt", false), true)
-}
-
-@(test)
-test_is_ignored_hash_pattern :: proc(t: ^testing.T) {
-	gi := parse("\\#*\\#\n")
-	defer destroy(&gi)
-
-	testing.expect_value(t, is_ignored(&gi, "#foo#", false), true)
-	testing.expect_value(t, is_ignored(&gi, "#test#", false), true)
-	testing.expect_value(t, is_ignored(&gi, "AUTHORS", false), false)
-	testing.expect_value(t, is_ignored(&gi, "build.zig", false), false)
-	testing.expect_value(t, is_ignored(&gi, "ChangeLog", false), false)
-}
-

findr/glob.odin

@@ -1,203 +0,0 @@
-package findr
-
-Range :: struct {
-	lo: u8,
-	hi: u8,
-}
-
-Class_Data :: struct {
-	negated: bool,
-	ranges:  [dynamic]Range,
-}
-
-Token_Kind :: enum u8 { Char, Star, Globstar, Question, Class }
-
-Token :: struct {
-	kind:      Token_Kind,
-	byte:      u8,
-	class_idx: u16,
-}
-
-GlobPattern :: struct {
-	tokens:   [dynamic]Token,
-	classes:  [dynamic]Class_Data,
-	anchored: bool,
-}
-
-glob_compile :: proc(pattern: string, anchored: bool) -> GlobPattern {
-	gp: GlobPattern
-	gp.tokens = make([dynamic]Token)
-	gp.classes = make([dynamic]Class_Data)
-	gp.anchored = anchored
-
-	i := 0
-	for i < len(pattern) {
-		c := pattern[i]
-
-		if c == '*' {
-			if i + 1 < len(pattern) && pattern[i + 1] == '*' {
-				prev_slash := i == 0 || pattern[i - 1] == '/'
-				at_end := i + 2 >= len(pattern)
-				next_slash := !at_end && pattern[i + 2] == '/'
-
-				if prev_slash && (next_slash || at_end) {
-					append(&gp.tokens, Token{kind = .Globstar})
-					if next_slash {
-						i += 3
-					} else {
-						i += 2
-					}
-				} else {
-					append(&gp.tokens, Token{kind = .Star})
-					i += 2
-				}
-			} else {
-				append(&gp.tokens, Token{kind = .Star})
-				i += 1
-			}
-		} else if c == '?' {
-			append(&gp.tokens, Token{kind = .Question})
-			i += 1
-		} else if c == '[' {
-			i += 1
-			negated := false
-			if i < len(pattern) && pattern[i] == '!' {
-				negated = true
-				i += 1
-			}
-
-			ranges := make([dynamic]Range)
-
-			if i < len(pattern) && pattern[i] == ']' {
-				append(&ranges, Range{lo = ']', hi = ']'})
-				i += 1
-			}
-
-			for i < len(pattern) && pattern[i] != ']' {
-				if i + 2 < len(pattern) && pattern[i + 1] == '-' && pattern[i + 2] != ']' {
-					append(&ranges, Range{lo = pattern[i], hi = pattern[i + 2]})
-					i += 3
-				} else {
-					append(&ranges, Range{lo = pattern[i], hi = pattern[i]})
-					i += 1
-				}
-			}
-
-			if i < len(pattern) {
-				i += 1
-			}
-
-			class_idx := u16(len(gp.classes))
-			append(&gp.classes, Class_Data{negated = negated, ranges = ranges})
-			append(&gp.tokens, Token{kind = .Class, class_idx = class_idx})
-		} else if c == '\\' {
-			i += 1
-			if i < len(pattern) {
-				append(&gp.tokens, Token{kind = .Char, byte = pattern[i]})
-				i += 1
-			}
-		} else {
-			append(&gp.tokens, Token{kind = .Char, byte = c})
-			i += 1
-		}
-	}
-
-	return gp
-}
-
-match_tokens :: proc(tokens: []Token, classes: []Class_Data, ti: int, path: string, pi: int) -> bool {
-	if ti >= len(tokens) {
-		return pi == len(path)
-	}
-
-	tok := tokens[ti]
-	switch tok.kind {
-	case .Char:
-		if pi < len(path) && path[pi] == tok.byte {
-			return match_tokens(tokens, classes, ti + 1, path, pi + 1)
-		}
-		return false
-
-	case .Question:
-		if pi < len(path) && path[pi] != '/' {
-			return match_tokens(tokens, classes, ti + 1, path, pi + 1)
-		}
-		return false
-
-	case .Star:
-		max_end := pi
-		for max_end < len(path) && path[max_end] != '/' {
-			max_end += 1
-		}
-		for end := max_end; end >= pi; end -= 1 {
-			if match_tokens(tokens, classes, ti + 1, path, end) {
-				return true
-			}
-		}
-		return false
-
-	case .Globstar:
-		if ti + 1 >= len(tokens) {
-			return true
-		}
-		if match_tokens(tokens, classes, ti + 1, path, pi) {
-			return true
-		}
-		for end := pi + 1; end <= len(path); end += 1 {
-			if path[end - 1] == '/' {
-				if match_tokens(tokens, classes, ti + 1, path, end) {
-					return true
-				}
-			}
-		}
-		return false
-
-	case .Class:
-		if pi >= len(path) {
-			return false
-		}
-		cd := classes[tok.class_idx]
-		ch := path[pi]
-		in_range := false
-		for r in cd.ranges {
-			if ch >= r.lo && ch <= r.hi {
-				in_range = true
-				break
-			}
-		}
-		if in_range != cd.negated {
-			return match_tokens(tokens, classes, ti + 1, path, pi + 1)
-		}
-		return false
-	}
-	return false
-}
-
-glob_match_compiled :: proc(gp: ^GlobPattern, path: string) -> bool {
-	tokens := gp.tokens[:]
-	classes := gp.classes[:]
-
-	if gp.anchored {
-		return match_tokens(tokens, classes, 0, path, 0)
-	}
-
-	if match_tokens(tokens, classes, 0, path, 0) {
-		return true
-	}
-	for i := 1; i < len(path); i += 1 {
-		if path[i - 1] == '/' {
-			if match_tokens(tokens, classes, 0, path, i) {
-				return true
-			}
-		}
-	}
-	return false
-}
-
-glob_destroy :: proc(gp: ^GlobPattern) {
-	for &cd in gp.classes {
-		delete(cd.ranges)
-	}
-	delete(gp.classes)
-	delete(gp.tokens)
-}

