Format git diff headers correctly when adding or removing files.

Copying the output of cgit and using it in patches now works when adding
files to or removing files from the repository. This is helpful for people
who use cgit in their patch workflow.

2 files changed, 22 insertions, 14 deletions

diff --git a/ui-diff.c b/ui-diff.c
index c6bad63..3d46da2 100644
--- a/ui-diff.c
+++ b/ui-diff.c
@@ -229,11 +229,6 @@ static void header(unsigned char *sha1, char *path1, int mode1,
         html(" b/");
         html_txt(path2);
 
-        if (is_null_sha1(sha1))
-                path1 = "dev/null";
-        if (is_null_sha1(sha2))
-                path2 = "dev/null";
-
         if (mode1 == 0)
                 htmlf("<br/>new file mode %.6o", mode2);
 
@@ -251,13 +246,21 @@ static void header(unsigned char *sha1, char *path1, int mode1,
                         if (mode2 != mode1)
                                 htmlf("..%.6o", mode2);
                 }
-                html("<br/>--- a/");
+                if (is_null_sha1(sha1)) {
+                        path1 = "dev/null";
+                        html("<br/>--- /");
+                } else
+                        html("<br/>--- a/");
                 if (mode1 != 0)
                         cgit_tree_link(path1, NULL, NULL, ctx.qry.head,
                                        sha1_to_hex(old_rev_sha1), path1);
                 else
                         html_txt(path1);
-                html("<br/>+++ b/");
+                if (is_null_sha1(sha2)) {
+                        path2 = "dev/null";
+                        html("<br/>+++ /");
+                } else
+                        html("<br/>+++ b/");
                 if (mode2 != 0)
                         cgit_tree_link(path2, NULL, NULL, ctx.qry.head,
                                        sha1_to_hex(new_rev_sha1), path2);
diff --git a/ui-patch.c b/ui-patch.c
index ca008f3..79bc509 100644
--- a/ui-patch.c
+++ b/ui-patch.c
@@ -28,11 +28,6 @@ static void header(unsigned char *sha1, char *path1, int mode1,
         subproject = (S_ISGITLINK(mode1) || S_ISGITLINK(mode2));
         htmlf("diff --git a/%s b/%s\n", path1, path2);
 
-        if (is_null_sha1(sha1))
-                path1 = "dev/null";
-        if (is_null_sha1(sha2))
-                path2 = "dev/null";
-
         if (mode1 == 0)
                 htmlf("new file mode %.6o\n", mode2);
 
@@ -50,8 +45,18 @@ static void header(unsigned char *sha1, char *path1, int mode1,
                         if (mode2 != mode1)
                                 htmlf("..%.6o", mode2);
                 }
-                htmlf("\n--- a/%s\n", path1);
-                htmlf("+++ b/%s\n", path2);
+
+                if (is_null_sha1(sha1)) {
+                        path1 = "dev/null";
+                        htmlf("\n--- /%s\n", path1);
+                } else
+                        htmlf("\n--- a/%s\n", path1);
+
+                if (is_null_sha1(sha2)) {
+                        path2 = "dev/null";
+                        htmlf("+++ /%s\n", path2);
+                } else
+                        htmlf("+++ b/%s\n", path2);
         }
 }