[glib] glib-genmarshal: add --output option to write output to a file

[Matthias Clasen <matthiasc src gnome org>]

commit 0fbc98097fac4d3e647684f344e508abae109fdf
Author: Tim-Philipp Müller <tim centricular com>
Date:   Mon Aug 22 16:32:25 2016 +0100

    glib-genmarshal: add --output option to write output to a file
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770175

 gobject/glib-genmarshal.c |   48 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 47 insertions(+), 1 deletions(-)
---
diff --git a/gobject/glib-genmarshal.c b/gobject/glib-genmarshal.c
index ba13e44..2941954 100644
--- a/gobject/glib-genmarshal.c
+++ b/gobject/glib-genmarshal.c
@@ -122,6 +122,9 @@ static const GScannerConfig scanner_config_template =
 };
 static gchar           * const std_marshaller_prefix = "g_cclosure_marshal";
 static gchar           *marshaller_prefix = "g_cclosure_user_marshal";
+static gchar           *output_fn = NULL;
+static gint             output_fd = -1;
+static gchar           *output_tmpfn = NULL;
 static GHashTable      *marshallers = NULL;
 static FILE             *fout = NULL;
 static gboolean                 gen_cheader = FALSE;
@@ -807,9 +810,23 @@ main (int   argc,
 
   /* setup auxiliary structs */
   scanner = g_scanner_new (&scanner_config_template);
-  fout = stdout;
   marshallers = g_hash_table_new (g_str_hash, g_str_equal);
 
+  if (output_fn)
+    {
+      output_tmpfn = g_strconcat (output_fn, ".XXXXXX", NULL);
+      if ((output_fd = g_mkstemp (output_tmpfn)) == -1)
+        {
+          g_printerr ("Failed to create temp file \"%s\": %s\n", output_tmpfn, g_strerror (errno));
+          return EXIT_FAILURE;
+        }
+
+      fout = fdopen (output_fd, "wb");
+      g_assert (fout != NULL);
+    }
+  else
+    fout = stdout;
+
   /* add standard marshallers of the GObject library */
   if (std_includes)
     for (i = 0; i < G_N_ELEMENTS (gobject_marshallers); i++)
@@ -939,6 +956,19 @@ main (int   argc,
   g_hash_table_foreach_remove (marshallers, string_key_destroy, NULL);
   g_hash_table_destroy (marshallers);
 
+  if (output_fn)
+    {
+      fclose (fout);
+      if (g_rename (output_tmpfn, output_fn) != 0)
+        {
+         g_printerr ("Failed to rename \"%s\" to \"%s\": %s\n", output_tmpfn, output_fn, g_strerror (errno));
+          g_unlink (output_tmpfn);
+          exit_status = EXIT_FAILURE;
+        }
+
+      g_free (output_tmpfn);
+    }
+
   return exit_status;
 }
 
@@ -1002,6 +1032,21 @@ parse_args (gint    *argc_p,
            }
          argv[i] = NULL;
        }
+      else if ((strcmp ("--output", argv[i]) == 0) ||
+              (strncmp ("--output=", argv[i], 9) == 0))
+       {
+          gchar *equal = argv[i] + 8;
+
+         if (*equal == '=')
+           output_fn = equal + 1;
+         else if (i + 1 < argc)
+           {
+             output_fn = argv[i + 1];
+             argv[i] = NULL;
+             i += 1;
+           }
+         argv[i] = NULL;
+       }
       else if (strcmp ("-h", argv[i]) == 0 ||
           strcmp ("-?", argv[i]) == 0 ||
          strcmp ("--help", argv[i]) == 0)
@@ -1072,6 +1117,7 @@ print_blurb (FILE    *bout,
       g_fprintf (bout, "  --header                   Generate C headers\n");
       g_fprintf (bout, "  --body                     Generate C code\n");
       g_fprintf (bout, "  --prefix=string            Specify marshaller prefix\n");
+      g_fprintf (bout, "  --output=file              Write output into the specified file\n");
       g_fprintf (bout, "  --skip-source              Skip source location comments\n");
       g_fprintf (bout, "  --stdinc, --nostdinc       Include/use standard marshallers\n");
       g_fprintf (bout, "  --internal                 Mark generated functions as internal\n");