findr/glob_test.odin

@@ -1,111 +0,0 @@
-package findr
-
-import "core:testing"
-
-glob_match :: proc(pattern: string, path: string, anchored: bool) -> bool {
-	gp := glob_compile(pattern, anchored)
-	result := glob_match_compiled(&gp, path)
-	glob_destroy(&gp)
-	return result
-}
-
-@(test)
-test_glob_simple :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("foo", "foo", false))
-	testing.expect(t, glob_match("foo", "bar/foo", false))
-	testing.expect(t, !glob_match("foo", "foobar", false))
-	testing.expect(t, !glob_match("foo", "foo/bar", false))
-}
-
-@(test)
-test_glob_anchored :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("foo", "foo", true))
-	testing.expect(t, !glob_match("foo", "bar/foo", true))
-	testing.expect(t, !glob_match("foo", "foobar", true))
-}
-
-@(test)
-test_glob_star :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("*.log", "test.log", false))
-	testing.expect(t, glob_match("*.log", ".log", false))
-	testing.expect(t, !glob_match("*.log", "test.txt", false))
-	testing.expect(t, !glob_match("*.log", "dir/test", false))
-}
-
-@(test)
-test_glob_question :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("?.log", "a.log", false))
-	testing.expect(t, !glob_match("?.log", "ab.log", false))
-	testing.expect(t, !glob_match("?.log", ".log", false))
-}
-
-@(test)
-test_glob_char_class :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("[abc].log", "a.log", false))
-	testing.expect(t, glob_match("[abc].log", "b.log", false))
-	testing.expect(t, !glob_match("[abc].log", "d.log", false))
-}
-
-@(test)
-test_glob_negated_class :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("[!abc].log", "d.log", false))
-	testing.expect(t, !glob_match("[!abc].log", "a.log", false))
-}
-
-@(test)
-test_glob_dot_literal :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match(".env", ".env", false))
-	testing.expect(t, glob_match(".env", "dir/.env", false))
-	testing.expect(t, !glob_match(".env", "env", false))
-	testing.expect(t, !glob_match(".env", "x.env", false))
-}
-
-@(test)
-test_glob_globstar_prefix :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("**/foo", "foo", false))
-	testing.expect(t, glob_match("**/foo", "a/b/foo", false))
-	testing.expect(t, !glob_match("**/foo", "foobar", false))
-	testing.expect(t, !glob_match("**/foo", "a/foobar", false))
-}
-
-@(test)
-test_glob_globstar_suffix :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("abc/**", "abc/x", false))
-	testing.expect(t, glob_match("abc/**", "abc/x/y", false))
-	testing.expect(t, !glob_match("abc/**", "abc", false))
-	testing.expect(t, !glob_match("abc/**", "abcd/x", false))
-}
-
-@(test)
-test_glob_globstar_middle :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("foo/**/bar", "foo/bar", false))
-	testing.expect(t, glob_match("foo/**/bar", "foo/x/bar", false))
-	testing.expect(t, !glob_match("foo/**/bar", "foo/barx", false))
-	testing.expect(t, !glob_match("foo/**/bar", "foo/x/y/baz", false))
-}
-
-@(test)
-test_glob_backslash_escape :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("\\!foo", "!foo", false))
-	testing.expect(t, !glob_match("\\!foo", "foo", false))
-}
-
-@(test)
-test_glob_hash_literal :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("#foo", "#foo", false))
-	testing.expect(t, !glob_match("#foo", "foo", false))
-}
-
-@(test)
-test_glob_hash_pattern :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("#*#", "#test#", false))
-	testing.expect(t, glob_match("#*#", "##", false))
-	testing.expect(t, !glob_match("#*#", "test", false))
-	testing.expect(t, !glob_match("#*#", "#test", false))
-}
-
-@(test)
-test_glob_empty :: proc(t: ^testing.T) {
-	testing.expect(t, glob_match("", "", false))
-	testing.expect(t, !glob_match("", "foo", false))
-}

