feat(cli): add -v and --version flags

* feat(cli): add -v and --version flags
* fix(code): typo
* fix(code): clang-format src/application.c
* docs(swappy.1.scd): add version flags and long names for 'help' and 'file'

meson.build

@@ -1,7 +1,7 @@
 project(
 	'swappy',
 	'c',
-	version: '1.0.0',
+	version: '1.0.1',
 	license: 'MIT',
 	meson_version: '>=0.48.0',
 	default_options: [
@@ -11,6 +11,21 @@ project(
 	],
 )
 
+version = '"@0@"'.format(meson.project_version())
+git = find_program('git', native: true, required: false)
+if git.found()
+	git_commit = run_command([git, 'rev-parse', '--short', 'HEAD'])
+	git_branch = run_command([git, 'rev-parse', '--abbrev-ref', 'HEAD'])
+	if git_commit.returncode() == 0 and git_branch.returncode() == 0
+		version = '"@0@-@1@ (" __DATE__ ", branch \'@2@\')"'.format(
+			meson.project_version(),
+			git_commit.stdout().strip(),
+			git_branch.stdout().strip(),
+		)
+	endif
+endif
+add_project_arguments('-DSWAPPY_VERSION=@0@'.format(version), language: 'c')
+
 add_project_arguments('-Wno-unused-parameter', language: 'c')
 
 swappy_inc = include_directories('include')

src/application.c

@@ -1,6 +1,7 @@
 #include <gdk/gdk.h>
 #include <glib-2.0/glib.h>
 #include <gtk/gtk.h>
+#include <stdio.h>
 #include <time.h>
 
 #include "buffer.h"
@@ -728,7 +729,22 @@ static gint command_line_handler(GtkApplication *app,
   return EXIT_SUCCESS;
 }
 
+// Print version and quit
+gboolean callback_on_flag(const gchar *option_name, const gchar *value,
+                          gpointer data, GError **error) {
+  if (!strcmp(option_name, "-v") || !strcmp(option_name, "--version")) {
+    printf("swappy version %s\n", SWAPPY_VERSION);
+    exit(0);
+  }
+  return TRUE;
+}
+
 bool application_init(struct swappy_state *state) {
+  // Callback function for flags
+  gboolean (*GOptionArgFunc)(const gchar *option_name, const gchar *value,
+                             gpointer data, GError **error);
+  GOptionArgFunc = &callback_on_flag;
+
   const GOptionEntry cli_options[] = {
       {
           .long_name = "file",
@@ -745,6 +761,14 @@ bool application_init(struct swappy_state *state) {
           .description = "Print the final surface to the given file when "
                          "exiting, use - to print to stdout",
       },
+      {
+          .long_name = "version",
+          .short_name = 'v',
+          .flags = G_OPTION_FLAG_NO_ARG,
+          .arg = G_OPTION_ARG_CALLBACK,
+          .arg_data = GOptionArgFunc,
+          .description = "Print version and quit",
+      },
       {NULL}};
 
   state->app = gtk_application_new("me.jtheoof.swappy",

swappy.1.scd

@@ -23,10 +23,13 @@ to: *$HOME/Desktop*.
 
 # OPTIONS
 
-*-h*
+*-h, --help*
 	Show help message and quit.
 
-*-f* <file>
+*-v, --version*
+	Show version and quit.
+
+*-f, --file* <file>
 	A PNG file to load for editing.
 
 	If set to *-*, read the file from standard input instead. This is grim