To avoid taking up so much space on normal output printing duplicate
information on consecutive lines that "belong" to the same revision,
this option allows to print a single line with the information about
the revision before the lines of content themselves.

Signed-off-by: Edmundo Carmona Antoranz <eantor...@gmail.com>
---
 Documentation/blame-options.txt |  4 ++
 Documentation/git-blame.txt     |  4 +-
 builtin/blame.c                 | 85 +++++++++++++++++++++++++++--------------
 3 files changed, 63 insertions(+), 30 deletions(-)

diff --git a/Documentation/blame-options.txt b/Documentation/blame-options.txt
index 2669b87c9..be2a327ff 100644
--- a/Documentation/blame-options.txt
+++ b/Documentation/blame-options.txt
@@ -49,6 +49,10 @@ include::line-range-format.txt[]
        Show the result incrementally in a format designed for
        machine consumption.
 
+--aggregate::
+       Aggregate information about revisions. This option makes no
+       difference on incremental or porcelain format.
+
 --encoding=<encoding>::
        Specifies the encoding used to output author names
        and commit summaries. Setting it to `none` makes blame
diff --git a/Documentation/git-blame.txt b/Documentation/git-blame.txt
index fdc3aea30..385eaf7be 100644
--- a/Documentation/git-blame.txt
+++ b/Documentation/git-blame.txt
@@ -10,8 +10,8 @@ SYNOPSIS
 [verse]
 'git blame' [-c] [-b] [-l] [--root] [-t] [-f] [-n] [-s] [-e] [-p] [-w] 
[--incremental]
            [-L <range>] [-S <revs-file>] [-M] [-C] [-C] [-C] [--since=<date>]
-           [--progress] [--abbrev=<n>] [<rev> | --contents <file> | --reverse 
<rev>..<rev>]
-           [--] <file>
+           [--progress] [--abbrev=<n>] [--aggregate] 
+           [<rev> | --contents <file> | --reverse <rev>..<rev>] [--] <file>
 
 DESCRIPTION
 -----------
diff --git a/builtin/blame.c b/builtin/blame.c
index 126b8c9e5..09b3b0c8a 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1884,6 +1884,7 @@ static const char *format_time(unsigned long time, const 
char *tz_str,
 #define OUTPUT_NO_AUTHOR       0200
 #define OUTPUT_SHOW_EMAIL      0400
 #define OUTPUT_LINE_PORCELAIN 01000
+#define OUTPUT_AGGREGATE      02000
 
 static void emit_porcelain_details(struct origin *suspect, int repeat)
 {
@@ -1931,43 +1932,41 @@ static void emit_porcelain(struct scoreboard *sb, 
struct blame_entry *ent,
                putchar('\n');
 }
 
-static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
-{
-       int cnt;
-       const char *cp;
-       struct origin *suspect = ent->suspect;
-       struct commit_info ci;
-       char hex[GIT_SHA1_HEXSZ + 1];
-       int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
-
-       get_commit_info(suspect->commit, &ci, 1);
-       sha1_to_hex_r(hex, suspect->commit->object.oid.hash);
-
-       cp = nth_line(sb, ent->lno);
-       for (cnt = 0; cnt < ent->num_lines; cnt++) {
-               char ch;
-               int length = (opt & OUTPUT_LONG_OBJECT_NAME) ? GIT_SHA1_HEXSZ : 
abbrev;
-
-               if (suspect->commit->object.flags & UNINTERESTING) {
+/**
+ * Print information about the revision.
+ * This information can be used in either aggregated output
+ * or prepending each line of the content of the file being blamed
+ * 
+ * if line_number == 0, it's an aggregate line
+ */
+static void print_revision_info(char* revision_hex, int revision_length, 
struct blame_entry* ent,
+               struct commit_info ci, int opt, int show_raw_time, int 
line_number)
+{
+       if (!line_number)
+               printf("\t");
+       int length = revision_length;
+       if (!line_number || !(opt & OUTPUT_AGGREGATE)) {
+               if (ent->suspect->commit->object.flags & UNINTERESTING) {
                        if (blank_boundary)
-                               memset(hex, ' ', length);
+                               memset(revision_hex, ' ', length);
                        else if (!(opt & OUTPUT_ANNOTATE_COMPAT)) {
                                length--;
                                putchar('^');
                        }
                }
 
