freshlybakedca.ke
Git fork
1/*
2 * Builtin "git interpret-trailers"
3 *
4 * Copyright (c) 2013, 2014 Christian Couder <chriscool@tuxfamily.org>
5 *
6 */
7#define USE_THE_REPOSITORY_VARIABLE
8#include "builtin.h"
9#include "environment.h"
10#include "gettext.h"
11#include "parse-options.h"
12#include "string-list.h"
13#include "tempfile.h"
14#include "trailer.h"
15#include "config.h"
16
17static const char * const git_interpret_trailers_usage[] = {
18 N_("git interpret-trailers [--in-place] [--trim-empty]\n"
19 " [(--trailer (<key>|<key-alias>)[(=|:)<value>])...]\n"
20 " [--parse] [<file>...]"),
21 NULL
22};
23
24static enum trailer_where where;
25static enum trailer_if_exists if_exists;
26static enum trailer_if_missing if_missing;
27
28static int option_parse_where(const struct option *opt,
29 const char *arg, int unset UNUSED)
30{
31 /* unset implies NULL arg, which is handled in our helper */
32 return trailer_set_where(opt->value, arg);
33}
34
35static int option_parse_if_exists(const struct option *opt,
36 const char *arg, int unset UNUSED)
37{
38 /* unset implies NULL arg, which is handled in our helper */
39 return trailer_set_if_exists(opt->value, arg);
40}
41
42static int option_parse_if_missing(const struct option *opt,
43 const char *arg, int unset UNUSED)
44{
45 /* unset implies NULL arg, which is handled in our helper */
46 return trailer_set_if_missing(opt->value, arg);
47}
48
49static void new_trailers_clear(struct list_head *trailers)
50{
51 struct list_head *pos, *tmp;
52 struct new_trailer_item *item;
53
54 list_for_each_safe(pos, tmp, trailers) {
55 item = list_entry(pos, struct new_trailer_item, list);
56 list_del(pos);
57 free(item);
58 }
59}
60
61static int option_parse_trailer(const struct option *opt,
62 const char *arg, int unset)
63{
64 struct list_head *trailers = opt->value;
65 struct new_trailer_item *item;
66
67 if (unset) {
68 new_trailers_clear(trailers);
69 return 0;
70 }
71
72 if (!arg)
73 return -1;
74
75 item = xmalloc(sizeof(*item));
76 item->text = arg;
77 item->where = where;
78 item->if_exists = if_exists;
79 item->if_missing = if_missing;
80 list_add_tail(&item->list, trailers);
81 return 0;
82}
83
84static int parse_opt_parse(const struct option *opt, const char *arg,
85 int unset)
86{
87 struct process_trailer_options *v = opt->value;
88 v->only_trailers = 1;
89 v->only_input = 1;
90 v->unfold = 1;
91 BUG_ON_OPT_NEG(unset);
92 BUG_ON_OPT_ARG(arg);
93 return 0;
94}
95
96static struct tempfile *trailers_tempfile;
97
98static FILE *create_in_place_tempfile(const char *file)
99{
100 struct stat st;
101 struct strbuf filename_template = STRBUF_INIT;
102 const char *tail;
103 FILE *outfile;
104
105 if (stat(file, &st))
106 die_errno(_("could not stat %s"), file);
107 if (!S_ISREG(st.st_mode))
108 die(_("file %s is not a regular file"), file);
109 if (!(st.st_mode & S_IWUSR))
110 die(_("file %s is not writable by user"), file);
111
112 /* Create temporary file in the same directory as the original */
113 tail = strrchr(file, '/');
114 if (tail)
115 strbuf_add(&filename_template, file, tail - file + 1);
116 strbuf_addstr(&filename_template, "git-interpret-trailers-XXXXXX");
117
118 trailers_tempfile = xmks_tempfile_m(filename_template.buf, st.st_mode);
119 strbuf_release(&filename_template);
120 outfile = fdopen_tempfile(trailers_tempfile, "w");
121 if (!outfile)
122 die_errno(_("could not open temporary file"));
123
124 return outfile;
125}
126
127static void read_input_file(struct strbuf *sb, const char *file)
128{
129 if (file) {
130 if (strbuf_read_file(sb, file, 0) < 0)
131 die_errno(_("could not read input file '%s'"), file);
132 } else {
133 if (strbuf_read(sb, fileno(stdin), 0) < 0)
134 die_errno(_("could not read from stdin"));
135 }
136 strbuf_complete_line(sb);
137}
138
139static void interpret_trailers(const struct process_trailer_options *opts,
