In the "remote -> local" line, if either ref is a substring of the
other, the common part in the other string is replaced with "$". For
example

    abc                -> origin/abc
    refs/pull/123/head -> pull/123

become

    abc         -> origin/$
    refs/$/head -> pull/123

Activated with fetch.output=compact.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/config.txt    |  5 +++
 Documentation/git-fetch.txt |  5 +++
 builtin/fetch.c             | 75 ++++++++++++++++++++++++++++++++++++++++++++-
 t/t5510-fetch.sh            | 17 +++++++++-
 4 files changed, 100 insertions(+), 2 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 2e1b2e4..7f6e58d 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1220,6 +1220,11 @@ fetch.prune::
        If true, fetch will automatically behave as if the `--prune`
        option was given on the command line.  See also `remote.<name>.prune`.
 
+fetch.output::
+       Control how ref update status is printed. Valid values are
+       `full` and `compact`. Default value is `full`. See section
+       OUTPUT in linkgit:git-fetch[1] for detail.
+
 format.attach::
        Enable multipart/mixed attachments as the default for
        'format-patch'.  The value can also be a double quoted string
diff --git a/Documentation/git-fetch.txt b/Documentation/git-fetch.txt
index 771dde5..61e8885 100644
--- a/Documentation/git-fetch.txt
+++ b/Documentation/git-fetch.txt
@@ -116,6 +116,11 @@ representing the status of a single ref. Each line is of 
the form:
 The status of up-to-date refs is shown only if the --verbose option is
 used.
 
+In compact output mode, if either entire `<from>` or `<to>` is found
+in the other string, it will be substituted with `$` in the other
+string. or example, `master -> origin/master` becomes
+`master -> origin/$`.
+
 flag::
        A single character indicating the status of the ref:
 (space);; for a successfully fetched fast-forward;
diff --git a/builtin/fetch.c b/builtin/fetch.c
index c42795b..9d9f4e8 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -451,6 +451,7 @@ fail:
 }
 
 static int refcol_width = 10;
+static int compact_format;
 
 static void adjust_refcol_width(const struct ref *ref)
 {
@@ -462,6 +463,17 @@ static void adjust_refcol_width(const struct ref *ref)
 
        max    = term_columns();
        rlen   = utf8_strwidth(prettify_refname(ref->name));
+
+       if (compact_format) {
+               /*
+                * Not precise calculation because '$' can appear in
+                * ref->name and reduce actual length.
+                */
+               if (refcol_width < rlen)
+                       refcol_width = rlen;
+               return;
+       }
+
        llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
 
        /*
@@ -480,6 +492,16 @@ static void adjust_refcol_width(const struct ref *ref)
 static void prepare_format_display(struct ref *ref_map)
 {
        struct ref *rm;
+       const char *format = "full";
+
+       git_config_get_string_const("fetch.output", &format);
+       if (!strcasecmp(format, "full"))
+               compact_format = 0;
+       else if (!strcasecmp(format, "compact"))
+               compact_format = 1;
+       else
+               die(_("configuration fetch.output contains invalid value %s"),
+                   format);
 
        for (rm = ref_map; rm; rm = rm->next) {
                if (rm->status == REF_STATUS_REJECT_SHALLOW ||
@@ -491,12 +513,63 @@ static void prepare_format_display(struct ref *ref_map)
        }
 }
 
+static void print_remote_to_local(struct strbuf *display,
+                                 const char *remote, const char *local)
+{
+       strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
+}
+
+static int dollarize(struct strbuf *haystack, const char *needle)
+{
+       const char *p = strstr(haystack->buf, needle);
+       int plen, nlen;
+
+       if (!p)
+               return 0;
+
+       if (p > haystack->buf && p[-1] != '/')
+               return 0;
+
+       plen = strlen(p);
+       nlen = strlen(needle);
+       if (plen > nlen && p[nlen] != '/')
+               return 0;
+
+       strbuf_splice(haystack, p - haystack->buf, nlen, "$", 1);
+       return 1;
+}
+
+static void print_compact(struct strbuf *display,
+                         const char *remote, const char *local)
+{
+       struct strbuf r = STRBUF_INIT;
+       struct strbuf l = STRBUF_INIT;
+
+       if (!strcmp(remote, local)) {
+               strbuf_addf(display, "%-*s -> $", refcol_width, remote);
+               return;
+       }
+
+       strbuf_addstr(&r, remote);
+       strbuf_addstr(&l, local);
+
+       if (!dollarize(&r, local))
+               dollarize(&l, remote);
+       print_remote_to_local(display, r.buf, l.buf);
+
+       strbuf_release(&r);
+       strbuf_release(&l);
+}
+
 static void format_display(struct strbuf *display, char code,
                           const char *summary, const char *error,
                           const char *remote, const char *local)
 {
        strbuf_addf(display, "%c %-*s ", code, TRANSPORT_SUMMARY(summary));
-       strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
+       if (!compact_format)
+               print_remote_to_local(display, remote, local);
+       else
+               print_compact(display, remote, local);
        if (error)
                strbuf_addf(display, "  (%s)", error);
 }
diff --git a/t/t5510-fetch.sh b/t/t5510-fetch.sh
index f50497e..3a92718 100755
--- a/t/t5510-fetch.sh
+++ b/t/t5510-fetch.sh
@@ -693,7 +693,7 @@ test_expect_success 'fetch aligned output' '
        test_commit looooooooooooong-tag &&
        (
                cd full-output &&
-               git fetch origin 2>&1 | \
+               git -c fetch.output=full fetch origin 2>&1 | \
                        grep -e "->" | cut -c 22- >../actual
        ) &&
        cat >expect <<-\EOF &&
@@ -703,4 +703,19 @@ test_expect_success 'fetch aligned output' '
        test_cmp expect actual
 '
 
+test_expect_success 'fetch compact output' '
+       git clone . compact &&
+       test_commit extraaa &&
+       (
+               cd compact &&
+               git -c fetch.output=compact fetch origin 2>&1 | \
+                       grep -e "->" | cut -c 22- >../actual
+       ) &&
+       cat >expect <<-\EOF &&
+       master     -> origin/$
+       extraaa    -> $
+       EOF
+       test_cmp expect actual
+'
+
 test_done
-- 
2.8.2.526.g02eed6d

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