findr/repos.odin

@@ -1,128 +0,0 @@
-package findr
-
-import "core:strings"
-import "core:sync"
-import "core:sys/linux"
-import "core:thread"
-
-RepoPool :: struct {
-	queue:        [dynamic]string,
-	queue_mutex:  sync.Mutex,
-	queue_sema:   sync.Atomic_Sema,
-	results:      ^[dynamic]string,
-	results_lock: sync.Mutex,
-	active:       i64,
-	done:         sync.One_Shot_Event,
-	threads:      []^thread.Thread,
-}
-
-find_repos :: proc(roots: []string, results: ^[dynamic]string, thread_count: int) {
-	if len(roots) == 0 do return
-
-	pool := new(RepoPool)
-	pool.queue = make([dynamic]string)
-	pool.results = results
-	pool.active = i64(len(roots))
-	pool.threads = make([]^thread.Thread, thread_count)
-
-	for root in roots {
-		root_clone, _ := strings.clone(root)
-		append(&pool.queue, root_clone)
-		sync.atomic_sema_post(&pool.queue_sema)
-	}
-
-	for i in 0 ..< thread_count {
-		t := thread.create(repo_worker)
-		t.data = rawptr(pool)
-		t.init_context = context
-		thread.start(t)
-		pool.threads[i] = t
-	}
-
-	sync.one_shot_event_wait(&pool.done)
-
-	for _ in 0 ..< thread_count {
-		sync.atomic_sema_post(&pool.queue_sema)
-	}
-
-	for t in pool.threads {
-		thread.destroy(t)
-	}
-	delete(pool.threads)
-
-	for path in pool.queue {
-		delete(path)
-	}
-	delete(pool.queue)
-
-	free(pool)
-}
-
-repo_worker :: proc(t: ^thread.Thread) {
-	pool := cast(^RepoPool)t.data
-
-	for {
-		sync.atomic_sema_wait(&pool.queue_sema)
-
-		sync.mutex_lock(&pool.queue_mutex)
-		if len(pool.queue) == 0 {
-			sync.mutex_unlock(&pool.queue_mutex)
-			if sync.atomic_load_explicit(&pool.active, .Acquire) == 0 {
-				sync.one_shot_event_signal(&pool.done)
-			}
-			break
-		}
-		last := len(pool.queue) - 1
-		dir_path := pool.queue[last]
-		ordered_remove(&pool.queue, last)
-		sync.mutex_unlock(&pool.queue_mutex)
-
-		process_repo_dir(pool, dir_path)
-		delete(dir_path)
-
-		old := sync.atomic_sub_explicit(&pool.active, 1, .Release)
-		if old == 1 {
-			sync.one_shot_event_signal(&pool.done)
-		}
-	}
-}
-
-process_repo_dir :: proc(pool: ^RepoPool, dir_path: string) {
-	cpath := strings.clone_to_cstring(dir_path)
-	if cpath == nil do return
-	defer delete(cpath)
-
-	fd, open_err := linux.open(cpath, {.DIRECTORY, .CLOEXEC})
-	if open_err != .NONE do return
-	defer linux.close(fd)
-
-	if has_git_dir(fd) {
-		cloned, _ := strings.clone(dir_path)
-		sync.mutex_lock(&pool.results_lock)
-		append(pool.results, cloned)
-		sync.mutex_unlock(&pool.results_lock)
-	}
-
-	buf: [32 * 1024]u8
-
-	for {
-		n, errno := linux.getdents(fd, buf[:])
-		if n <= 0 || errno != .NONE do break
-
-		offs := 0
-		for d in linux.dirent_iterate_buf(buf[:n], &offs) {
-			name := linux.dirent_name(d)
-			if name == "." || name == ".." do continue
-			if name == ".git" do continue
-
-			if d.type == .DIR {
-				child_path := join_path(dir_path, name)
-				sync.atomic_add_explicit(&pool.active, 1, .Relaxed)
-				sync.mutex_lock(&pool.queue_mutex)
-				append(&pool.queue, child_path)
-				sync.mutex_unlock(&pool.queue_mutex)
-				sync.atomic_sema_post(&pool.queue_sema)
-			}
-		}
-	}
-}

findr/test_env.odin

@@ -61,24 +61,23 @@ create_git_repo :: proc(env: TestEnv, path: string) {
 }
 
 assert_output :: proc(
-	t: ^testing.T,
+	t:        ^testing.T,
-	env: TestEnv,
+	env:      TestEnv,
-	args: []string,
+	args:     []string,
-	opts: WalkOptions,
 	expected: []string,
 ) {
-	results := collect_results(env, args, opts)
+	results := collect_results(env, args)
 	defer {
-		for r in results {delete(r)}
+		for r in results { delete(r) }
 		delete(results)
 	}
 
 	sorted_expected := make([dynamic]string, 0, len(expected))
-	for e in expected {append(&sorted_expected, e)}
+	for e in expected { append(&sorted_expected, e) }
 	defer delete(sorted_expected)
 
 	sorted_actual := make([dynamic]string, 0, len(results))
-	for a in results {append(&sorted_actual, a)}
+	for a in results { append(&sorted_actual, a) }
 	defer delete(sorted_actual)
 
 	sort.quick_sort(sorted_expected[:])
@@ -94,7 +93,7 @@ assert_output :: proc(
 		return
 	}
 
-	for i in 0 ..< len(sorted_expected) {
+	for i in 0..<len(sorted_expected) {
 		if sorted_expected[i] != sorted_actual[i] {
 			testing.fail(t)
 			log.error(fmt.tprintf("Mismatch at index %d", i))
@@ -105,15 +104,10 @@ assert_output :: proc(
 	}
 }
 
-assert_output_empty :: proc(
+assert_output_empty :: proc(t: ^testing.T, env: TestEnv, args: []string) {
-	t: ^testing.T,
+	results := collect_results(env, args)
-	env: TestEnv,
-	args: []string,
-	opts: WalkOptions,
-) {
-	results := collect_results(env, args, opts)
 	defer {
-		for r in results {delete(r)}
+		for r in results { delete(r) }
 		delete(results)
 	}
 	if len(results) > 0 {
@@ -125,17 +119,18 @@ assert_output_empty :: proc(
 	}
 }
 
-collect_results :: proc(env: TestEnv, args: []string, opts: WalkOptions) -> [dynamic]string {
+collect_results :: proc(env: TestEnv, args: []string) -> [dynamic]string {
 	results := make([dynamic]string)
 
 	full_args := make([dynamic]string, 0, len(args) + 1, context.temp_allocator)
 	append(&full_args, env.temp_dir)
-	for a in args {append(&full_args, a)}
+	for a in args { append(&full_args, a) }
 
-	thread_count := os.get_processor_core_count()
+	for dir in full_args {
-	walk(full_args[:], &results, opts, thread_count)
+		walk(dir, &results)
+	}
 
-	for i in 0 ..< len(results) {
+	for i in 0..<len(results) {
 		r := results[i]
 		if strings.has_prefix(r, env.temp_dir) {
 			stripped := r[len(env.temp_dir):]

findr/walker.odin

@@ -4,446 +4,257 @@ import "core:fmt"
 import "core:os"
 import "core:strings"
 import "core:sync"
-import "core:sync/chan"
 import "core:sys/linux"
-import "core:text/regex"
 import "core:thread"
 
