parse-options new features.

options flags:
~~~~~~~~~~~~~
PARSE_OPT_NONEG allow the caller to disallow the negated option to exists.

option types:
~~~~~~~~~~~~
OPTION_BIT: ORs (or NANDs) a mask.
OPTION_SET_INT: force the value to be set to this integer.
OPTION_SET_PTR: force the value to be set to this pointer.

helper:
~~~~~~
HAS_MULTI_BITS (in git-compat-util.h) is a bit-hack to check if an
unsigned integer has more than one bit set, useful to check if conflicting
options have been used.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-compat-util.h b/git-compat-util.h
index 7b29d1b905c618a50704a7b2c38041f71c942e71..f86b19f162fdc64daf88e5013efe0c90be3f6c1c 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -20,6 +20,7 @@
 #endif
 
 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
+#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 
 /* Approximation of the length of the decimal representation of this type. */
 #define decimal_length(x)      ((int)(sizeof(x) * 2.56 + 0.5) + 1)

diff --git a/parse-options.c b/parse-options.c
index 15b32f741b6b8bf47321b9ce78da43e9378f22b3..d3e608ac45e2a0c6accb9d27ed8d407619cb70d2 100644 (file)
--- a/parse-options.c
+++ b/parse-options.c
@@ -40,24 +40,53 @@ static int get_value(struct optparse_t *p,
                      const struct option *opt, int flags)
 {
        const char *s, *arg;
-       arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
+       const int unset = flags & OPT_UNSET;
 
-       if (p->opt && (flags & OPT_UNSET))
+       if (unset && p->opt)
                return opterror(opt, "takes no value", flags);
+       if (unset && (opt->flags & PARSE_OPT_NONEG))
+               return opterror(opt, "isn't available", flags);
 
-       switch (opt->type) {
-       case OPTION_BOOLEAN:
-               if (!(flags & OPT_SHORT) && p->opt)
+       if (!(flags & OPT_SHORT) && p->opt) {
+               switch (opt->type) {
+               case OPTION_CALLBACK:
+                       if (!(opt->flags & PARSE_OPT_NOARG))
+                               break;
+                       /* FALLTHROUGH */
+               case OPTION_BOOLEAN:
+               case OPTION_BIT:
+               case OPTION_SET_INT:
+               case OPTION_SET_PTR:
                        return opterror(opt, "takes no value", flags);
-               if (flags & OPT_UNSET)
-                       *(int *)opt->value = 0;
+               default:
+                       break;
+               }
+       }
+
+       arg = p->opt ? p->opt : (p->argc > 1 ? p->argv[1] : NULL);
+       switch (opt->type) {
+       case OPTION_BIT:
+               if (unset)
+                       *(int *)opt->value &= ~opt->defval;
                else
-                       (*(int *)opt->value)++;
+                       *(int *)opt->value |= opt->defval;
+               return 0;
+
+       case OPTION_BOOLEAN:
+               *(int *)opt->value = unset ? 0 : *(int *)opt->value + 1;
+               return 0;
+
+       case OPTION_SET_INT:
+               *(int *)opt->value = unset ? 0 : opt->defval;
+               return 0;
+
+       case OPTION_SET_PTR:
+               *(void **)opt->value = unset ? NULL : (void *)opt->defval;
                return 0;
 
        case OPTION_STRING:
-               if (flags & OPT_UNSET) {
-                       *(const char **)opt->value = (const char *)NULL;
+               if (unset) {
+                       *(const char **)opt->value = NULL;
                        return 0;
                }
                if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-')) {
@@ -70,13 +99,10 @@ static int get_value(struct optparse_t *p,
                return 0;
 
        case OPTION_CALLBACK:
-               if (flags & OPT_UNSET)
+               if (unset)
                        return (*opt->callback)(opt, NULL, 1);
-               if (opt->flags & PARSE_OPT_NOARG) {
-                       if (p->opt && !(flags & OPT_SHORT))
-                               return opterror(opt, "takes no value", flags);
+               if (opt->flags & PARSE_OPT_NOARG)
                        return (*opt->callback)(opt, NULL, 0);
-               }
                if (opt->flags & PARSE_OPT_OPTARG && (!arg || *arg == '-'))
                        return (*opt->callback)(opt, NULL, 0);
                if (!arg)
@@ -84,7 +110,7 @@ static int get_value(struct optparse_t *p,
                return (*opt->callback)(opt, get_arg(p), 0);
 
        case OPTION_INTEGER:
-               if (flags & OPT_UNSET) {
+               if (unset) {
                        *(int *)opt->value = 0;
                        return 0;
                }
@@ -292,7 +318,7 @@ void usage_with_options(const char * const *usagestr,
                                        pos += fprintf(stderr, " ...");
                        }
                        break;
-               default:
+               default: /* OPTION_{BIT,BOOLEAN,SET_INT,SET_PTR} */
                        break;
                }
 
@@ -311,6 +337,7 @@ void usage_with_options(const char * const *usagestr,
 
 /*----- some often used options -----*/
 #include "cache.h"
+
 int parse_opt_abbrev_cb(const struct option *opt, const char *arg, int unset)
 {
        int v;

diff --git a/parse-options.h b/parse-options.h
index 65bce6eafd19bfedd7d3b0b31ad81625842a7c0b..a8760ac4b288a44d6404d0550b9640b49789d39d 100644 (file)
--- a/parse-options.h
+++ b/parse-options.h
@@ -2,9 +2,15 @@
 #define PARSE_OPTIONS_H
 
 enum parse_opt_type {
+       /* special types */
        OPTION_END,
        OPTION_GROUP,
-       OPTION_BOOLEAN,
+       /* options with no arguments */
+       OPTION_BIT,
+       OPTION_BOOLEAN, /* _INCR would have been a better name */
+       OPTION_SET_INT,
+       OPTION_SET_PTR,
+       /* options with arguments (usually) */
        OPTION_STRING,
        OPTION_INTEGER,
        OPTION_CALLBACK,
@@ -17,6 +23,7 @@ enum parse_opt_flags {
 enum parse_opt_option_flags {
        PARSE_OPT_OPTARG  = 1,
        PARSE_OPT_NOARG   = 2,
+       PARSE_OPT_NONEG   = 4,
 };
 
 struct option;
@@ -49,12 +56,15 @@ typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
  *   mask of parse_opt_option_flags.
  *   PARSE_OPT_OPTARG: says that the argument is optionnal (not for BOOLEANs)
  *   PARSE_OPT_NOARG: says that this option takes no argument, for CALLBACKs
+ *   PARSE_OPT_NONEG: says that this option cannot be negated
  *
  * `callback`::
  *   pointer to the callback to use for OPTION_CALLBACK.
  *
  * `defval`::
  *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
+ *   OPTION_{BIT,SET_INT,SET_PTR} store the {mask,integer,pointer} to put in
+ *   the value when met.
  *   CALLBACKS can use it like they want.
  */
 struct option {
@@ -72,7 +82,10 @@ struct option {
 
 #define OPT_END()                   { OPTION_END }
 #define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
+#define OPT_BIT(s, l, v, h, b)      { OPTION_BIT, (s), (l), (v), NULL, (h), 0, NULL, (b) }
 #define OPT_BOOLEAN(s, l, v, h)     { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
+#define OPT_SET_INT(s, l, v, h, i)  { OPTION_SET_INT, (s), (l), (v), NULL, (h), 0, NULL, (i) }
+#define OPT_SET_PTR(s, l, v, h, p)  { OPTION_SET_PTR, (s), (l), (v), NULL, (h), 0, NULL, (p) }
 #define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v), NULL, (h) }
 #define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v), (a), (h) }
 #define OPT_CALLBACK(s, l, v, a, h, f) \