[libgit2-glib] Added ggit_diff_patch_to_stream

[Jesse van den Kieboom <jessevdk src gnome org>]

commit 9421d6116add67ab89c444e69519f2603700e595
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sat Jun 29 17:34:14 2013 +0200

    Added ggit_diff_patch_to_stream

 libgit2-glib/ggit-diff-patch.c |   80 ++++++++++++++++++++++++++++++++++++++++
 libgit2-glib/ggit-diff-patch.h |    5 ++
 2 files changed, 85 insertions(+), 0 deletions(-)
---
diff --git a/libgit2-glib/ggit-diff-patch.c b/libgit2-glib/ggit-diff-patch.c
index 52411f6..47c70b8 100644
--- a/libgit2-glib/ggit-diff-patch.c
+++ b/libgit2-glib/ggit-diff-patch.c
@@ -19,6 +19,7 @@
  */
 
 #include "ggit-diff-patch.h"
+#include "ggit-error.h"
 
 struct _GgitDiffPatch
 {
@@ -97,6 +98,7 @@ ggit_diff_patch_to_string (GgitDiffPatch  *diff_patch,
        gchar *gstr;
 
        g_return_val_if_fail (diff_patch != NULL, NULL);
+       g_return_val_if_fail (error == NULL || *error == NULL, NULL);
 
        ret = git_diff_patch_to_str (&str, diff_patch->diff_patch);
 
@@ -111,4 +113,82 @@ ggit_diff_patch_to_string (GgitDiffPatch  *diff_patch,
        return gstr;
 }
 
+typedef struct
+{
+       GOutputStream  *stream;
+       GError        **error;
+} PatchToStream;
+
+static int
+patch_to_stream (const git_diff_delta *delta,
+                 const git_diff_range *range,
+                 char                  line_origin,
+                 const char           *content,
+                 size_t                content_len,
+                 void                 *payload)
+{
+       PatchToStream *info = payload;
+       gboolean ret;
+       gsize written;
+
+       ret = g_output_stream_write_all (info->stream,
+                                        content,
+                                        content_len,
+                                        &written,
+                                        NULL,
+                                        info->error);
+
+       if (!ret)
+       {
+               return -1;
+       }
+       else
+       {
+               return written;
+       }
+}
+
+/**
+ * ggit_diff_patch_to_stream:
+ * @diff_patch: a #GgitDiffPatch.
+ * @stream: a #GOutputStream.
+ * @error: a #GError for error reporting, or %NULL.
+ *
+ * Write the contents of a patch to the provided stream.
+ *
+ * Returns: %TRUE if the patch was written successfully, %FALSE otherwise.
+ *
+ **/
+gboolean
+ggit_diff_patch_to_stream (GgitDiffPatch  *diff_patch,
+                           GOutputStream  *stream,
+                           GError        **error)
+{
+       PatchToStream info;
+       gint ret;
+
+       g_return_val_if_fail (diff_patch != NULL, FALSE);
+       g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
+       g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
+
+       info.stream = stream;
+       info.error = error;
+
+       ret = git_diff_patch_print (diff_patch->diff_patch,
+                                   patch_to_stream,
+                                   &info);
+
+       if (ret != GIT_OK)
+       {
+               if (error != NULL && *error == NULL)
+               {
+                       _ggit_error_set (error, ret);
+               }
+
+               return FALSE;
+       }
+
+       return TRUE;
+}
+
 /* ex:set ts=8 noet: */
diff --git a/libgit2-glib/ggit-diff-patch.h b/libgit2-glib/ggit-diff-patch.h
index 2a6dde7..b7eccb0 100644
--- a/libgit2-glib/ggit-diff-patch.h
+++ b/libgit2-glib/ggit-diff-patch.h
@@ -22,6 +22,7 @@
 #define __GGIT_DIFF_PATCH_H__
 
 #include <glib-object.h>
+#include <gio/gio.h>
 #include <git2.h>
 #include "ggit-types.h"
 
@@ -41,6 +42,10 @@ void             ggit_diff_patch_unref          (GgitDiffPatch    *diff_patch);
 gchar           *ggit_diff_patch_to_string      (GgitDiffPatch    *diff_patch,
                                                  GError          **error);
 
+gboolean         ggit_diff_patch_to_stream      (GgitDiffPatch    *diff_patch,
+                                                 GOutputStream    *stream,
+                                                 GError          **error);
+
 G_END_DECLS
 
 #endif /* __GGIT_DIFF_PATCH_H__ */