-OUTPUT_BUF_SIZE :: 64 * 1024
+FINDR_PARALLEL :: #config(FINDR_PARALLEL, false)
+FINDR_THREADS  :: #config(FINDR_THREADS, 8)
 
-WalkOptions :: struct {
+RawEntry :: struct {
-	pattern:  string, // regex on basename; "" = match all
+	name: string,
-	excludes: []string, // glob patterns to skip entirely
+	type: linux.Dirent_Type,
 }
 
-GIContext :: struct {
+walk :: proc(root: string, results: ^[dynamic]string) {
-	gi:       ^Gitignore, // nil if this dir had no .gitignore
+    when FINDR_PARALLEL {
-	base_rel: string, // relative path from repo root to this dir
+        walk_parallel(root, results)
-	parent:   ^GIContext, // parent context (nil if repo root)
+    } else {
+        walk_dir_serial(root, results)
+    }
 }
 
-WorkItem :: struct {
+read_dir_entries :: proc(dir_path: string, has_git: ^bool) -> [dynamic]RawEntry {
-	path:       string, // absolute directory path
+    entries := make([dynamic]RawEntry)
-	rel:        string, // relative path from repo root ("" = root)
+
-	gi_ctx:     ^GIContext, // gitignore chain (nil = outside any repo)
+    cpath := strings.clone_to_cstring(dir_path)
-	in_repo:    bool, // true if inside a git repo
+    if cpath == nil do return entries
-	in_ignored: bool, // true if inside a gitignored directory
+
+    fd, err := linux.open(cpath, {.DIRECTORY, .CLOEXEC})
+    delete(cpath)
+    if err != .NONE do return entries
+
+    buf: [8192]u8
+    has_git^ = false
+
+    for {
+        n, errno := linux.getdents(fd, buf[:])
+        if n <= 0 || errno != .NONE do break
+
+        offs := 0
+        for d in linux.dirent_iterate_buf(buf[:n], &offs) {
+            name := linux.dirent_name(d)
+            if name == "." || name == ".." do continue
+
+            if name == ".git" && d.type == .DIR {
+                has_git^ = true
+            }
+
+            cloned := strings.clone(name)
+            append(&entries, RawEntry{name = cloned, type = d.type})
+        }
+    }
+
+    linux.close(fd)
+    return entries
 }
 
-WalkerPool :: struct {
+free_entries :: proc(entries: ^[dynamic]RawEntry) {
-	queue:         [dynamic]WorkItem,
+    for &entry in entries {
-	queue_mutex:   sync.Mutex,
+        delete(entry.name)
-	queue_sema:    sync.Atomic_Sema,
+    }
-	result_chan:   chan.Chan([]u8),
+    delete(entries^)
-	active:        i64,
-	done:          sync.One_Shot_Event,
-	threads:       []^thread.Thread,
-	opts:          WalkOptions,
-	pattern_re:    regex.Regular_Expression,
-	has_pattern:   bool,
-	exclude_gi:    ^Gitignore,
-	all_contexts:  [dynamic]^GIContext,
-	contexts_lock: sync.Mutex,
 }
 
-Collector_Data :: struct {
+walk_dir_serial :: proc(dir_path: string, results: ^[dynamic]string) {
-	ch:      chan.Chan([]u8),
+    has_git := false
-	results: ^[dynamic]string,
+    entries := read_dir_entries(dir_path, &has_git)
+    defer free_entries(&entries)
+
+    if has_git {
+        gi := load_gitignore(dir_path)
+        defer if gi != nil {
+            destroy(gi)
+            free(gi)
+        }
+
+        for entry in entries {
+            if entry.name == ".git" do continue
+            is_dir := entry.type == .DIR
+            if gi != nil && is_ignored(gi, entry.name, is_dir) {
+                if !is_dir {
+                    full_path := join_path(dir_path, entry.name)
+                    append(results, full_path)
+                }
+                continue
+            }
+            if is_dir {
+                child_path := join_path(dir_path, entry.name)
+                walk_dir_serial(child_path, results)
+                delete(child_path)
+            }
+        }
+    } else {
+        for entry in entries {
+            if entry.type == .DIR {
+                child_path := join_path(dir_path, entry.name)
+                walk_dir_serial(child_path, results)
+                delete(child_path)
+            }
+        }
+    }
 }
 
-collect_worker :: proc(t: ^thread.Thread) {
+load_gitignore :: proc(dir_path: string) -> ^Gitignore {
-	data := cast(^Collector_Data)t.data
+    gi_path := join_path(dir_path, ".gitignore")
-	for {
+    defer delete(gi_path)
-		batch, ok := chan.recv(data.ch)
-		if !ok do break
-		start := 0
-		for i in 0 ..< len(batch) {
-			if batch[i] == '\n' {
-				if i > start {
-					s, _ := strings.clone(string(batch[start:i]))
-					append(data.results, s)
-				}
-				start = i + 1
-			}
-		}
-		delete(batch)
-	}
-}
 
-walk :: proc(roots: []string, results: ^[dynamic]string, opts: WalkOptions, thread_count: int) {
+    data, err := os.read_entire_file_from_path(gi_path, context.allocator)
-	if len(roots) == 0 do return
+    if err != nil do return nil
 
