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/*
* Builtin "git interpret-trailers"
*
* Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
*
*/
#include "builtin.h"
#include "gettext.h"
#include "parse-options.h"
#include "string-list.h"
#include "tempfile.h"
#include "trailer.h"
#include "config.h"
static const char * const git_interpret_trailers_usage[] = {
N_("git interpret-trailers [--in-place] [--trim-empty]\n"
" [(--trailer (<key>|<key-alias>)[(=|:)<value>])...]\n"
" [--parse] [<file>...]"),
NULL
};
static enum trailer_where where;
static enum trailer_if_exists if_exists;
static enum trailer_if_missing if_missing;
static int option_parse_where(const struct option *opt,
const char *arg, int unset UNUSED)
{
/* unset implies NULL arg, which is handled in our helper */
return trailer_set_where(opt->value, arg);
}
static int option_parse_if_exists(const struct option *opt,
const char *arg, int unset UNUSED)
{
/* unset implies NULL arg, which is handled in our helper */
return trailer_set_if_exists(opt->value, arg);
}
static int option_parse_if_missing(const struct option *opt,
const char *arg, int unset UNUSED)
{
/* unset implies NULL arg, which is handled in our helper */
return trailer_set_if_missing(opt->value, arg);
}
static void new_trailers_clear(struct list_head *trailers)
{
struct list_head *pos, *tmp;
struct new_trailer_item *item;
list_for_each_safe(pos, tmp, trailers) {
item = list_entry(pos, struct new_trailer_item, list);
list_del(pos);
free(item);
}
}
static int option_parse_trailer(const struct option *opt,
const char *arg, int unset)
{
struct list_head *trailers = opt->value;
struct new_trailer_item *item;
if (unset) {
new_trailers_clear(trailers);
return 0;
}
if (!arg)
return -1;
item = xmalloc(sizeof(*item));
item->text = arg;
item->where = where;
item->if_exists = if_exists;
item->if_missing = if_missing;
list_add_tail(&item->list, trailers);
return 0;
}
static int parse_opt_parse(const struct option *opt, const char *arg,
int unset)
{
struct process_trailer_options *v = opt->value;
v->only_trailers = 1;
v->only_input = 1;
v->unfold = 1;
BUG_ON_OPT_NEG(unset);
BUG_ON_OPT_ARG(arg);
return 0;
}
static struct tempfile *trailers_tempfile;
static FILE *create_in_place_tempfile(const char *file)
{
struct stat st;
struct strbuf filename_template = STRBUF_INIT;
const char *tail;
FILE *outfile;
if (stat(file, &st))
die_errno(_("could not stat %s"), file);
if (!S_ISREG(st.st_mode))
die(_("file %s is not a regular file"), file);
if (!(st.st_mode & S_IWUSR))
die(_("file %s is not writable by user"), file);
/* Create temporary file in the same directory as the original */
tail = strrchr(file, '/');
if (tail)
strbuf_add(&filename_template, file, tail - file + 1);
strbuf_addstr(&filename_template, "git-interpret-trailers-XXXXXX");
trailers_tempfile = xmks_tempfile_m(filename_template.buf, st.st_mode);
strbuf_release(&filename_template);
outfile = fdopen_tempfile(trailers_tempfile, "w");
if (!outfile)
die_errno(_("could not open temporary file"));
return outfile;
}
static void read_input_file(struct strbuf *sb, const char *file)
{
if (file) {
if (strbuf_read_file(sb, file, 0) < 0)
die_errno(_("could not read input file '%s'"), file);
} else {
if (strbuf_read(sb, fileno(stdin), 0) < 0)
die_errno(_("could not read from stdin"));
}
}
static void interpret_trailers(const struct process_trailer_options *opts,
struct list_head *new_trailer_head,
const char *file)
{
LIST_HEAD(head);
struct strbuf sb = STRBUF_INIT;
struct strbuf trailer_block = STRBUF_INIT;
struct trailer_info info;
FILE *outfile = stdout;
trailer_config_init();
read_input_file(&sb, file);
if (opts->in_place)
outfile = create_in_place_tempfile(file);
parse_trailers(opts, &info, sb.buf, &head);
/* Print the lines before the trailers */
if (!opts->only_trailers)
fwrite(sb.buf, 1, info.trailer_block_start, outfile);
if (!opts->only_trailers && !info.blank_line_before_trailer)
fprintf(outfile, "\n");
if (!opts->only_input) {
LIST_HEAD(config_head);
LIST_HEAD(arg_head);
parse_trailers_from_config(&config_head);
parse_trailers_from_command_line_args(&arg_head, new_trailer_head);
list_splice(&config_head, &arg_head);
process_trailers_lists(&head, &arg_head);
}
/* Print trailer block. */
format_trailers(opts, &head, &trailer_block);
free_trailers(&head);
fwrite(trailer_block.buf, 1, trailer_block.len, outfile);
strbuf_release(&trailer_block);
/* Print the lines after the trailers as is */
if (!opts->only_trailers)
fwrite(sb.buf + info.trailer_block_end, 1, sb.len - info.trailer_block_end, outfile);
trailer_info_release(&info);
if (opts->in_place)
if (rename_tempfile(&trailers_tempfile, file))
die_errno(_("could not rename temporary file to %s"), file);
strbuf_release(&sb);
}
int cmd_interpret_trailers(int argc, const char **argv, const char *prefix)
{
struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
LIST_HEAD(trailers);
struct option options[] = {
OPT_BOOL(0, "in-place", &opts.in_place, N_("edit files in place")),
OPT_BOOL(0, "trim-empty", &opts.trim_empty, N_("trim empty trailers")),
OPT_CALLBACK(0, "where", &where, N_("placement"),
N_("where to place the new trailer"), option_parse_where),
OPT_CALLBACK(0, "if-exists", &if_exists, N_("action"),
N_("action if trailer already exists"), option_parse_if_exists),
OPT_CALLBACK(0, "if-missing", &if_missing, N_("action"),
N_("action if trailer is missing"), option_parse_if_missing),
OPT_BOOL(0, "only-trailers", &opts.only_trailers, N_("output only the trailers")),
OPT_BOOL(0, "only-input", &opts.only_input, N_("do not apply trailer.* configuration variables")),
OPT_BOOL(0, "unfold", &opts.unfold, N_("reformat multiline trailer values as single-line values")),
OPT_CALLBACK_F(0, "parse", &opts, NULL, N_("alias for --only-trailers --only-input --unfold"),
PARSE_OPT_NOARG | PARSE_OPT_NONEG, parse_opt_parse),
OPT_BOOL(0, "no-divider", &opts.no_divider, N_("do not treat \"---\" as the end of input")),
OPT_CALLBACK(0, "trailer", &trailers, N_("trailer"),
N_("trailer(s) to add"), option_parse_trailer),
OPT_END()
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options,
git_interpret_trailers_usage, 0);
if (opts.only_input && !list_empty(&trailers))
usage_msg_opt(
_("--trailer with --only-input does not make sense"),
git_interpret_trailers_usage,
options);
if (argc) {
int i;
for (i = 0; i < argc; i++)
interpret_trailers(&opts, &trailers, argv[i]);
} else {
if (opts.in_place)
die(_("no input file given for in-place editing"));
interpret_trailers(&opts, &trailers, NULL);
}
new_trailers_clear(&trailers);
return 0;
}
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