combine-diff.c: teach combined diffs about line prefix

When running "git log --graph --cc -p" the diff output for merges is not
indented by the graph structure, unlike the diffs of non-merge commits
(added in commit 7be5761 - diff.c: Output the text graph padding before
each diff line).

Fix this by teaching the combined diff code to output diff_line_prefix()
before each line.

Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/combine-diff.c b/combine-diff.c
index bb1cc96c4e73c90ee327858aa3b36cf2bfe043a4..35c817bb2c52399c6eaaebb23dc6c3ba05c0ea2b 100644 (file)
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -526,7 +526,8 @@ static void show_line_to_eol(const char *line, int len, const char *reset)
               saw_cr_at_eol ? "\r" : "");
 }
 
-static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
+static void dump_sline(struct sline *sline, const char *line_prefix,
+                      unsigned long cnt, int num_parent,
                       int use_color, int result_deleted)
 {
        unsigned long mark = (1UL<<num_parent);
@@ -582,7 +583,7 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
                        rlines -= null_context;
                }
 
-               fputs(c_frag, stdout);
+               printf("%s%s", line_prefix, c_frag);
                for (i = 0; i <= num_parent; i++) putchar(combine_marker);
                for (i = 0; i < num_parent; i++)
                        show_parent_lno(sline, lno, hunk_end, i, null_context);
@@ -614,7 +615,7 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
                        struct sline *sl = &sline[lno++];
                        ll = (sl->flag & no_pre_delete) ? NULL : sl->lost_head;
                        while (ll) {
-                               fputs(c_old, stdout);
+                               printf("%s%s", line_prefix, c_old);
                                for (j = 0; j < num_parent; j++) {
                                        if (ll->parent_map & (1UL<<j))
                                                putchar('-');
@@ -627,6 +628,7 @@ static void dump_sline(struct sline *sline, unsigned long cnt, int num_parent,
                        if (cnt < lno)
                                break;
                        p_mask = 1;
+                       fputs(line_prefix, stdout);
                        if (!(sl->flag & (mark-1))) {
                                /*
                                 * This sline was here to hang the
@@ -680,11 +682,13 @@ static void reuse_combine_diff(struct sline *sline, unsigned long cnt,
 static void dump_quoted_path(const char *head,
                             const char *prefix,
                             const char *path,
+                            const char *line_prefix,
                             const char *c_meta, const char *c_reset)
 {
        static struct strbuf buf = STRBUF_INIT;
 
        strbuf_reset(&buf);
+       strbuf_addstr(&buf, line_prefix);
        strbuf_addstr(&buf, c_meta);
        strbuf_addstr(&buf, head);
        quote_two_c_style(&buf, prefix, path, 0);
@@ -696,6 +700,7 @@ static void show_combined_header(struct combine_diff_path *elem,
                                 int num_parent,
                                 int dense,
                                 struct rev_info *rev,
+                                const char *line_prefix,
                                 int mode_differs,
                                 int show_file_header)
 {
@@ -714,8 +719,8 @@ static void show_combined_header(struct combine_diff_path *elem,
                show_log(rev);
 
        dump_quoted_path(dense ? "diff --cc " : "diff --combined ",
-                        "", elem->path, c_meta, c_reset);
-       printf("%sindex ", c_meta);
+                        "", elem->path, line_prefix, c_meta, c_reset);
+       printf("%s%sindex ", line_prefix, c_meta);
        for (i = 0; i < num_parent; i++) {
                abb = find_unique_abbrev(elem->parent[i].sha1,
                                         abbrev);
@@ -734,11 +739,12 @@ static void show_combined_header(struct combine_diff_path *elem,
                            DIFF_STATUS_ADDED)
                                added = 0;
                if (added)
-                       printf("%snew file mode %06o",
-                              c_meta, elem->mode);
+                       printf("%s%snew file mode %06o",
+                              line_prefix, c_meta, elem->mode);
                else {
                        if (deleted)
-                               printf("%sdeleted file ", c_meta);
+                               printf("%s%sdeleted file ",
+                                      line_prefix, c_meta);
                        printf("mode ");
                        for (i = 0; i < num_parent; i++) {
                                printf("%s%06o", i ? "," : "",
@@ -755,16 +761,16 @@ static void show_combined_header(struct combine_diff_path *elem,
 