-	ch, _ := chan.create(chan.Chan([]u8), max(2 * thread_count, 2), context.allocator)
+    gi := new(Gitignore)
-	defer chan.destroy(ch)
+    gi^ = parse(string(data))
-
+    delete(data)
-	data := new(Collector_Data)
+    return gi
-	data.ch = ch
-	data.results = results
-	defer free(data)
-
-	collector := thread.create(collect_worker)
-	collector.data = rawptr(data)
-	collector.init_context = context
-	thread.start(collector)
-
-	pool := new(WalkerPool)
-	pool.queue = make([dynamic]WorkItem)
-	pool.result_chan = ch
-	pool.active = i64(len(roots))
-	pool.threads = make([]^thread.Thread, thread_count)
-	pool.all_contexts = make([dynamic]^GIContext)
-	pool.opts = opts
-	pool.exclude_gi = nil
-	pool.has_pattern = false
-
-	if len(opts.pattern) > 0 {
-		re, err := regex.create(opts.pattern, {regex.Flag.No_Capture})
-		if err == nil {
-			pool.pattern_re = re
-			pool.has_pattern = true
-		}
-	}
-
-	if len(opts.excludes) > 0 {
-		sb: strings.Builder
-		strings.builder_init(&sb)
-		for ex in opts.excludes {
-			fmt.sbprintf(&sb, "%s\n", ex)
-		}
-		content := strings.to_string(sb)
-		pool.exclude_gi = new(Gitignore)
-		pool.exclude_gi^ = parse(content)
-		strings.builder_destroy(&sb)
-	}
-
-	for root in roots {
-		root_clone, _ := strings.clone(root)
-		append(&pool.queue, WorkItem{path = root_clone})
-		sync.atomic_sema_post(&pool.queue_sema)
-	}
-
-	for i in 0 ..< thread_count {
-		t := thread.create(walk_worker)
-		t.data = rawptr(pool)
-		t.init_context = context
-		thread.start(t)
-		pool.threads[i] = t
-	}
-
-	sync.one_shot_event_wait(&pool.done)
-
-	for _ in 0 ..< thread_count {
-		sync.atomic_sema_post(&pool.queue_sema)
-	}
-
-	for t in pool.threads {
-		thread.destroy(t)
-	}
-	delete(pool.threads)
-	for item in pool.queue {
-		delete(item.path)
-		if len(item.rel) > 0 {delete(item.rel)}
-	}
-	delete(pool.queue)
-
-	for ctx in pool.all_contexts {
-		if ctx.gi != nil {
-			destroy(ctx.gi)
-			free(ctx.gi)
-		}
-		if len(ctx.base_rel) > 0 {
-			delete(ctx.base_rel)
-		}
-		free(ctx)
-	}
-	delete(pool.all_contexts)
-
-	if pool.has_pattern {
-		regex.destroy(pool.pattern_re)
-	}
-	if pool.exclude_gi != nil {
-		destroy(pool.exclude_gi)
-		free(pool.exclude_gi)
-	}
-
-	free(pool)
-
-	chan.close(ch)
-	thread.join(collector)
-	thread.destroy(collector)
-}
-
-flush_buf :: proc(ch: chan.Chan([]u8), local: ^[dynamic]u8) {
-	if len(local) == 0 do return
-	batch := local[:]
-	local^ = make([dynamic]u8, 0, OUTPUT_BUF_SIZE)
-	chan.send(ch, batch)
-}
-
-append_path :: proc(buf: ^[dynamic]u8, parent, name: string, trailing_slash: bool) {
-	need_sep := len(parent) > 0 && parent[len(parent) - 1] != '/'
-	size := len(parent) + len(name) + 1
-	if need_sep do size += 1
-	if trailing_slash do size += 1
-
-	old_len := len(buf)
-	reserve(buf, old_len + size)
-	resize(buf, old_len + size)
-
-	pos := old_len
-	pos += copy(buf[pos:], parent)
-	if need_sep {buf[pos] = '/'; pos += 1}
-	pos += copy(buf[pos:], name)
-	if trailing_slash {buf[pos] = '/'; pos += 1}
-	buf[pos] = '\n'
-}
-
-walk_worker :: proc(t: ^thread.Thread) {
-	pool := cast(^WalkerPool)t.data
-
-	local_buf := make([dynamic]u8, 0, OUTPUT_BUF_SIZE)
-	defer {
-		if len(local_buf) > 0 {
-			flush_buf(pool.result_chan, &local_buf)
-		}
-		delete(local_buf)
-	}
-
-	for {
-		sync.atomic_sema_wait(&pool.queue_sema)
-
-		sync.mutex_lock(&pool.queue_mutex)
-		if len(pool.queue) == 0 {
-			sync.mutex_unlock(&pool.queue_mutex)
-			if sync.atomic_load_explicit(&pool.active, .Acquire) == 0 {
-				sync.one_shot_event_signal(&pool.done)
-			}
-			break
-		}
-		last := len(pool.queue) - 1
-		item := pool.queue[last]
-		ordered_remove(&pool.queue, last)
-		sync.mutex_unlock(&pool.queue_mutex)
-
-		process_dir(pool, item, &local_buf)
-		delete(item.path)
-		if len(item.rel) > 0 {delete(item.rel)}
-
-		if len(local_buf) >= OUTPUT_BUF_SIZE {
-			flush_buf(pool.result_chan, &local_buf)
-		}
-
-		old := sync.atomic_sub_explicit(&pool.active, 1, .Release)
-		if old == 1 {
-			sync.one_shot_event_signal(&pool.done)
-		}
-	}
-}
-
-process_dir :: proc(pool: ^WalkerPool, item: WorkItem, local_buf: ^[dynamic]u8) {
-	dir_path := item.path
-
-	cpath := strings.clone_to_cstring(dir_path)
-	if cpath == nil do return
-	defer delete(cpath)
-
-	fd, open_err := linux.open(cpath, {.DIRECTORY, .CLOEXEC})
-	if open_err != .NONE do return
-	defer linux.close(fd)
-
-	has_git := false
-	if !item.in_ignored {
-		has_git = has_git_dir(fd)
-	}
-
-	gi_ctx := item.gi_ctx
-	rel := item.rel
-
-	if has_git {
-		gi_ctx = nil
-		rel = ""
-	}
-
-	child_in_repo := has_git || item.in_repo
-
-	gi: ^Gitignore = nil
-	if !item.in_ignored {
-		gi = load_ignore_patterns(dir_path, child_in_repo)
-	}
-	if gi != nil {
-		new_ctx := new(GIContext)
-		new_ctx.gi = gi
-		if len(rel) > 0 {
-			new_ctx.base_rel, _ = strings.clone(rel)
-		}
-		new_ctx.parent = gi_ctx
-
-		sync.mutex_lock(&pool.contexts_lock)
-		append(&pool.all_contexts, new_ctx)
-		sync.mutex_unlock(&pool.contexts_lock)
-
-		gi_ctx = new_ctx
-	}
-
-	buf: [32 * 1024]u8
-	rel_buf: [4096]u8
-
-	for {
-		n, errno := linux.getdents(fd, buf[:])
-		if n <= 0 || errno != .NONE do break
-
-		offs := 0
-		for d in linux.dirent_iterate_buf(buf[:n], &offs) {
-			name := linux.dirent_name(d)
-			if name == "." || name == ".." do continue
-			if name == ".git" do continue
-
-			is_dir := d.type == .DIR
-			is_nondir := d.type != .DIR
-
-			if pool.exclude_gi != nil && is_ignored(pool.exclude_gi, name, is_dir) {
-				continue
-			}
-
-			entry_rel := build_rel(rel_buf[:], rel, name)
-
-			ignored := false
-			if item.in_ignored {
-				ignored = true
-			} else if gi_ctx != nil {
-				ignored = check_chain(gi_ctx, entry_rel, is_dir)
-			}
-
-			if is_dir {
-				if ignored && matches_pattern(pool, name) {
-					append_path(local_buf, dir_path, name, true)
-				}
-				child_rel, _ := strings.clone(entry_rel)
-				child_path := join_path(dir_path, name)
-				push_work(
-					pool,
-					WorkItem {
-						path = child_path,
-						rel = child_rel,
-						gi_ctx = gi_ctx,
-						in_repo = child_in_repo,
-						in_ignored = ignored,
-					},
-				)
-			} else if is_nondir {
-				if ignored && matches_pattern(pool, name) {
-					append_path(local_buf, dir_path, name, false)
-				}
-			}
-		}
-	}
-}
-
-check_chain :: proc(ctx: ^GIContext, entry_rel: string, is_dir: bool) -> bool {
-	c := ctx
-	for c != nil {
-		if c.gi != nil {
-			rel := relative_to(entry_rel, c.base_rel)
-			match := check_match(c.gi, rel, is_dir)
-			if match != .None {
-				return match == .Ignored
-			}
-		}
-		c = c.parent
-	}
-	return false
-}
-
-relative_to :: proc(entry_rel, base_rel: string) -> string {
-	if len(base_rel) == 0 do return entry_rel
-	prefix_len := len(base_rel)
-	if len(entry_rel) > prefix_len &&
-	   entry_rel[prefix_len] == '/' &&
-	   strings.has_prefix(entry_rel, base_rel) {
-		return entry_rel[prefix_len + 1:]
-	}
-	return entry_rel
-}
-
-build_rel :: proc(buf: []u8, rel, name: string) -> string {
-	if len(rel) == 0 do return name
-	pos := copy(buf, rel)
-	if pos < len(buf) {
-		buf[pos] = '/'
-		pos += 1
-		pos += copy(buf[pos:], name)
-	}
-	return string(buf[:pos])
-}
-
-matches_pattern :: proc(pool: ^WalkerPool, name: string) -> bool {
-	if !pool.has_pattern do return true
-	cap, ok := regex.match(pool.pattern_re, name)
-	regex.destroy(cap)
-	return ok
-}
-
-push_work :: proc(pool: ^WalkerPool, item: WorkItem) {
-	sync.atomic_add_explicit(&pool.active, 1, .Relaxed)
-	sync.mutex_lock(&pool.queue_mutex)
-	append(&pool.queue, item)
-	sync.mutex_unlock(&pool.queue_mutex)
-	sync.atomic_sema_post(&pool.queue_sema)
-}
-
-has_git_dir :: proc(fd: linux.Fd) -> bool {
-	git_fd, err := linux.openat(fd, ".git", {.DIRECTORY, .CLOEXEC})
-	if err == .NONE {
-		linux.close(git_fd)
-		return true
-	}
-	return false
-}
-
-load_ignore_patterns :: proc(dir_path: string, in_repo: bool) -> ^Gitignore {
-	has_patterns := false
-	sb: strings.Builder
-	strings.builder_init(&sb)
-	defer strings.builder_destroy(&sb)
-
-	if in_repo {
-		gi_path := join_path(dir_path, ".gitignore")
-		data, err := os.read_entire_file_from_path(gi_path, context.allocator)
-		delete(gi_path)
-		if err == .NONE {
-			fmt.sbprintf(&sb, "%s", string(data))
-			delete(data)
-			has_patterns = true
-		}
-	}
-
-	ig_path := join_path(dir_path, ".ignore")
-	idata, ierr := os.read_entire_file_from_path(ig_path, context.allocator)
-	delete(ig_path)
-	if ierr == .NONE {
-		fmt.sbprintf(&sb, "%s", string(idata))
-		delete(idata)
-		has_patterns = true
-	}
-
-	if !has_patterns do return nil
-
-	content := strings.to_string(sb)
-	gi := new(Gitignore)
-	gi^ = parse(content)
-	return gi
 }
 
