bring over the odinfmt code

tools/odinfmt/main.odin

@@ -0,0 +1,140 @@
+package odinfmt
+
+import "core:os"
+import "core:odin/format"
+import "core:fmt"
+import "core:strings"
+import "core:path/filepath"
+
+import "flag"
+
+Args :: struct {
+    write: Maybe(bool) `flag:"w" usage:"write the new format to file"`,
+}
+
+print_help :: proc() {
+
+}
+
+print_arg_error :: proc(error: flag.Flag_Error) {
+    fmt.println(error);
+}
+
+format_file :: proc(filepath: string) -> ([] u8, bool) {
+
+    if data, ok := os.read_entire_file(filepath); ok {
+        return format.format(data, format.default_style);
+    }
+
+    else {
+        return {}, false;
+    }
+
+}
+
+files: [dynamic] string;
+
+walk_files :: proc(info: os.File_Info, in_err: os.Errno) -> (err: os.Errno, skip_dir: bool) {
+
+    if info.is_dir {
+        return 0, false;
+    }
+
+    if filepath.ext(info.name) != ".odin" {
+        return 0, false;
+    }
+
+    append(&files, strings.clone(info.fullpath));
+
+    return 0, false;
+}
+
+main :: proc() {
+
+    args: Args;
+
+    if len(os.args) < 2 {
+        print_help();
+        os.exit(1);
+    }
+
+    if res := flag.parse(args, os.args[1:len(os.args)-1]); res != .None {
+        print_arg_error(res);
+        os.exit(1);
+    }
+
+    path := os.args[len(os.args)-1];
+
+    if os.is_file(path) {
+
+        if _, ok := args.write.(bool); ok {
+
+            backup_path := strings.concatenate({path, "_bk"}, context.temp_allocator);
+
+            if data, ok := format_file(path); ok {
+
+                 os.rename(path, backup_path);
+
+                if os.write_entire_file(path, data) {
+                    os.remove(backup_path);
+                }
+
+            }
+
+            else {
+                fmt.eprintf("failed to write %v", path);
+            }
+
+        }
+
+        else {
+
+            if data, ok := format_file(path); ok {
+                fmt.println(transmute(string)data);
+            }
+
+        }
+
+    }
+
+    else if os.is_dir(path) {
+
+        filepath.walk(path, walk_files);
+
+        for file in files {
+
+            fmt.println(file);
+
+            backup_path := strings.concatenate({file, "_bk"}, context.temp_allocator);
+
+            if data, ok := format_file(file); ok {
+
+                if _, ok := args.write.(bool); ok {
+                    os.rename(file, backup_path);
+
+                    if os.write_entire_file(file, data) {
+                        os.remove(backup_path);
+                    }
+                }
+
+                else {
+                    fmt.println(transmute(string)data);
+                }
+
+
+            }
+
+            free_all(context.temp_allocator);
+        }
+
+        fmt.printf("formatted %v files", len(files));
+
+    }
+
+    else{
+        fmt.eprintf("%v is neither a directory nor a file \n", path);
+        os.exit(1);
+    }
+
+    os.exit(0);
+}