refactor(odin): Ported scan command.

cmd_scan.odin

@@ -0,0 +1,90 @@
+package main
+
+import "core:encoding/json"
+import "core:fmt"
+
+cmd_scan :: proc(cmd: ^Command) {
+	if !can_scan() {
+		fmt.println(
+			"Error: please install fd to use the scan command (https://github.com/sharkdp/fd)",
+		)
+		return
+	}
+
+	db, db_ok := db_open()
+	if !db_ok {
+		return
+	}
+	defer db_close(&db)
+
+	search_dirs := search_paths(db.cfg)
+	if len(search_dirs) == 0 {
+		fmt.println("No search paths configured. Please run `envr init` or edit your config.")
+		return
+	}
+
+	// TODO: Figure out a sane default
+	all_files: [dynamic]string
+	for dir in search_dirs {
+		found, scan_ok := scan_path(dir, db.cfg)
+		if !scan_ok {
+			fmt.printf("Error scanning %s\n", dir)
+			continue
+		}
+		for f in found {
+			append(&all_files, f)
+		}
+	}
+
+	db_files, list_ok := db_list(&db)
+	if !list_ok {
+		return
+	}
+
+	files := find_unbacked(all_files[:], db_files[:])
+
+	if len(files) == 0 {
+		fmt.println("No .env files found to add.")
+		return
+	}
+
+	if !is_tty() {
+		output, marshal_err := json.marshal(files[:])
+		if marshal_err != nil {
+			fmt.printf("Error marshaling files to JSON: %v\n", marshal_err)
+			return
+		}
+		fmt.println(string(output))
+		return
+	}
+
+	selected, result := multi_select("Select .env files to backup:", files[:])
+	if result == .Cancel {
+		fmt.println("\x1b[2mCancelled.\x1b[0m")
+		return
+	}
+
+	added_count: int
+	for i in 0 ..< len(files) {
+		if !selected[i] {
+			continue
+		}
+		env_file, ok := new_env_file(files[i])
+		if !ok {
+			fmt.printf("Error reading %s\n", files[i])
+			continue
+		}
+		if !db_insert(&db, env_file) {
+			fmt.printf("Error adding %s\n", files[i])
+			continue
+		}
+		added_count += 1
+	}
+
+	if added_count > 0 {
+		fmt.printf("\x1b[1;32mSuccessfully added %d file(s) to backup.\x1b[0m\n", added_count)
+	} else {
+		fmt.println("\x1b[2mNo files were added.\x1b[0m")
+	}
+}
+