From: Johannes Schindelin <johannes.schinde...@gmx.de>

As pointed out by Elijah Newren, tbdiff has this neat little alignment
trick where it outputs the commit pairs with patch numbers that are
padded to the maximal patch number's width:

          1: cafedead =   1: acefade first patch
        [...]
        314: beefeada < 314: facecab up to PI!

Let's do the same in range-diff, too.

Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 range-diff.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/range-diff.c b/range-diff.c
index 870c3680c..d3e51bf36 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -254,7 +254,8 @@ static void get_correspondences(struct string_list *a, 
struct string_list *b,
        free(b2a);
 }
 
-static void output_pair_header(struct diff_options *diffopt, struct strbuf 
*buf,
+static void output_pair_header(struct diff_options *diffopt, int 
patch_no_width,
+                              struct strbuf *buf,
                               struct patch_util *a_util,
                               struct patch_util *b_util)
 {
@@ -293,9 +294,9 @@ static void output_pair_header(struct diff_options 
*diffopt, struct strbuf *buf,
        strbuf_reset(buf);
        strbuf_addstr(buf, status == '!' ? color_old : color);
        if (!a_util)
-               strbuf_addf(buf, "-:  %s ", dashes);
+               strbuf_addf(buf, "%*s:  %s ", patch_no_width, "-", dashes);
        else
-               strbuf_addf(buf, "%d:  %s ", a_util->i + 1,
+               strbuf_addf(buf, "%*d:  %s ", patch_no_width, a_util->i + 1,
                            find_unique_abbrev(&a_util->oid, DEFAULT_ABBREV));
 
        if (status == '!')
@@ -305,9 +306,9 @@ static void output_pair_header(struct diff_options 
*diffopt, struct strbuf *buf,
                strbuf_addf(buf, "%s%s", color_reset, color_new);
 
        if (!b_util)
-               strbuf_addf(buf, " -:  %s", dashes);
+               strbuf_addf(buf, " %*s:  %s", patch_no_width, "-", dashes);
        else
-               strbuf_addf(buf, " %d:  %s", b_util->i + 1,
+               strbuf_addf(buf, " %*d:  %s", patch_no_width, b_util->i + 1,
                            find_unique_abbrev(&b_util->oid, DEFAULT_ABBREV));
 
        commit = lookup_commit_reference(oid);
@@ -360,6 +361,7 @@ static void output(struct string_list *a, struct 
string_list *b,
                   struct diff_options *diffopt)
 {
        struct strbuf buf = STRBUF_INIT;
+       int patch_no_width = decimal_width(1 + (a->nr > b->nr ? a->nr : b->nr));
        int i = 0, j = 0;
 
        /*
@@ -381,21 +383,24 @@ static void output(struct string_list *a, struct 
string_list *b,
 
                /* Show unmatched LHS commit whose predecessors were shown. */
                if (i < a->nr && a_util->matching < 0) {
-                       output_pair_header(diffopt, &buf, a_util, NULL);
+                       output_pair_header(diffopt, patch_no_width, &buf,
+                                          a_util, NULL);
                        i++;
                        continue;
                }
 
                /* Show unmatched RHS commits. */
                while (j < b->nr && b_util->matching < 0) {
-                       output_pair_header(diffopt, &buf, NULL, b_util);
+                       output_pair_header(diffopt, patch_no_width, &buf,
+                                          NULL, b_util);
                        b_util = ++j < b->nr ? b->items[j].util : NULL;
                }
 
                /* Show matching LHS/RHS pair. */
                if (j < b->nr) {
                        a_util = a->items[b_util->matching].util;
-                       output_pair_header(diffopt, &buf, a_util, b_util);
+                       output_pair_header(diffopt, patch_no_width, &buf,
+                                          a_util, b_util);
                        if (!(diffopt->output_format & DIFF_FORMAT_NO_OUTPUT))
                                patch_diff(a->items[b_util->matching].string,
                                           b->items[j].string, diffopt);
-- 
gitgitgadget

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