 join_path :: proc(parent, child: string) -> string {
-	need_sep := len(parent) == 0 || parent[len(parent) - 1] != '/'
+    b: strings.Builder
-	total := len(parent) + len(child)
+    strings.builder_init(&b)
-	if need_sep do total += 1
+    defer strings.builder_destroy(&b)
-	buf := make([]u8, total, context.allocator)
+
-	pos := copy(buf, parent)
+    fmt.sbprintf(&b, "%s", parent)
-	if need_sep {
+    if len(parent) == 0 || parent[len(parent) - 1] != '/' {
-		buf[pos] = '/'
+        fmt.sbprintf(&b, "/")
-		pos += 1
+    }
-	}
+    fmt.sbprintf(&b, "%s", child)
-	copy(buf[pos:], child)
+
-	return string(buf)
+    s := strings.to_string(b)
+    result, _ := strings.clone(s)
+    return result
+}
+
+when FINDR_PARALLEL {
+    WalkerPool :: struct {
+        queue: [dynamic]string,
+        queue_mutex: sync.Mutex,
+        queue_sema: sync.Atomic_Sema,
+        results: ^[dynamic]string,
+        results_mutex: sync.Mutex,
+        active: i64,
+        done: sync.One_Shot_Event,
+        threads: [dynamic]^thread.Thread,
+    }
+
+    walk_parallel :: proc(root: string, results: ^[dynamic]string) {
+        pool := new(WalkerPool)
+        pool.queue = make([dynamic]string)
+        pool.results = results
+        pool.active = 1
+        pool.threads = make([dynamic]^thread.Thread)
+
+        root_clone, _ := strings.clone(root)
+        append(&pool.queue, root_clone)
+        sync.atomic_sema_post(&pool.queue_sema)
+
+        num_threads := FINDR_THREADS
+        for i in 0..<num_threads {
+            t := thread.create(walk_worker)
+            t.data = rawptr(pool)
+            t.init_context = context
+            thread.start(t)
+            append(&pool.threads, t)
+        }
+
+        sync.one_shot_event_wait(&pool.done)
+
+        for _ in 0..<num_threads {
+            sync.atomic_sema_post(&pool.queue_sema)
+        }
+
+        for t in pool.threads {
+            thread.destroy(t)
+        }
+        delete(pool.threads)
+        for path in pool.queue {
+            delete(path)
+        }
+        delete(pool.queue)
+        free(pool)
+    }
+
+    push_work :: proc(pool: ^WalkerPool, path: string) {
+        sync.atomic_add_explicit(&pool.active, 1, .Relaxed)
+        sync.mutex_lock(&pool.queue_mutex)
+        append(&pool.queue, path)
+        sync.mutex_unlock(&pool.queue_mutex)
+        sync.atomic_sema_post(&pool.queue_sema)
+    }
+
+    process_dir_parallel :: proc(pool: ^WalkerPool, dir_path: string) {
+        has_git := false
+        entries := read_dir_entries(dir_path, &has_git)
+        defer free_entries(&entries)
+
+        if has_git {
+            gi := load_gitignore(dir_path)
+            defer if gi != nil {
+                destroy(gi)
+                free(gi)
+            }
+
+            for entry in entries {
+                if entry.name == ".git" do continue
+                is_dir := entry.type == .DIR
+                if gi != nil && is_ignored(gi, entry.name, is_dir) {
+                    if !is_dir {
+                        full_path := join_path(dir_path, entry.name)
+                        sync.mutex_lock(&pool.results_mutex)
+                        append(pool.results, full_path)
+                        sync.mutex_unlock(&pool.results_mutex)
+                    }
+                    continue
+                }
+                if is_dir {
+                    child_path := join_path(dir_path, entry.name)
+                    push_work(pool, child_path)
+                }
+            }
+        } else {
+            for entry in entries {
+                if entry.type == .DIR {
+                    child_path := join_path(dir_path, entry.name)
+                    push_work(pool, child_path)
+                }
+            }
+        }
+    }
+
+    walk_worker :: proc(t: ^thread.Thread) {
+        pool := cast(^WalkerPool) t.data
+
+        for {
+            sync.atomic_sema_wait(&pool.queue_sema)
+
+            sync.mutex_lock(&pool.queue_mutex)
+            if len(pool.queue) == 0 {
+                sync.mutex_unlock(&pool.queue_mutex)
+                if sync.atomic_load_explicit(&pool.active, .Acquire) == 0 {
+                    sync.one_shot_event_signal(&pool.done)
+                }
+                break
+            }
+            last := len(pool.queue) - 1
+            dir_path := pool.queue[last]
+            ordered_remove(&pool.queue, last)
+            sync.mutex_unlock(&pool.queue_mutex)
+
+            process_dir_parallel(pool, dir_path)
+            delete(dir_path)
+
+            old := sync.atomic_sub_explicit(&pool.active, 1, .Release)
+            if old == 1 {
+                sync.one_shot_event_signal(&pool.done)
+            }
+        }
+    }
 }

