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Pretty-format: %[+-]x to tweak inter-item newlines

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This teaches the "pretty" machinery to expand '%+x' to a LF followed by
the expansion of '%x' if and only if '%x' expands to a non-empty string,
and to remove LFs before '%-x' if '%x' expands to an empty string.  This
works for any supported expansion placeholder 'x'.

This is expected to be immediately useful to reproduce the commit log
message with "%s%+b%n"; "%s%n%b%n" adds one extra LF if the log message is
a one-liner.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2009-10-04 23:43:32 -07:00
parent a7aebb9d00
commit 9fa708dab1
3 changed files with 70 additions and 2 deletions
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42
pretty.c
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@ -595,8 +595,8 @@ static void format_decoration(struct strbuf *sb, const struct commit *commit)
strbuf_addch(sb, ')');
}
static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
void *context)
static size_t format_commit_one(struct strbuf *sb, const char *placeholder,
void *context)
{
struct format_commit_context *c = context;
const struct commit *commit = c->commit;
@ -739,6 +739,44 @@ static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
return 0; /* unknown placeholder */
}
static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
void *context)
{
int consumed;
size_t orig_len;
enum {
NO_MAGIC,
ADD_LF_BEFORE_NON_EMPTY,
DEL_LF_BEFORE_EMPTY,
} magic = NO_MAGIC;
switch (placeholder[0]) {
case '-':
magic = DEL_LF_BEFORE_EMPTY;
break;
case '+':
magic = ADD_LF_BEFORE_NON_EMPTY;
break;
default:
break;
}
if (magic != NO_MAGIC)
placeholder++;
orig_len = sb->len;
consumed = format_commit_one(sb, placeholder, context);
if (magic == NO_MAGIC)
return consumed;
if ((orig_len == sb->len) && magic == DEL_LF_BEFORE_EMPTY) {
while (sb->len && sb->buf[sb->len - 1] == '\n')
strbuf_setlen(sb, sb->len - 1);
} else if ((orig_len != sb->len) && magic == ADD_LF_BEFORE_NON_EMPTY) {
strbuf_insert(sb, orig_len, "\n", 1);
}
return consumed + 1;
}
void format_commit_message(const struct commit *commit,
const void *format, struct strbuf *sb,
enum date_mode dmode)