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bisect--helper: rewrite `check_term_format` shell function in C 

Reimplement the `check_term_format` shell function in C and add
a `--check-term-format` subcommand to `git bisect--helper` to call it
from git-bisect.sh

Using `--check-term-format` subcommand is a temporary measure to port
shell function to C so as to use the existing test suite. As more
functions are ported, this subcommand will be retired and its
implementation will be called by some other method/subcommand. For
eg. In conversion of write_terms() of git-bisect.sh, the subcommand will
be removed and instead check_term_format() will be called in its C
implementation while a new subcommand will be introduced for write_terms().

Helped-by: Johannes Schindelein <Johannes.Schindelein@gmx.de>
Mentored-by: Lars Schneider <larsxschneider@gmail.com>
Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pranit Bauva 2017-09-29 06:49:39 +00:00 committed by Junio C Hamano
parent 9e1c84dfd5
commit 4ba1e5c414
2 changed files with 61 additions and 30 deletions
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60
builtin/bisect--helper.c
View File

@ -2,19 +2,73 @@
#include "cache.h"
#include "parse-options.h"
#include "bisect.h"
#include "refs.h"
static const char * const git_bisect_helper_usage[] = {
N_("git bisect--helper --next-all [--no-checkout]"),
N_("git bisect--helper --check-term-format <term> <orig_term>"),
NULL
};
/*
* Check whether the string `term` belongs to the set of strings
* included in the variable arguments.
*/
LAST_ARG_MUST_BE_NULL
static int one_of(const char *term, ...)
{
int res = 0;
va_list matches;
const char *match;
va_start(matches, term);
while (!res && (match = va_arg(matches, const char *)))
res = !strcmp(term, match);
va_end(matches);
return res;
}
static int check_term_format(const char *term, const char *orig_term)
{
int res;
char *new_term = xstrfmt("refs/bisect/%s", term);
res = check_refname_format(new_term, 0);
free(new_term);
if (res)
return error(_("'%s' is not a valid term"), term);
if (one_of(term, "help", "start", "skip", "next", "reset",
"visualize", "replay", "log", "run", "terms", NULL))
return error(_("can't use the builtin command '%s' as a term"), term);
/*
* In theory, nothing prevents swapping completely good and bad,
* but this situation could be confusing and hasn't been tested
* enough. Forbid it for now.
*/
if ((strcmp(orig_term, "bad") && one_of(term, "bad", "new", NULL)) ||
(strcmp(orig_term, "good") && one_of(term, "good", "old", NULL)))
return error(_("can't change the meaning of the term '%s'"), term);
return 0;
}
int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
{
enum { NEXT_ALL = 1 } cmdmode = 0;
enum {
NEXT_ALL = 1,
CHECK_TERM_FMT
} cmdmode = 0;
int no_checkout = 0;
struct option options[] = {
OPT_CMDMODE(0, "next-all", &cmdmode,
N_("perform 'git bisect next'"), NEXT_ALL),
OPT_CMDMODE(0, "check-term-format", &cmdmode,
N_("check format of the term"), CHECK_TERM_FMT),
OPT_BOOL(0, "no-checkout", &no_checkout,
N_("update BISECT_HEAD instead of checking out the current commit")),
OPT_END()
@ -29,6 +83,10 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
switch (cmdmode) {
case NEXT_ALL:
return bisect_next_all(prefix, no_checkout);
case CHECK_TERM_FMT:
if (argc != 2)
return error(_("--check-term-format requires two arguments"));
return check_term_format(argv[0], argv[1]);
default:
return error("BUG: unknown subcommand '%d'", cmdmode);
}

31
git-bisect.sh
View File

@ -564,38 +564,11 @@ write_terms () {
then
die "$(gettext "please use two different terms")"
fi
check_term_format "$TERM_BAD" bad
check_term_format "$TERM_GOOD" good
git bisect--helper --check-term-format "$TERM_BAD" bad || exit
git bisect--helper --check-term-format "$TERM_GOOD" good || exit
printf '%s\n%s\n' "$TERM_BAD" "$TERM_GOOD" >"$GIT_DIR/BISECT_TERMS"
}
check_term_format () {
term=$1
git check-ref-format refs/bisect/"$term" ||
die "$(eval_gettext "'\$term' is not a valid term")"
case "$term" in
help|start|terms|skip|next|reset|visualize|replay|log|run)
die "$(eval_gettext "can't use the builtin command '\$term' as a term")"
;;
bad|new)
if test "$2" != bad
then
# In theory, nothing prevents swapping
# completely good and bad, but this situation
# could be confusing and hasn't been tested
# enough. Forbid it for now.
die "$(eval_gettext "can't change the meaning of term '\$term'")"
fi
;;
good|old)
if test "$2" != good
then
die "$(eval_gettext "can't change the meaning of term '\$term'")"
fi
;;
esac
}
check_and_set_terms () {
cmd="$1"
case "$cmd" in