-               printf("%.*s", length, hex);
+               printf("%.*s", length, revision_hex);
                if (opt & OUTPUT_ANNOTATE_COMPAT) {
                        const char *name;
                        if (opt & OUTPUT_SHOW_EMAIL)
                                name = ci.author_mail.buf;
                        else
                                name = ci.author.buf;
-                       printf("\t(%10s\t%10s\t%d)", name,
+                       printf("\t(%10s\t%10s", name,
                               format_time(ci.author_time, ci.author_tz.buf,
-                                          show_raw_time),
-                              ent->lno + 1 + cnt);
+                                          show_raw_time));
+                       if (line_number)
+                               printf("\t%d)", line_number);
                } else {
                        if (opt & OUTPUT_SHOW_SCORE)
                                printf(" %*d %02d",
@@ -1975,10 +1974,10 @@ static void emit_other(struct scoreboard *sb, struct 
blame_entry *ent, int opt)
                                       ent->suspect->refcnt);
                        if (opt & OUTPUT_SHOW_NAME)
                                printf(" %-*.*s", longest_file, longest_file,
-                                      suspect->path);
-                       if (opt & OUTPUT_SHOW_NUMBER)
+                                      ent->suspect->path);
+                       if ((opt & OUTPUT_SHOW_NUMBER) && line_number)
                                printf(" %*d", max_orig_digits,
-                                      ent->s_lno + 1 + cnt);
+                                      line_number);
 
                        if (!(opt & OUTPUT_NO_AUTHOR)) {
                                const char *name;
@@ -1994,9 +1993,38 @@ static void emit_other(struct scoreboard *sb, struct 
blame_entry *ent, int opt)
                                                   ci.author_tz.buf,
                                                   show_raw_time));
                        }
-                       printf(" %*d) ",
-                              max_digits, ent->lno + 1 + cnt);
+                       if (line_number)
+                               printf(" %*d) ",
+                                          max_digits, line_number);
                }
+       }
+       if (line_number && (opt & OUTPUT_AGGREGATE))
+               printf(opt & OUTPUT_ANNOTATE_COMPAT ? "%*d)" : " %*d) ",
+                          max_digits, line_number);
+       if (!line_number)
+               printf(")\n");
+}
+
+static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
+{
+       int cnt;
+       const char *cp;
+       struct origin *suspect = ent->suspect;
+       struct commit_info ci;
+       char hex[GIT_SHA1_HEXSZ + 1];
+       int show_raw_time = !!(opt & OUTPUT_RAW_TIMESTAMP);
+       int revision_length = (opt & OUTPUT_LONG_OBJECT_NAME) ? GIT_SHA1_HEXSZ 
: abbrev;
+
+       get_commit_info(suspect->commit, &ci, 1);
+       sha1_to_hex_r(hex, suspect->commit->object.oid.hash);
+
+       if (opt & OUTPUT_AGGREGATE)
+               print_revision_info(hex, revision_length, ent, ci, opt, 
show_raw_time, 0);
+
+       cp = nth_line(sb, ent->lno);
+       char ch;
+       for (cnt = 0; cnt < ent->num_lines; cnt++) {
+               print_revision_info(hex, revision_length, ent, ci, opt, 
show_raw_time, ent->lno + 1 + cnt);
                do {
                        ch = *cp++;
                        putchar(ch);
@@ -2609,6 +2637,7 @@ int cmd_blame(int argc, const char **argv, const char 
*prefix)
                { OPTION_CALLBACK, 'C', NULL, &opt, N_("score"), N_("Find line 
copies within and across files"), PARSE_OPT_OPTARG, blame_copy_callback },
                { OPTION_CALLBACK, 'M', NULL, &opt, N_("score"), N_("Find line 
movements within and across files"), PARSE_OPT_OPTARG, blame_move_callback },
                OPT_STRING_LIST('L', NULL, &range_list, N_("n,m"), N_("Process 
only line range n,m, counting from 1")),
+               OPT_BIT(0, "aggregate", &output_option, N_("Aggregate output"), 
OUTPUT_AGGREGATE),
                OPT__ABBREV(&abbrev),
                OPT_END()
        };
-- 
2.11.0.rc1

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