mirror of
https://github.com/git/git
synced 2024-10-03 23:29:36 +00:00
844c3f0b0b
When we use `git for-each-ref`, every ref will allocate
its own output strbuf and error strbuf. But we can reuse
the final strbuf for each step ref's output. The error
buffer will also be reused, despite the fact that the git
will exit when `format_ref_array_item()` return a non-zero
value and output the contents of the error buffer.
The performance for `git for-each-ref` on the Git repository
itself with performance testing tool `hyperfine` changes from
23.7 ms ± 0.9 ms to 22.2 ms ± 1.0 ms. Optimization is relatively
minor.
At the same time, we apply this optimization to `git tag -l`
and `git branch -l`.
This approach is similar to the one used by 79ed0a5
(cat-file: use a single strbuf for all output, 2018-08-14)
to speed up the cat-file builtin.
Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Jeff King <peff@peff.net>
Helped-by: René Scharfe <l.s.r@web.de>
Signed-off-by: ZheNing Hu <adlternative@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "config.h"
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#include "refs.h"
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#include "object.h"
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#include "parse-options.h"
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#include "ref-filter.h"
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static char const * const for_each_ref_usage[] = {
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N_("git for-each-ref [<options>] [<pattern>]"),
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N_("git for-each-ref [--points-at <object>]"),
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N_("git for-each-ref [--merged [<commit>]] [--no-merged [<commit>]]"),
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N_("git for-each-ref [--contains [<commit>]] [--no-contains [<commit>]]"),
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NULL
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};
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int cmd_for_each_ref(int argc, const char **argv, const char *prefix)
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{
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int i;
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struct ref_sorting *sorting = NULL, **sorting_tail = &sorting;
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int maxcount = 0, icase = 0;
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struct ref_array array;
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struct ref_filter filter;
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struct ref_format format = REF_FORMAT_INIT;
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struct strbuf output = STRBUF_INIT;
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struct strbuf err = STRBUF_INIT;
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struct option opts[] = {
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OPT_BIT('s', "shell", &format.quote_style,
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N_("quote placeholders suitably for shells"), QUOTE_SHELL),
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OPT_BIT('p', "perl", &format.quote_style,
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N_("quote placeholders suitably for perl"), QUOTE_PERL),
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OPT_BIT(0 , "python", &format.quote_style,
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N_("quote placeholders suitably for python"), QUOTE_PYTHON),
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OPT_BIT(0 , "tcl", &format.quote_style,
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N_("quote placeholders suitably for Tcl"), QUOTE_TCL),
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OPT_GROUP(""),
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OPT_INTEGER( 0 , "count", &maxcount, N_("show only <n> matched refs")),
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OPT_STRING( 0 , "format", &format.format, N_("format"), N_("format to use for the output")),
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OPT__COLOR(&format.use_color, N_("respect format colors")),
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OPT_REF_SORT(sorting_tail),
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OPT_CALLBACK(0, "points-at", &filter.points_at,
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N_("object"), N_("print only refs which points at the given object"),
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parse_opt_object_name),
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OPT_MERGED(&filter, N_("print only refs that are merged")),
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OPT_NO_MERGED(&filter, N_("print only refs that are not merged")),
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OPT_CONTAINS(&filter.with_commit, N_("print only refs which contain the commit")),
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OPT_NO_CONTAINS(&filter.no_commit, N_("print only refs which don't contain the commit")),
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OPT_BOOL(0, "ignore-case", &icase, N_("sorting and filtering are case insensitive")),
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OPT_END(),
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};
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memset(&array, 0, sizeof(array));
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memset(&filter, 0, sizeof(filter));
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format.format = "%(objectname) %(objecttype)\t%(refname)";
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git_config(git_default_config, NULL);
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parse_options(argc, argv, prefix, opts, for_each_ref_usage, 0);
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if (maxcount < 0) {
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error("invalid --count argument: `%d'", maxcount);
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usage_with_options(for_each_ref_usage, opts);
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}
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if (HAS_MULTI_BITS(format.quote_style)) {
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error("more than one quoting style?");
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usage_with_options(for_each_ref_usage, opts);
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}
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if (verify_ref_format(&format))
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usage_with_options(for_each_ref_usage, opts);
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if (!sorting)
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sorting = ref_default_sorting();
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ref_sorting_set_sort_flags_all(sorting, REF_SORTING_ICASE, icase);
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filter.ignore_case = icase;
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filter.name_patterns = argv;
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filter.match_as_path = 1;
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filter_refs(&array, &filter, FILTER_REFS_ALL | FILTER_REFS_INCLUDE_BROKEN);
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ref_array_sort(sorting, &array);
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if (!maxcount || array.nr < maxcount)
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maxcount = array.nr;
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for (i = 0; i < maxcount; i++) {
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strbuf_reset(&err);
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strbuf_reset(&output);
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if (format_ref_array_item(array.items[i], &format, &output, &err))
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die("%s", err.buf);
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fwrite(output.buf, 1, output.len, stdout);
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putchar('\n');
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}
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strbuf_release(&err);
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strbuf_release(&output);
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ref_array_clear(&array);
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return 0;
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}
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