From: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
Pretty placeholders %>(N) and %<(N) require a user provided width N,
which makes sense because the commit chain could be really long and the
user only needs to look at a few at the top, going to the end just to
calculate the best width wastes CPU cycles.
for-each-ref is different; the display set is small, and we display them
all at once. We even support sorting, which goes through all display
items anyway. This patch introduces new %>(*) and %<(*), which are
supposed to be followed immediately by %(fieldname) (i.e. original
for-each-ref specifiers, not ones coming from pretty.c). They calculate
the best width for the %(fieldname), ignoring ansi escape sequences if
any.
[rr: documentation]
Signed-off-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
---
Documentation/git-for-each-ref.txt | 7 +++++++
builtin/for-each-ref.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index 6135812..7d6db7f 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -47,6 +47,10 @@ OPTIONS
are hex digits interpolates to character with hex code
`xx`; for example `%00` interpolates to `\0` (NUL),
`%09` to `\t` (TAB) and `%0a` to `\n` (LF).
++
+Placeholders `%<(*)` and `%>(*)` work like `%<(<N>)` and `%>(<N>)`
+respectively, except that the width of the next placeholder is
+calculated.
<pretty>::
A format string with supporting placeholders described in the
@@ -67,6 +71,9 @@ Caveats:
3. Only the placeholders inherited from `<format>` will respect
quoting settings.
+3. Only the placeholders inherited from `<format>` will work with the
+ alignment placeholders `%<(*)` and '%>(*)`.
+
<pattern>...::
If one or more patterns are given, only refs are shown that
match against at least one pattern, either using fnmatch(3) or
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index f8a3880..053a622 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -9,6 +9,7 @@
#include "quote.h"
#include "parse-options.h"
#include "remote.h"
+#include "utf8.h"
/* Quoting styles */
#define QUOTE_NONE 0
@@ -966,10 +967,30 @@ static void show_refs(struct refinfo **refs, int maxcount,
}
struct format_one_atom_context {
+ struct refinfo **refs;
+ int maxcount;
+
struct refinfo *info;
int quote_style;
};
+static unsigned int get_atom_width(struct format_one_atom_context *ctx,
+ const char *start, const char *end)
+{
+ struct strbuf sb = STRBUF_INIT;
+ int i, atom = parse_atom(start, end);
+ unsigned int len = 0, sb_len;
+ for (i = 0; i < ctx->maxcount; i++) {
+ print_value(&sb, ctx->refs[i], atom, ctx->quote_style);
+ sb_len = utf8_strnwidth(sb.buf, sb.len, 1);
+ if (sb_len > len)
+ len = sb_len;
+ strbuf_reset(&sb);
+ }
+ strbuf_release(&sb);
+ return len;
+}
+
static size_t format_one_atom(struct strbuf *sb, const char *placeholder,
void *format_context, void *user_data,
struct strbuf *subst)
@@ -982,6 +1003,21 @@ static size_t format_one_atom(struct strbuf *sb, const char *placeholder,
return 1;
}
+ /*
+ * Substitute %>(*)%(atom) and friends with real width.
+ */
+ if (*placeholder == '>' || *placeholder == '<') {
+ const char *star = placeholder + 1;
+ if (!prefixcmp(star, "(*)%(") &&
+ ((ep = strchr(star + strlen("(*)%("), ')')) != NULL)) {
+ star++;
+ strbuf_addf(subst, "%c(%u)",
+ *placeholder,
+ get_atom_width(ctx, star + strlen("*)%("), ep));
+ return 1 + strlen("(*)");
+ }
+ }
+
if (*placeholder != '(')
return 0;
@@ -1003,6 +1039,8 @@ static void show_pretty_refs(struct refinfo **refs, int maxcount,
ctx.format = format_one_atom;
ctx.user_data = &fctx;
+ fctx.refs = refs;
+ fctx.maxcount = maxcount;
fctx.quote_style = quote_style;
for (i = 0; i < maxcount; i++) {
struct commit *commit = NULL;
--
1.8.3.GIT
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