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parse-options: deprecate OPT_BOOLEAN

It is natural to expect that an option defined with OPT_BOOLEAN() could be
used in this way:

	int option = -1; /* unspecified */

	struct option options[] = {
		OPT_BOOLEAN(0, "option", &option, "set option"),
                OPT_END()
	};
	parse_options(ac, av, prefix, options, usage, 0);

        if (option < 0)
        	... do the default thing ...
	else if (!option)
		... --no-option was given ...
	else
		... --option was given ...

to easily tell three cases apart:

 - There is no mention of the `--option` on the command line;
 - The variable is positively set with `--option`; or
 - The variable is explicitly negated with `--no-option`.

Unfortunately, this is not the case. OPT_BOOLEAN() increments the variable
every time `--option` is given, and resets it to zero when `--no-option`
is given.

As a first step to remedy this, introduce a true boolean OPT_BOOL(), and
rename OPT_BOOLEAN() to OPT_COUNTUP(). To help transitioning, OPT_BOOLEAN
and OPTION_BOOLEAN are defined as deprecated synonyms to OPT_COUNTUP and
OPTION_COUNTUP respectively.

This is what db7244b (parse-options new features., 2007-11-07) from four
years ago started by marking OPTION_BOOLEAN as "INCR would have been a
better name".

Some existing users do depend on the count-up semantics; for example,
users of OPT__VERBOSE() could use it to raise the verbosity level with
repeated use of `-v` on the command line, but they probably should be
rewritten to use OPT__VERBOSITY() instead these days.  I suspect that some
users of OPT__FORCE() may also use it to implement different level of
forcibleness but I didn't check.

On top of this patch, here are the remaining clean-up tasks that other
people can help:

 - Look at each hit in "git grep -e OPT_BOOLEAN"; trace all uses of the
   value that is set to the underlying variable, and if it can proven that
   the variable is only used as a boolean, replace it with OPT_BOOL(). If
   the caller does depend on the count-up semantics, replace it with
   OPT_COUNTUP() instead.

 - Same for OPTION_BOOLEAN; replace it with OPTION_SET_INT and arrange to
   set 1 to the variable for a true boolean, and otherwise replace it with
   OPTION_COUNTUP.

 - Look at each hit in "git grep -e OPT__VERBOSE -e OPT__QUIET" and see if
   they can be replaced with OPT__VERBOSITY().

I'll follow this message up with a separate patch as an example.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
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gitster committed Sep 27, 2011
1 parent 8d714b1 commit b04ba2bb42957f63567f530e092385f085b25e63
Showing with 21 additions and 9 deletions.
  1. +11 −5 Documentation/technical/api-parse-options.txt
  2. +2 −2 parse-options.c
  3. +8 −2 parse-options.h
@@ -135,9 +135,14 @@ There are some macros to easily define options:
describes the group or an empty string.
Start the description with an upper-case letter.
-`OPT_BOOLEAN(short, long, &int_var, description)`::
- Introduce a boolean option.
- `int_var` is incremented on each use.
+`OPT_BOOL(short, long, &int_var, description)`::
+ Introduce a boolean option. `int_var` is set to one with
+ `--option` and set to zero with `--no-option`.
+
+`OPT_COUNTUP(short, long, &int_var, description)`::
+ Introduce a count-up option.
+ `int_var` is incremented on each use of `--option`, and
+ reset to zero with `--no-option`.
`OPT_BIT(short, long, &int_var, description, mask)`::
Introduce a boolean option.
@@ -148,8 +153,9 @@ There are some macros to easily define options:
If used, `int_var` is bitwise-anded with the inverted `mask`.
`OPT_SET_INT(short, long, &int_var, description, integer)`::
- Introduce a boolean option.
- If used, set `int_var` to `integer`.
+ Introduce an integer option.
+ `int_var` is set to `integer` with `--option`, and
+ reset to zero with `--no-option`.
`OPT_SET_PTR(short, long, &ptr_var, description, ptr)`::
Introduce a boolean option.
View
@@ -83,7 +83,7 @@ static int get_value(struct parse_opt_ctx_t *p,
*(int *)opt->value &= ~opt->defval;
return 0;
- case OPTION_BOOLEAN:
+ case OPTION_COUNTUP:
*(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
return 0;
@@ -319,7 +319,7 @@ static void parse_options_check(const struct option *opts)
err |= optbug(opts, "uses feature "
"not supported for dashless options");
switch (opts->type) {
- case OPTION_BOOLEAN:
+ case OPTION_COUNTUP:
case OPTION_BIT:
case OPTION_NEGBIT:
case OPTION_SET_INT:
View
@@ -10,7 +10,7 @@ enum parse_opt_type {
/* options with no arguments */
OPTION_BIT,
OPTION_NEGBIT,
- OPTION_BOOLEAN, /* _INCR would have been a better name */
+ OPTION_COUNTUP,
OPTION_SET_INT,
OPTION_SET_PTR,
/* options with arguments (usually) */
@@ -21,6 +21,9 @@ enum parse_opt_type {
OPTION_FILENAME
};
+/* Deprecated synonym */
+#define OPTION_BOOLEAN OPTION_COUNTUP
+
enum parse_opt_flags {
PARSE_OPT_KEEP_DASHDASH = 1,
PARSE_OPT_STOP_AT_NON_OPTION = 2,
@@ -122,10 +125,11 @@ struct option {
PARSE_OPT_NOARG, NULL, (b) }
#define OPT_NEGBIT(s, l, v, h, b) { OPTION_NEGBIT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (b) }
-#define OPT_BOOLEAN(s, l, v, h) { OPTION_BOOLEAN, (s), (l), (v), NULL, \
+#define OPT_COUNTUP(s, l, v, h) { OPTION_COUNTUP, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG }
#define OPT_SET_INT(s, l, v, h, i) { OPTION_SET_INT, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (i) }
+#define OPT_BOOL(s, l, v, h) OPT_SET_INT(s, l, v, h, 1)
#define OPT_SET_PTR(s, l, v, h, p) { OPTION_SET_PTR, (s), (l), (v), NULL, \
(h), PARSE_OPT_NOARG, NULL, (p) }
#define OPT_INTEGER(s, l, v, h) { OPTION_INTEGER, (s), (l), (v), "n", (h) }
@@ -149,6 +153,8 @@ struct option {
{ OPTION_CALLBACK, (s), (l), (v), "when", (h), PARSE_OPT_OPTARG, \
parse_opt_color_flag_cb, (intptr_t)"always" }
+/* Deprecated synonym */
+#define OPT_BOOLEAN OPT_COUNTUP
/* parse_options() will filter out the processed options and leave the
* non-option arguments in argv[].

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