        if (added)
                dump_quoted_path("--- ", "", "/dev/null",
-                                c_meta, c_reset);
+                                line_prefix, c_meta, c_reset);
        else
                dump_quoted_path("--- ", a_prefix, elem->path,
-                                c_meta, c_reset);
+                                line_prefix, c_meta, c_reset);
        if (deleted)
                dump_quoted_path("+++ ", "", "/dev/null",
-                                c_meta, c_reset);
+                                line_prefix, c_meta, c_reset);
        else
                dump_quoted_path("+++ ", b_prefix, elem->path,
-                                c_meta, c_reset);
+                                line_prefix, c_meta, c_reset);
 }
 
 static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
@@ -782,6 +788,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
        struct userdiff_driver *userdiff;
        struct userdiff_driver *textconv = NULL;
        int is_binary;
+       const char *line_prefix = diff_line_prefix(opt);
 
        context = opt->context;
        userdiff = userdiff_find_by_path(elem->path);
@@ -901,7 +908,7 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
        }
        if (is_binary) {
                show_combined_header(elem, num_parent, dense, rev,
-                                    mode_differs, 0);
+                                    line_prefix, mode_differs, 0);
                printf("Binary files differ\n");
                free(result);
                return;
@@ -962,8 +969,8 @@ static void show_patch_diff(struct combine_diff_path *elem, int num_parent,
 
        if (show_hunks || mode_differs || working_tree_file) {
                show_combined_header(elem, num_parent, dense, rev,
-                                    mode_differs, 1);
-               dump_sline(sline, cnt, num_parent,
+                                    line_prefix, mode_differs, 1);
+               dump_sline(sline, line_prefix, cnt, num_parent,
                           opt->use_color, result_deleted);
        }
        free(result);
@@ -990,6 +997,7 @@ static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct re
        int i, offset;
        const char *prefix;
        int line_termination, inter_name_termination;
+       const char *line_prefix = diff_line_prefix(opt);
 
        line_termination = opt->line_termination;
        inter_name_termination = '\t';
@@ -1000,6 +1008,7 @@ static void show_raw_diff(struct combine_diff_path *p, int num_parent, struct re
                show_log(rev);
 
        if (opt->output_format & DIFF_FORMAT_RAW) {
+               printf("%s", line_prefix);
                offset = strlen(COLONS) - num_parent;
                if (offset < 0)
                        offset = 0;
@@ -1040,6 +1049,7 @@ void show_combined_diff(struct combine_diff_path *p,
                       struct rev_info *rev)
 {
        struct diff_options *opt = &rev->diffopt;
+
        if (!p->len)
                return;
        if (opt->output_format & (DIFF_FORMAT_RAW |
@@ -1150,8 +1160,10 @@ void diff_tree_combined(const unsigned char *sha1,
 
                if (show_log_first && i == 0) {
                        show_log(rev);
+
                        if (rev->verbose_header && opt->output_format)
-                               putchar(opt->line_termination);
+                               printf("%s%c", diff_line_prefix(opt),
+                                      opt->line_termination);
                }
                diff_flush(&diffopts);
        }
@@ -1179,7 +1191,8 @@ void diff_tree_combined(const unsigned char *sha1,
 
                if (opt->output_format & DIFF_FORMAT_PATCH) {
                        if (needsep)
-                               putchar(opt->line_termination);
+                               printf("%s%c", diff_line_prefix(opt),
+                                      opt->line_termination);
                        for (p = paths; p; p = p->next) {
                                if (p->len)
                                        show_patch_diff(p, num_parent, dense,