From 73c52141468b59d48750ca29c7cc03e859a8eacc Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Sat, 3 Apr 2021 23:20:17 -0300
Subject: [PATCH] add 'help' command

---
 src/main.zig | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/main.zig b/src/main.zig
index d810652..865ce42 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -230,6 +230,13 @@ pub fn doRepl(allocator: *std.mem.Allocator, args_it: anytype) !void {
     }
 }
 
+fn doHelp() void {
+    std.debug.warn("scritcher!\n", .{});
+    std.debug.warn("usage: scritcher [run|help|repl]\n", .{});
+    std.debug.warn("\tscritcher run path_to_script.scri path_to_input_file.bmp\n", .{});
+    std.debug.warn("\tscritcher repl path_to_script.scri path_to_input_file.bmp\n", .{});
+}
+
 pub fn main() !void {
     // const allocator = std.heap.page_allocator;
     var allocator_instance = std.heap.GeneralPurposeAllocator(.{}){};
@@ -248,11 +255,16 @@ pub fn main() !void {
 
     // TODO print help
     _ = args_it.skip();
-    const cli_command = try (args_it.next(allocator) orelse @panic("expected 'run', 'help', or 'repl'"));
+    const cli_command_opt = args_it.next(allocator);
+    if (cli_command_opt == null) {
+        return doHelp();
+    }
+
+    const cli_command = try cli_command_opt.?;
     defer allocator.free(cli_command);
 
     if (std.mem.eql(u8, cli_command, "help")) {
-        //return try doHelp();
+        return doHelp();
     } else if (std.mem.eql(u8, cli_command, "repl")) {
         return try doRepl(allocator, &args_it);
     } else if (std.mem.eql(u8, cli_command, "run")) {
@@ -274,6 +286,7 @@ pub fn main() !void {
 
         try runner.runCommands(cmds, true);
     } else {
-        @panic("expected 'run', 'help', or 'repl'");
+        std.debug.warn("unknown command: '{s}'\n", .{cli_command});
+        return error.UnknownCommand;
     }
 }