1 files changed, 248 insertions, 0 deletions
diff --git a/builtin/interpret-trailers.c b/builtin/interpret-trailers.c
new file mode 100644
index 0000000000..41b0750e5a
--- /dev/null
+++ b/builtin/interpret-trailers.c
@@ -0,0 +1,248 @@
+/*
+ * Builtin "git interpret-trailers"
+ *
+ * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
+ *
+ */
+#define USE_THE_REPOSITORY_VARIABLE
+#include "builtin.h"
+#include "environment.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"));
+	}
+	strbuf_complete_line(sb);
+}
+
+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_sb = STRBUF_INIT;
+	struct trailer_block *trailer_block;
+	FILE *outfile = stdout;
+
+	trailer_config_init();
+
+	read_input_file(&sb, file);
+
+	if (opts->in_place)
+		outfile = create_in_place_tempfile(file);
+
+	trailer_block = parse_trailers(opts, sb.buf, &head);
+
+	/* Print the lines before the trailer block */
+	if (!opts->only_trailers)
+		fwrite(sb.buf, 1, trailer_block_start(trailer_block), outfile);
+
+	if (!opts->only_trailers && !blank_line_before_trailer_block(trailer_block))
+		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_sb);
+	free_trailers(&head);
+	fwrite(trailer_block_sb.buf, 1, trailer_block_sb.len, outfile);
+	strbuf_release(&trailer_block_sb);
+
+	/* Print the lines after the trailer block as is. */
+	if (!opts->only_trailers)
+		fwrite(sb.buf + trailer_block_end(trailer_block), 1,
+		       sb.len - trailer_block_end(trailer_block), outfile);
+	trailer_block_release(trailer_block);
+
+	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 repository *repo UNUSED)
+{
+	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()
+	};
+
+	repo_config(the_repository, 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;
+}