flake.nix

@@ -95,6 +95,7 @@
 
           devShells.default = pkgs.mkShell {
             buildInputs = with pkgs; [
+              fd
               nushell
 
               libsodium
@@ -106,7 +107,6 @@
               zip
 
               # Helper tools
-              delta
               hyperfine
 
               # IDE

scan.odin

@@ -1,21 +1,137 @@
 package main
 
+import "core:fmt"
 import "core:os"
+import "core:strings"
+import "core:sync"
+import "core:terminal"
 
-import "findr"
+fd_counter: sync.Atomic_Mutex
+fd_seq: int
 
 // Caller is responsible for freeing paths
 scan_path :: proc(search_path: string, cfg: Config) -> (paths: [dynamic]string, ok: bool) {
-	opts := findr.WalkOptions {
+	if terminal.is_terminal(os.stdout) {
-		pattern  = cfg.ScanConfig.Matcher,
+		fmt.printf("Searching for all files in \"%s\"...\n", search_path)
-		excludes = cfg.ScanConfig.Exclude[:],
 	}
-	findr.walk({search_path}, &paths, opts, os.get_processor_core_count())
+	all_files, all_ok := run_fd(build_fd_args(search_path, cfg, true))
+	if !all_ok {
+		return
+	}
+
+	if terminal.is_terminal(os.stdout) {
+		fmt.printf("Search for unignored fies in \"%s\"...\n", search_path)
+	}
+	unignored_files, unignored_ok := run_fd(build_fd_args(search_path, cfg, false))
+	if !unignored_ok {
+		return
+	}
+
+	unignored_set := make(map[string]bool, len(unignored_files), context.temp_allocator)
+	for file in unignored_files {
+		unignored_set[file] = true
+	}
+
+	for file in all_files {
+		if !(file in unignored_set) {
+			append(&paths, file)
+		}
+	}
+
 	ok = true
 	return
 }
 
