zsh: add completions generation

src/cli/action.zig

@@ -163,6 +163,26 @@ pub const Action = enum {
             return "cli/" ++ filename ++ ".zig";
         }
     }
+
+    /// Returns the options of action. Supports generating shell completions
+    /// without duplicating the mapping from Action to relevant Option
+    /// @import(..) declaration.
+    pub fn options(comptime self: Action) type {
+        comptime {
+            return switch (self) {
+                .version => version.Options,
+                .help => help.Options,
+                .@"list-fonts" => list_fonts.Options,
+                .@"list-keybinds" => list_keybinds.Options,
+                .@"list-themes" => list_themes.Options,
+                .@"list-colors" => list_colors.Options,
+                .@"list-actions" => list_actions.Options,
+                .@"show-config" => show_config.Options,
+                .@"validate-config" => validate_config.Options,
+                .@"crash-report" => crash_report.Options,
+            };
+        }
+    }
 };
 
 test "parse action none" {

src/cli/list_fonts.zig

@@ -7,7 +7,7 @@ const font = @import("../font/main.zig");
 
 const log = std.log.scoped(.list_fonts);
 
-pub const Config = struct {
+pub const Options = struct {
     /// This is set by the CLI parser for deinit.
     _arena: ?ArenaAllocator = null,
 
@@ -23,13 +23,13 @@ pub const Config = struct {
     bold: bool = false,
     italic: bool = false,
 
-    pub fn deinit(self: *Config) void {
+    pub fn deinit(self: *Options) void {
         if (self._arena) |arena| arena.deinit();
         self.* = undefined;
     }
 
     /// Enables "-h" and "--help" to work.
-    pub fn help(self: Config) !void {
+    pub fn help(self: Options) !void {
         _ = self;
         return Action.help_error;
     }
@@ -59,9 +59,9 @@ pub fn run(alloc: Allocator) !u8 {
 }
 
 fn runArgs(alloc_gpa: Allocator, argsIter: anytype) !u8 {
-    var config: Config = .{};
+    var config: Options = .{};
     defer config.deinit();
-    try args.parse(Config, alloc_gpa, &config, argsIter);
+    try args.parse(Options, alloc_gpa, &config, argsIter);
 
     // Use an arena for all our memory allocs
     var arena = ArenaAllocator.init(alloc_gpa);

src/cli/version.zig

@@ -7,6 +7,8 @@ const xev = @import("xev");
 const renderer = @import("../renderer.zig");
 const gtk = if (build_config.app_runtime == .gtk) @import("../apprt/gtk/c.zig").c else void;
 
+pub const Options = struct {};
+
 /// The `version` command is used to display information about Ghostty.
 pub fn run(alloc: Allocator) !u8 {
     _ = alloc;