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Add a parseopt mode to git-rev-parse to bring parse-options to shell scripts.
Signed-off-by: Pierre Habouzit <madcoder@debian.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pierre Habouzit
Junio C Hamano
parent
fe61935007
commit
21d4783538
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@ -23,6 +23,13 @@ distinguish between them.
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OPTIONS
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-------
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--parseopt::
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Use `git-rev-parse` in option parsing mode (see PARSEOPT section below).
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--keep-dash-dash::
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Only meaningful in `--parseopt` mode. Tells the option parser to echo
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out the first `--` met instead of skipping it.
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--revs-only::
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Do not output flags and parameters not meant for
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`git-rev-list` command.
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@ -288,10 +295,75 @@ Here are a handful examples:
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C^@ I J F
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F^! D G H D F
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PARSEOPT
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--------
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In `--parseopt` mode, `git-rev-parse` helps massaging options to bring to shell
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scripts the same facilities C builtins have. It works as an option normalizer
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(e.g. splits single switches aggregate values), a bit like `getopt(1)` does.
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It takes on the standard input the specification of the options to parse and
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understand, and echoes on the standard output a line suitable for `sh(1)` `eval`
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to replace the arguments with normalized ones. In case of error, it outputs
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usage on the standard error stream, and exits with code 129.
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Input Format
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~~~~~~~~~~~~
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`git-rev-parse --parseopt` input format is fully text based. It has two parts,
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separated by a line that contains only `--`. The lines before the separator
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(should be more than one) are used for the usage.
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The lines after the separator describe the options.
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Each line of options has this format:
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------------
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<opt_spec><arg_spec>? SP+ help LF
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------------
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`<opt_spec>`::
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its format is the short option character, then the long option name
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separated by a comma. Both parts are not required, though at least one
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is necessary. `h,help`, `dry-run` and `f` are all three correct
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`<opt_spec>`.
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`<arg_spec>`::
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an `<arg_spec>` tells the option parser if the option has an argument
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(`=`), an optional one (`?` though its use is discouraged) or none
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(no `<arg_spec>` in that case).
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The remainder of the line, after stripping the spaces, is used
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as the help associated to the option.
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Blank lines are ignored, and lines that don't match this specification are used
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as option group headers (start the line with a space to create such
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lines on purpose).
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Example
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~~~~~~~
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------------
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OPTS_SPEC="\
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some-command [options] <args>...
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some-command does foo and bar!
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--
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h,help show the help
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foo some nifty option --foo
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bar= some cool option --bar with an argument
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An option group Header
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C? option C with an optional argument"
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eval `echo "$OPTS_SPEC" | git-rev-parse --parseopt -- "$@" || echo exit $?`
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------------
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org> and
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Junio C Hamano <junkio@cox.net>
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Written by Linus Torvalds <torvalds@osdl.org> .
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Junio C Hamano <junkio@cox.net> and Pierre Habouzit <madcoder@debian.org>
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Documentation
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--------------
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@ -8,6 +8,7 @@
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#include "refs.h"
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#include "quote.h"
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#include "builtin.h"
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#include "parse-options.h"
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#define DO_REVS 1
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#define DO_NOREV 2
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@ -209,6 +210,128 @@ static int try_difference(const char *arg)
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return 0;
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}
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static int parseopt_dump(const struct option *o, const char *arg, int unset)
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{
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struct strbuf *parsed = o->value;
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if (unset)
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strbuf_addf(parsed, " --no-%s", o->long_name);
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else if (o->short_name)
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strbuf_addf(parsed, " -%c", o->short_name);
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else
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strbuf_addf(parsed, " --%s", o->long_name);
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if (arg) {
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strbuf_addch(parsed, ' ');
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sq_quote_buf(parsed, arg);
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}
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return 0;
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}
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static const char *skipspaces(const char *s)
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{
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while (isspace(*s))
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s++;
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return s;
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}
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static int cmd_parseopt(int argc, const char **argv, const char *prefix)
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{
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static int keep_dashdash = 0;
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static char const * const parseopt_usage[] = {
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"git-rev-parse --parseopt [options] -- [<args>...]",
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NULL
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};
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static struct option parseopt_opts[] = {
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OPT_BOOLEAN(0, "keep-dashdash", &keep_dashdash,
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"keep the `--` passed as an arg"),
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OPT_END(),
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};
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struct strbuf sb, parsed;
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const char **usage = NULL;
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struct option *opts = NULL;
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int onb = 0, osz = 0, unb = 0, usz = 0;
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strbuf_init(&parsed, 0);
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strbuf_addstr(&parsed, "set --");
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argc = parse_options(argc, argv, parseopt_opts, parseopt_usage,
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PARSE_OPT_KEEP_DASHDASH);
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if (argc < 1 || strcmp(argv[0], "--"))
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usage_with_options(parseopt_usage, parseopt_opts);
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strbuf_init(&sb, 0);
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/* get the usage up to the first line with a -- on it */
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for (;;) {
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if (strbuf_getline(&sb, stdin, '\n') == EOF)
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die("premature end of input");
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ALLOC_GROW(usage, unb + 1, usz);
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if (!strcmp("--", sb.buf)) {
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if (unb < 1)
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die("no usage string given before the `--' separator");
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usage[unb] = NULL;
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break;
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}
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usage[unb++] = strbuf_detach(&sb, NULL);
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}
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/* parse: (<short>|<short>,<long>|<long>)[=?]? SP+ <help> */
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while (strbuf_getline(&sb, stdin, '\n') != EOF) {
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const char *s;
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struct option *o;
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if (!sb.len)
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continue;
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ALLOC_GROW(opts, onb + 1, osz);
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memset(opts + onb, 0, sizeof(opts[onb]));
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o = &opts[onb++];
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s = strchr(sb.buf, ' ');
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if (!s || *sb.buf == ' ') {
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o->type = OPTION_GROUP;
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o->help = xstrdup(skipspaces(s));
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continue;
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}
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o->type = OPTION_CALLBACK;
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o->help = xstrdup(skipspaces(s));
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o->value = &parsed;
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o->callback = &parseopt_dump;
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switch (s[-1]) {
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case '=':
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s--;
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break;
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case '?':
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o->flags = PARSE_OPT_OPTARG;
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s--;
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break;
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default:
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o->flags = PARSE_OPT_NOARG;
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break;
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}
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if (s - sb.buf == 1) /* short option only */
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o->short_name = *sb.buf;
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else if (sb.buf[1] != ',') /* long option only */
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o->long_name = xmemdupz(sb.buf, s - sb.buf);
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else {
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o->short_name = *sb.buf;
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o->long_name = xmemdupz(sb.buf + 2, s - sb.buf - 2);
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}
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}
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strbuf_release(&sb);
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/* put an OPT_END() */
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ALLOC_GROW(opts, onb + 1, osz);
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memset(opts + onb, 0, sizeof(opts[onb]));
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argc = parse_options(argc, argv, opts, usage,
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keep_dashdash ? PARSE_OPT_KEEP_DASHDASH : 0);
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strbuf_addf(&parsed, " --");
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sq_quote_argv(&parsed, argv, argc, 0);
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puts(parsed.buf);
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return 0;
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}
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int cmd_rev_parse(int argc, const char **argv, const char *prefix)
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{
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int i, as_is = 0, verify = 0;
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@ -216,6 +339,9 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
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git_config(git_default_config);
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if (argc > 1 && !strcmp("--parseopt", argv[1]))
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return cmd_parseopt(argc - 1, argv + 1, prefix);
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for (i = 1; i < argc; i++) {
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const char *arg = argv[i];
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