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![Jeff King](/assets/img/avatar_default.png)
There are a few parse-option callbacks that do not look at their "unset" parameters, but also do not set PARSE_OPT_NONEG. At first glance this seems like a bug, as we'd ignore "--no-if-exists", etc. But they do work fine, because when "unset" is true, then "arg" is NULL. And all three functions pass "arg" on to helper functions which do the right thing with the NULL. Note that this shortcut would not be correct if any callback used PARSE_OPT_NOARG (in which case "arg" would be NULL but "unset" would be false). But none of these do. So the code is fine as-is. But we'll want to mark the unused "unset" parameters to quiet -Wunused-parameter. I've also added a comment to make this rather subtle situation more explicit. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
146 lines
4 KiB
C
146 lines
4 KiB
C
/*
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* Builtin "git interpret-trailers"
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*
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* Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
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*
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*/
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#include "builtin.h"
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#include "gettext.h"
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#include "parse-options.h"
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#include "string-list.h"
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#include "trailer.h"
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#include "config.h"
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static const char * const git_interpret_trailers_usage[] = {
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N_("git interpret-trailers [--in-place] [--trim-empty]\n"
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" [(--trailer <token>[(=|:)<value>])...]\n"
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" [--parse] [<file>...]"),
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NULL
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};
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static enum trailer_where where;
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static enum trailer_if_exists if_exists;
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static enum trailer_if_missing if_missing;
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static int option_parse_where(const struct option *opt,
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const char *arg, int unset UNUSED)
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{
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/* unset implies NULL arg, which is handled in our helper */
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return trailer_set_where(opt->value, arg);
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}
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static int option_parse_if_exists(const struct option *opt,
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const char *arg, int unset UNUSED)
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{
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/* unset implies NULL arg, which is handled in our helper */
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return trailer_set_if_exists(opt->value, arg);
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}
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static int option_parse_if_missing(const struct option *opt,
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const char *arg, int unset UNUSED)
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{
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/* unset implies NULL arg, which is handled in our helper */
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return trailer_set_if_missing(opt->value, arg);
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}
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static void new_trailers_clear(struct list_head *trailers)
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{
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struct list_head *pos, *tmp;
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struct new_trailer_item *item;
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list_for_each_safe(pos, tmp, trailers) {
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item = list_entry(pos, struct new_trailer_item, list);
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list_del(pos);
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free(item);
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}
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}
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static int option_parse_trailer(const struct option *opt,
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const char *arg, int unset)
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{
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struct list_head *trailers = opt->value;
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struct new_trailer_item *item;
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if (unset) {
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new_trailers_clear(trailers);
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return 0;
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}
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if (!arg)
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return -1;
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item = xmalloc(sizeof(*item));
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item->text = arg;
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item->where = where;
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item->if_exists = if_exists;
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item->if_missing = if_missing;
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list_add_tail(&item->list, trailers);
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return 0;
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}
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static int parse_opt_parse(const struct option *opt, const char *arg,
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int unset)
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{
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struct process_trailer_options *v = opt->value;
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v->only_trailers = 1;
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v->only_input = 1;
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v->unfold = 1;
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BUG_ON_OPT_NEG(unset);
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BUG_ON_OPT_ARG(arg);
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return 0;
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}
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int cmd_interpret_trailers(int argc, const char **argv, const char *prefix)
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{
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struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
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LIST_HEAD(trailers);
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struct option options[] = {
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OPT_BOOL(0, "in-place", &opts.in_place, N_("edit files in place")),
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OPT_BOOL(0, "trim-empty", &opts.trim_empty, N_("trim empty trailers")),
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OPT_CALLBACK(0, "where", &where, N_("action"),
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N_("where to place the new trailer"), option_parse_where),
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OPT_CALLBACK(0, "if-exists", &if_exists, N_("action"),
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N_("action if trailer already exists"), option_parse_if_exists),
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OPT_CALLBACK(0, "if-missing", &if_missing, N_("action"),
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N_("action if trailer is missing"), option_parse_if_missing),
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OPT_BOOL(0, "only-trailers", &opts.only_trailers, N_("output only the trailers")),
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OPT_BOOL(0, "only-input", &opts.only_input, N_("do not apply config rules")),
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OPT_BOOL(0, "unfold", &opts.unfold, N_("join whitespace-continued values")),
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OPT_CALLBACK_F(0, "parse", &opts, NULL, N_("set parsing options"),
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PARSE_OPT_NOARG | PARSE_OPT_NONEG, parse_opt_parse),
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OPT_BOOL(0, "no-divider", &opts.no_divider, N_("do not treat --- specially")),
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OPT_CALLBACK(0, "trailer", &trailers, N_("trailer"),
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N_("trailer(s) to add"), option_parse_trailer),
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OPT_END()
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};
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, options,
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git_interpret_trailers_usage, 0);
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if (opts.only_input && !list_empty(&trailers))
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usage_msg_opt(
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_("--trailer with --only-input does not make sense"),
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git_interpret_trailers_usage,
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options);
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if (argc) {
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int i;
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for (i = 0; i < argc; i++)
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process_trailers(argv[i], &opts, &trailers);
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} else {
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if (opts.in_place)
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die(_("no input file given for in-place editing"));
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process_trailers(NULL, &opts, &trailers);
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}
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new_trailers_clear(&trailers);
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return 0;
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}
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