+@(private = "file")
+build_fd_args :: proc(search_path: string, cfg: Config, include_ignored: bool) -> []string {
+	args_len := 3 + 2 * len(cfg.ScanConfig.Exclude) + 2
+	args := make([dynamic]string, 0, args_len, context.temp_allocator)
+	append(&args, "fd")
+	append(&args, "-a")
+	append(&args, cfg.ScanConfig.Matcher)
+
+	for exclude in cfg.ScanConfig.Exclude {
+		append(&args, "-E")
+		append(&args, exclude)
+	}
+
+	if include_ignored {
+		append(&args, "-HI")
+	} else {
+		append(&args, "-H")
+	}
+
+	append(&args, search_path)
+	return args[:]
+}
+
+run_fd :: proc(args: []string) -> (lines: []string, ok: bool) {
+	tmp_path := next_fd_tmp_path()
+	tmp_file, tmp_err := os.open(tmp_path, os.O_CREATE | os.O_WRONLY | os.O_TRUNC)
+	if tmp_err != nil {
+		// TODO: Log a message here
+		return
+	}
+
+	desc := os.Process_Desc {
+		command = args,
+		stdout  = tmp_file,
+		stderr  = nil,
+	}
+
+	p, start_err := os.process_start(desc)
+	os.close(tmp_file)
+	if start_err != nil {
+		os.remove(tmp_path)
+		return
+	}
+
+	state, wait_err := os.process_wait(p)
+	if wait_err != nil || state.exit_code != 0 {
+		os.remove(tmp_path)
+		return
+	}
+
+	data, read_err := os.read_entire_file_from_path(tmp_path, context.temp_allocator)
+	os.remove(tmp_path)
+	if read_err != nil {
+		return
+	}
+
+	output := string(data)
+	output = strings.trim_space(output)
+	if len(output) == 0 {
+		ok = true
+		return
+	}
+
+	raw_lines := strings.split(output, "\n", context.temp_allocator)
+	result := make([dynamic]string, 0, len(raw_lines), context.temp_allocator)
+	for line in raw_lines {
+		trimmed := strings.trim_space(line)
+		if len(trimmed) > 0 {
+			append(&result, trimmed)
+		}
+	}
+
+	return result[:], true
+}
+
+@(private = "file")
+next_fd_tmp_path :: proc() -> string {
+	sync.atomic_mutex_lock(&fd_counter)
+	n := fd_seq
+	fd_seq += 1
+	sync.atomic_mutex_unlock(&fd_counter)
+	return fmt.tprintf("/tmp/envr-fd-%d-%d", os.get_pid(), n)
+}
+
+cant_scan :: proc(feats: AvailableFeatures) -> bool {
+	return Feature.Fd not_in feats
+}
+
 find_unbacked :: proc(local_files: []string, db_files: []EnvFile) -> []string {
+	// Lives until the end of the function
 	backed_set := make(map[string]bool, len(db_files), context.temp_allocator)
 	for file in db_files {
 		backed_set[file.Path] = true
@@ -29,3 +145,4 @@ find_unbacked :: proc(local_files: []string, db_files: []EnvFile) -> []string {
 	}
 	return unbacked[:]
 }
+

scan_test.odin

@@ -3,10 +3,14 @@ package main
 import "core:fmt"
 import "core:os"
 import "core:path/filepath"
+import "core:strings"
 import "core:testing"
 
 @(test)
 test_scan_path_finds_gitignored_env_files :: proc(t: ^testing.T) {
+	feats := check_features()
+	testing.expect(t, cant_scan(feats) == false)
+
 	base := fmt.tprintf("/tmp/envr-scan-test-%d", os.get_pid())
 	os.mkdir_all(base)
 	defer os.remove_all(base)
@@ -38,12 +42,7 @@ test_scan_path_finds_gitignored_env_files :: proc(t: ^testing.T) {
 	}
 
 	results, ok := scan_path(base, cfg)
-	defer {
+	defer delete(results)
-		for path in results {
-			delete(path)
-		}
-		delete(results)
-	}
 	testing.expect(t, ok, "scan_path should succeed")
 
 	found_env := false
@@ -70,6 +69,9 @@ test_scan_path_finds_gitignored_env_files :: proc(t: ^testing.T) {
 
 @(test)
 test_scan_path_empty_dir :: proc(t: ^testing.T) {
+	feats := check_features()
+	testing.expect(t, cant_scan(feats) == false)
+
 	base := fmt.tprintf("/tmp/envr-scan-empty-%d", os.get_pid())
 	os.mkdir_all(base)
 	defer os.remove_all(base)
@@ -83,3 +85,12 @@ test_scan_path_empty_dir :: proc(t: ^testing.T) {
 	testing.expect(t, ok, "scan_path should succeed")
 	testing.expect(t, len(results) == 0, fmt.tprintf("expected 0 results, got %d", len(results)))
 }
+
+@(test)
+test_scan_meets_expectations :: proc(t: ^testing.T) {
+	testing.expect(t, cant_scan({}), "no features should mean can't scan")
+	testing.expect(t, cant_scan({.Git}), "Git alone should mean can't scan")
+	testing.expect(t, !cant_scan({.Fd}), "having Fd should mean can scan")
+	testing.expect(t, !cant_scan({.Fd, .Git}), "both Fd and Git should mean can scan")
+}
+

version.txt

@@ -1 +1 @@
-0.3.0
+0.4.0