cli/list-fonts: flags, help

src/cli/list_fonts.zig

@@ -10,12 +10,39 @@ pub const Config = struct {
     /// This is set by the CLI parser for deinit.
     _arena: ?ArenaAllocator = null,
 
+    /// The font family to search for. If this is set, then only fonts
+    /// matching this family will be listed.
+    family: ?[:0]const u8 = null,
+
+    /// Font styles to search for. If this is set, then only fonts that
+    /// match the given styles will be listed.
+    bold: bool = false,
+    italic: bool = false,
+
     pub fn deinit(self: *Config) void {
         if (self._arena) |arena| arena.deinit();
         self.* = undefined;
     }
 };
 
+/// The list-fonts command is used to list all the available fonts for Ghostty.
+/// This uses the exact same font discovery mechanism Ghostty uses to find
+/// fonts to use.
+///
+/// When executed with no arguments, this will list all available fonts,
+/// sorted by family name, then font name. If a family name is given
+/// with "--family", the sorting will be disabled and the results instead
+/// will be shown in the same priority order Ghostty would use to pick a
+/// font.
+///
+/// The "--family" argument can be used to filter results to a specific family.
+/// The family handling is identical to the "font-familiy" set of Ghostty
+/// configuration values, so this can be used to debug why your desired font
+/// may not be loading.
+///
+/// The "--bold" and "--italic" arguments can be used to filter results to
+/// specific styles. It is not guaranteed that only those styles are returned,
+/// it will just prioriiize fonts that match those styles.
 pub fn run(alloc: Allocator) !u8 {
     var iter = try std.process.argsWithAllocator(alloc);
     defer iter.deinit();
@@ -55,7 +82,11 @@ fn runArgs(alloc_gpa: Allocator, argsIter: anytype) !u8 {
     // Look up all available fonts
     var disco = font.Discover.init();
     defer disco.deinit();
-    var disco_it = try disco.discover(.{});
+    var disco_it = try disco.discover(.{
+        .family = config.family,
+        .bold = config.bold,
+        .italic = config.italic,
+    });
     defer disco_it.deinit();
     while (try disco_it.next()) |face| {
         var buf: [1024]u8 = undefined;
@@ -81,21 +112,25 @@ fn runArgs(alloc_gpa: Allocator, argsIter: anytype) !u8 {
     }
 
     // Sort our keys.
-    std.mem.sortUnstable([]const u8, families.items, {}, struct {
+    if (config.family == null) {
-        fn lessThan(_: void, lhs: []const u8, rhs: []const u8) bool {
+        std.mem.sortUnstable([]const u8, families.items, {}, struct {
-            return std.mem.order(u8, lhs, rhs) == .lt;
+            fn lessThan(_: void, lhs: []const u8, rhs: []const u8) bool {
-        }
+                return std.mem.order(u8, lhs, rhs) == .lt;
-    }.lessThan);
+            }
+        }.lessThan);
+    }
 
     // Output each
     for (families.items) |family| {
         const list = map.get(family) orelse continue;
         if (list.items.len == 0) continue;
-        std.mem.sortUnstable([]const u8, list.items, {}, struct {
+        if (config.family == null) {
-            fn lessThan(_: void, lhs: []const u8, rhs: []const u8) bool {
+            std.mem.sortUnstable([]const u8, list.items, {}, struct {
-                return std.mem.order(u8, lhs, rhs) == .lt;
+                fn lessThan(_: void, lhs: []const u8, rhs: []const u8) bool {
-            }
+                    return std.mem.order(u8, lhs, rhs) == .lt;
-        }.lessThan);
+                }
+            }.lessThan);
+        }
 
         try stdout.print("{s}\n", .{family});
         for (list.items) |item| try stdout.print("  {s}\n", .{item});