feat(comma): Added enum value for unknown commands.

src/comma.zig

@@ -27,10 +27,11 @@ pub const Command = struct {
         };
     }
 
-    pub fn parse(comptime self: @This(), args: []const []const u8) ParseError!self.Type {
+    pub fn parse(comptime self: @This(), args: []const []const u8) self.Type {
         if (args.len == 0) {
-            return ParseError.InvalidType;
+            return @enumFromInt(0);
         }
+
         const target = args[0];
 
         inline for (self.subcommands, 1..) |cmd, idx| {
@@ -39,7 +40,7 @@ pub const Command = struct {
             }
         }
 
-        return @enumFromInt(0);
+        return @enumFromInt(self.subcommands.len + 1);
     }
 };
 
@@ -54,8 +55,8 @@ const CommandOptions = struct {
     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;
+        var field_names: [self.subcommands.len + 2][]const u8 = undefined;
+        var field_values: [self.subcommands.len + 2]u32 = undefined;
 
         field_names[0] = self.name;
         field_values[0] = 0;
@@ -65,6 +66,9 @@ const CommandOptions = struct {
             field_values[idx] = idx;
         }
 
+        field_names[self.subcommands.len + 1] = "unknown";
+        field_values[self.subcommands.len + 1] = self.subcommands.len + 1;
+
         return @Enum(
             u32,
             .exhaustive,

src/main.zig

@@ -14,20 +14,20 @@ pub fn main(init: std.process.Init) !void {
 
     const args = try init.minimal.args.toSlice(arena);
 
-    try run(init.io, init.environ_map, args); //catch return fallback_to_go(init.io, arena, args);
+    try run(init.environ_map, init.io, arena, args);
 }
 
 /// Attempt to run the requested command.
 fn run(
-    io: Io,
     environ_map: *std.process.Environ.Map,
+    io: Io,
+    arena: std.mem.Allocator,
     args: []const [:0]const u8,
 ) !void {
-    const cmd = try envr.root.parse(args[1..]);
+    const cmd = envr.root.parse(args[1..]);
     switch (cmd) {
-        .envr => {
-            // TODO: Print help
-            return comma.ParseError.InvalidType;
+        .envr, .unknown => {
+            return fallback_to_go(io, arena, args);
         },
         .version => {
             var stdout_buffer: [1024]u8 = undefined;

src/root.zig

@@ -11,16 +11,18 @@ pub const root: Command = .new(.{
         .{
             .name = "deps",
             .short = "Check for missing binaries",
-            .long = \\envr relies on external binaries for certain functionality.
-                    \\
-                    \\ The deps command reports which binaries are available and which are not.",
+            .long =
+            \\envr relies on external binaries for certain functionality.
+            \\
+            \\ The deps command reports which binaries are available and which are not."
+            ,
         },
         .{ .name = "version" },
     },
 });
 
 test "enum type" {
-    const got: root.Type = @enumFromInt(1);
+    const got: root.Type = @enumFromInt(2);
 
     try std.testing.expectEqual(.version, got);
 }
@@ -31,3 +33,10 @@ test "parse version" {
 
     try std.testing.expectEqual(.version, cmd);
 }
+
+test "parse unknown" {
+    const args = &[_][]const u8{"bad", "value"};
+    const cmd = root.parse(args);
+
+    try std.testing.expectEqual(.unknown, cmd);
+}