pretty: allow tweaking tabwidth in --expand-tabs

When the local convention of the project is to use tab width that is
not 8, it may make sense to allow "git log --expand-tabs=<n>" to
tweak the output to match it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/pretty-options.txt b/Documentation/pretty-options.txt
index edbb02f18c13c6fb93e594426f4c3173bdedf603..93ad1cdc404a812228e78b85c225e6354359ac7f 100644 (file)
--- a/Documentation/pretty-options.txt
+++ b/Documentation/pretty-options.txt
@@ -42,16 +42,19 @@ people using 80-column terminals.
        verbatim; this means that invalid sequences in the original
        commit may be copied to the output.
 
+--expand-tabs=<n>::
 --expand-tabs::
 --no-expand-tabs::
        Perform a tab expansion (replace each tab with enough spaces
-       to fill to the next display column that is multiple of 8)
+       to fill to the next display column that is multiple of '<n>')
        in the log message before showing it in the output.
+       `--expand-tabs` is a short-hand for `--expand-tabs=8`, and
+       `--no-expand-tabs` is a short-hand for `--expand-tabs=0`,
+       which disables tab expansion.
 +
 By default, tabs are expanded in pretty formats that indent the log
 message by 4 spaces (i.e.  'medium', which is the default, 'full',
-and 'fuller').  `--no-expand-tabs` option can be used to disable
-this.
+and 'fuller').
 
 ifndef::git-rev-list[]
 --notes[=<ref>]::

diff --git a/commit.h b/commit.h
index a7ef682b5a6424bf8575851a5ec52eaa84492a59..b06db4d5d9004e329a2a04de3d9af71a3578ef9d 100644 (file)
--- a/commit.h
+++ b/commit.h
@@ -147,7 +147,7 @@ struct pretty_print_context {
        int preserve_subject;
        struct date_mode date_mode;
        unsigned date_mode_explicit:1;
-       unsigned expand_tabs_in_log:1;
+       int expand_tabs_in_log;
        int need_8bit_cte;
        char *notes_message;
        struct reflog_walk_info *reflog_info;

diff --git a/pretty.c b/pretty.c
index b7938e0ef7e18e09b7fdb3bead2e19f6e24824a1..87c44971a1d2070e4d256818e96fccc29472ec4a 100644 (file)
--- a/pretty.c
+++ b/pretty.c
@@ -89,11 +89,11 @@ static void setup_commit_formats(void)
 {
        struct cmt_fmt_map builtin_formats[] = {
                { "raw",        CMIT_FMT_RAW,           0,      0 },
-               { "medium",     CMIT_FMT_MEDIUM,        0,      1 },
+               { "medium",     CMIT_FMT_MEDIUM,        0,      8 },
                { "short",      CMIT_FMT_SHORT,         0,      0 },
                { "email",      CMIT_FMT_EMAIL,         0,      0 },
-               { "fuller",     CMIT_FMT_FULLER,        0,      1 },
-               { "full",       CMIT_FMT_FULL,          0,      1 },
+               { "fuller",     CMIT_FMT_FULLER,        0,      8 },
+               { "full",       CMIT_FMT_FULL,          0,      8 },
                { "oneline",    CMIT_FMT_ONELINE,       1,      0 }
        };
        commit_formats_len = ARRAY_SIZE(builtin_formats);
@@ -1645,7 +1645,7 @@ static int pp_utf8_width(const char *start, const char *end)
        return width;
 }
 
-static void strbuf_add_tabexpand(struct strbuf *sb,
+static void strbuf_add_tabexpand(struct strbuf *sb, int tabwidth,
                                 const char *line, int linelen)
 {
        const char *tab;
@@ -1666,7 +1666,7 @@ static void strbuf_add_tabexpand(struct strbuf *sb,
                strbuf_add(sb, line, tab - line);
 
                /* .. and the de-tabified tab */
-               strbuf_addchars(sb, ' ', 8 - (width % 8));
+               strbuf_addchars(sb, ' ', tabwidth - (width % tabwidth));
 
                /* Skip over the printed part .. */
                linelen -= tab + 1 - line;
@@ -1692,7 +1692,7 @@ static void pp_handle_indent(struct pretty_print_context *pp,
 {
        strbuf_addchars(sb, ' ', indent);
        if (pp->expand_tabs_in_log)
-               strbuf_add_tabexpand(sb, line, linelen);
+               strbuf_add_tabexpand(sb, pp->expand_tabs_in_log, line, linelen);
        else
                strbuf_add(sb, line, linelen);
 }
@@ -1723,7 +1723,8 @@ void pp_remainder(struct pretty_print_context *pp,
                if (indent)
                        pp_handle_indent(pp, sb, indent, line, linelen);
                else if (pp->expand_tabs_in_log)
-                       strbuf_add_tabexpand(sb, line, linelen);
+                       strbuf_add_tabexpand(sb, pp->expand_tabs_in_log,
+                                            line, linelen);
                else
                        strbuf_add(sb, line, linelen);
                strbuf_addch(sb, '\n');

diff --git a/revision.c b/revision.c
index da53b6ce35841c03a541141165fb49297bf68c27..47e9ee7a14060b7848436ee0049b12ccf2378180 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -1415,7 +1415,7 @@ void init_revisions(struct rev_info *revs, const char *prefix)
        revs->expand_tabs_in_log = -1;
 
        revs->commit_format = CMIT_FMT_DEFAULT;
-       revs->expand_tabs_in_log_default = 1;
+       revs->expand_tabs_in_log_default = 8;
 
        init_grep_defaults();
        grep_init(&revs->grep_filter, prefix);
@@ -1918,9 +1918,14 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->pretty_given = 1;
                get_commit_format(arg+9, revs);
        } else if (!strcmp(arg, "--expand-tabs")) {
-               revs->expand_tabs_in_log = 1;
+               revs->expand_tabs_in_log = 8;
        } else if (!strcmp(arg, "--no-expand-tabs")) {
                revs->expand_tabs_in_log = 0;
+       } else if (skip_prefix(arg, "--expand-tabs=", &arg)) {
+               int val;
+               if (strtol_i(arg, 10, &val) < 0 || val < 0)
+                       die("'%s': not a non-negative integer", arg);
+               revs->expand_tabs_in_log = val;
        } else if (!strcmp(arg, "--show-notes") || !strcmp(arg, "--notes")) {
                revs->show_notes = 1;
                revs->show_notes_given = 1;