refactor: Broke comma into a separate package.

src/comma.zig

@@ -0,0 +1,75 @@
+//! By convention, root.zig is the root source file when making a package.
+const std = @import("std");
+// const Io = std.Io;
+
+pub const Command = struct {
+    name: []const u8,
+    short: ?[]const u8 = null,
+    long: ?[]const u8 = null,
+    subcommands: []const Command = &[0]Command{},
+    Type: type,
+
+    pub fn new(cmd: CommandOptions) Command {
+        const subcommands: [cmd.subcommands.len]Command = blk: {
+            var result: [cmd.subcommands.len]Command = undefined;
+            inline for (cmd.subcommands, 0..) |sub, idx| {
+                result[idx] = new(sub);
+            }
+            break :blk result;
+        };
+
+        return .{
+            .name = cmd.name,
+            .short = cmd.short,
+            .long = cmd.long,
+            .subcommands = &subcommands,
+            .Type = cmd.as_enum(),
+        };
+    }
+
+    pub fn parse(comptime self: @This(), args: []const []const u8) ParseError!self.Type {
+        if (args.len == 0) {
+            return ParseError.InvalidType;
+        }
+        const target = args[0];
+
+        inline for (self.subcommands, 1..) |cmd, idx| {
+            if (std.mem.eql(u8, target, cmd.name)) {
+                return @enumFromInt(idx);
+            }
+        }
+
+        return @enumFromInt(0);
+    }
+};
+
+pub const ParseError = error{
+    InvalidType,
+};
+
+const CommandOptions = struct {
+    name: []const u8,
+    short: ?[]const u8 = null,
+    long: ?[]const u8 = null,
+    subcommands: []const CommandOptions = &[0]CommandOptions{},
+
+    fn as_enum(self: @This()) type {
+        var field_names: [self.subcommands.len + 1][]const u8 = undefined;
+        var field_values: [self.subcommands.len + 1]u32 = undefined;
+
+        field_names[0] = self.name;
+        field_values[0] = 0;
+
+        inline for (self.subcommands, 1..) |cmd, idx| {
+            field_names[idx] = cmd.name;
+            field_values[idx] = idx;
+        }
+
+        return @Enum(
+            u32,
+            .exhaustive,
+            &field_names,
+            &field_values,
+        );
+    }
+};

src/main.zig

@@ -3,6 +3,7 @@ const Io = std.Io;
 
 const config = @import("config");
 
+const comma = @import("comma");
 const envr = @import("envr");
 
 const goBinary = "envr-go";
@@ -22,7 +23,7 @@ fn run(io: Io, args: []const [:0]const u8) !void {
     switch (cmd) {
         .envr => {
             // TODO: Print help
-            return envr.ParseError.InvalidType;
+            return comma.ParseError.InvalidType;
         },
         .version => {
             var stdout_buffer: [1024]u8 = undefined;

src/root.zig

@@ -2,83 +2,14 @@
 const std = @import("std");
 const Io = std.Io;
 
+const comma = @import("comma");
+const Command = comma.Command;
+
 pub const root: Command = .new(.{
     .name = "envr",
-    .subcommands = &[_]CommandOptions{.{ .name = "version" }},
+    .subcommands = &.{.{ .name = "version" }},
 });
 
-const CommandOptions = struct {
-    name: []const u8,
-    short: ?[]const u8 = null,
-    long: ?[]const u8 = null,
-    subcommands: []const CommandOptions = &[0]CommandOptions{},
-
-    fn as_enum(self: @This()) type {
-        var field_names: [self.subcommands.len + 1][]const u8 = undefined;
-        var field_values: [self.subcommands.len + 1]u32 = undefined;
-
-        field_names[0] = self.name;
-        field_values[0] = 0;
-
-        inline for (self.subcommands, 1..) |cmd, idx| {
-            field_names[idx] = cmd.name;
-            field_values[idx] = idx;
-        }
-
-        return @Enum(
-            u32,
-            .exhaustive,
-            &field_names,
-            &field_values,
-        );
-    }
-};
-
-pub const Command = struct {
-    name: []const u8,
-    short: ?[]const u8 = null,
-    long: ?[]const u8 = null,
-    subcommands: []const Command = &[0]Command{},
-    Type: type,
-
-    pub fn new(cmd: CommandOptions) Command {
-        const subcommands: [cmd.subcommands.len]Command = blk: {
-            var result: [cmd.subcommands.len]Command = undefined;
-            inline for (cmd.subcommands, 0..) |sub, idx| {
-                result[idx] = new(sub);
-            }
-            break :blk result;
-        };
-
-        return .{
-            .name = cmd.name,
-            .short = cmd.short,
-            .long = cmd.long,
-            .subcommands = &subcommands,
-            .Type = cmd.as_enum(),
-        };
-    }
-
-    pub fn parse(comptime self: @This(), args: []const []const u8) ParseError!self.Type {
-        if (args.len == 0) {
-            return ParseError.InvalidType;
-        }
-        const target = args[0];
-
-        inline for (self.subcommands, 1..) |cmd, idx| {
-            if (std.mem.eql(u8, target, cmd.name)) {
-                return @enumFromInt(idx);
-            }
-        }
-
-        return @enumFromInt(0);
-    }
-};
-
-pub const ParseError = error{
-    InvalidType,
-};
-
 test "enum type" {
     const got: root.Type = @enumFromInt(1);