140 struct list_head *new_trailer_head,
141 const char *file)
142{
143 LIST_HEAD(head);
144 struct strbuf sb = STRBUF_INIT;
145 struct strbuf trailer_block_sb = STRBUF_INIT;
146 struct trailer_block *trailer_block;
147 FILE *outfile = stdout;
148
149 trailer_config_init();
150
151 read_input_file(&sb, file);
152
153 if (opts->in_place)
154 outfile = create_in_place_tempfile(file);
155
156 trailer_block = parse_trailers(opts, sb.buf, &head);
157
158 /* Print the lines before the trailer block */
159 if (!opts->only_trailers)
160 fwrite(sb.buf, 1, trailer_block_start(trailer_block), outfile);
161
162 if (!opts->only_trailers && !blank_line_before_trailer_block(trailer_block))
163 fprintf(outfile, "\n");
164
165
166 if (!opts->only_input) {
167 LIST_HEAD(config_head);
168 LIST_HEAD(arg_head);
169 parse_trailers_from_config(&config_head);
170 parse_trailers_from_command_line_args(&arg_head, new_trailer_head);
171 list_splice(&config_head, &arg_head);
172 process_trailers_lists(&head, &arg_head);
173 }
174
175 /* Print trailer block. */
176 format_trailers(opts, &head, &trailer_block_sb);
177 free_trailers(&head);
178 fwrite(trailer_block_sb.buf, 1, trailer_block_sb.len, outfile);
179 strbuf_release(&trailer_block_sb);
180
181 /* Print the lines after the trailer block as is. */
182 if (!opts->only_trailers)
183 fwrite(sb.buf + trailer_block_end(trailer_block), 1,
184 sb.len - trailer_block_end(trailer_block), outfile);
185 trailer_block_release(trailer_block);
186
187 if (opts->in_place)
188 if (rename_tempfile(&trailers_tempfile, file))
189 die_errno(_("could not rename temporary file to %s"), file);
190
191 strbuf_release(&sb);
192}
193
194int cmd_interpret_trailers(int argc,
195 const char **argv,
196 const char *prefix,
197 struct repository *repo UNUSED)
198{
199 struct process_trailer_options opts = PROCESS_TRAILER_OPTIONS_INIT;
200 LIST_HEAD(trailers);
201
202 struct option options[] = {
203 OPT_BOOL(0, "in-place", &opts.in_place, N_("edit files in place")),
204 OPT_BOOL(0, "trim-empty", &opts.trim_empty, N_("trim empty trailers")),
205
206 OPT_CALLBACK(0, "where", &where, N_("placement"),
207 N_("where to place the new trailer"), option_parse_where),
208 OPT_CALLBACK(0, "if-exists", &if_exists, N_("action"),
209 N_("action if trailer already exists"), option_parse_if_exists),
210 OPT_CALLBACK(0, "if-missing", &if_missing, N_("action"),
211 N_("action if trailer is missing"), option_parse_if_missing),
212
213 OPT_BOOL(0, "only-trailers", &opts.only_trailers, N_("output only the trailers")),
214 OPT_BOOL(0, "only-input", &opts.only_input, N_("do not apply trailer.* configuration variables")),
215 OPT_BOOL(0, "unfold", &opts.unfold, N_("reformat multiline trailer values as single-line values")),
216 OPT_CALLBACK_F(0, "parse", &opts, NULL, N_("alias for --only-trailers --only-input --unfold"),
217 PARSE_OPT_NOARG | PARSE_OPT_NONEG, parse_opt_parse),
218 OPT_BOOL(0, "no-divider", &opts.no_divider, N_("do not treat \"---\" as the end of input")),
219 OPT_CALLBACK(0, "trailer", &trailers, N_("trailer"),
220 N_("trailer(s) to add"), option_parse_trailer),
221 OPT_END()
222 };
223
224 repo_config(the_repository, git_default_config, NULL);
225
226 argc = parse_options(argc, argv, prefix, options,
227 git_interpret_trailers_usage, 0);
228
229 if (opts.only_input && !list_empty(&trailers))
230 usage_msg_opt(
231 _("--trailer with --only-input does not make sense"),
232 git_interpret_trailers_usage,
233 options);
234
235 if (argc) {
236 int i;
237 for (i = 0; i < argc; i++)
238 interpret_trailers(&opts, &trailers, argv[i]);
239 } else {
240 if (opts.in_place)
241 die(_("no input file given for in-place editing"));
242 interpret_trailers(&opts, &trailers, NULL);
243 }
244
245 new_trailers_clear(&trailers);
246
247 return 0;
248}