X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=parse-options.h;h=65bce6eafd19bfedd7d3b0b31ad81625842a7c0b;hb=4e0da76318c44436286eeeca2b711d82c1098493;hp=76d73b299f8fdfb2dcdcf881f4e813cc14ad4db5;hpb=4a59fd131229968b08af9bdf221c341f54c52983;p=git.git

diff --git a/parse-options.h b/parse-options.h
index 76d73b299..65bce6eaf 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -3,26 +3,80 @@
 
 enum parse_opt_type {
 	OPTION_END,
+	OPTION_GROUP,
 	OPTION_BOOLEAN,
 	OPTION_STRING,
 	OPTION_INTEGER,
+	OPTION_CALLBACK,
 };
 
 enum parse_opt_flags {
 	PARSE_OPT_KEEP_DASHDASH = 1,
 };
 
+enum parse_opt_option_flags {
+	PARSE_OPT_OPTARG  = 1,
+	PARSE_OPT_NOARG   = 2,
+};
+
+struct option;
+typedef int parse_opt_cb(const struct option *, const char *arg, int unset);
+
+/*
+ * `type`::
+ *   holds the type of the option, you must have an OPTION_END last in your
+ *   array.
+ *
+ * `short_name`::
+ *   the character to use as a short option name, '\0' if none.
+ *
+ * `long_name`::
+ *   the long option name, without the leading dashes, NULL if none.
+ *
+ * `value`::
+ *   stores pointers to the values to be filled.
+ *
+ * `argh`::
+ *   token to explain the kind of argument this option wants. Keep it
+ *   homogenous across the repository.
+ *
+ * `help`::
+ *   the short help associated to what the option does.
+ *   Must never be NULL (except for OPTION_END).
+ *   OPTION_GROUP uses this pointer to store the group header.
+ *
+ * `flags`::
+ *   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
+ *
+ * `callback`::
+ *   pointer to the callback to use for OPTION_CALLBACK.
+ *
+ * `defval`::
+ *   default value to fill (*->value) with for PARSE_OPT_OPTARG.
+ *   CALLBACKS can use it like they want.
+ */
 struct option {
 	enum parse_opt_type type;
 	int short_name;
 	const char *long_name;
 	void *value;
+	const char *argh;
+	const char *help;
+
+	int flags;
+	parse_opt_cb *callback;
+	intptr_t defval;
 };
 
 #define OPT_END()                   { OPTION_END }
-#define OPT_BOOLEAN(s, l, v, h)     { OPTION_BOOLEAN, (s), (l), (v) }
-#define OPT_INTEGER(s, l, v, h)     { OPTION_INTEGER, (s), (l), (v) }
-#define OPT_STRING(s, l, v, a, h)   { OPTION_STRING,  (s), (l), (v) }
+#define OPT_GROUP(h)                { OPTION_GROUP, 0, NULL, NULL, NULL, (h) }
+#define OPT_BOOLEAN(s, l, v, h)     { OPTION_BOOLEAN, (s), (l), (v), NULL, (h) }
+#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) \
+	{ OPTION_CALLBACK, (s), (l), (v), (a), (h), 0, (f) }
 
 /* parse_options() will filter out the processed options and leave the
  * non-option argments in argv[].
@@ -30,6 +84,20 @@ struct option {
  */
 extern int parse_options(int argc, const char **argv,
                          const struct option *options,
-                         const char *usagestr, int flags);
+                         const char * const usagestr[], int flags);
+
+extern NORETURN void usage_with_options(const char * const *usagestr,
+                                        const struct option *options);
+
+/*----- some often used options -----*/
+extern int parse_opt_abbrev_cb(const struct option *, const char *, int);
+
+#define OPT__VERBOSE(var)  OPT_BOOLEAN('v', "verbose", (var), "be verbose")
+#define OPT__QUIET(var)    OPT_BOOLEAN('q', "quiet",   (var), "be quiet")
+#define OPT__DRY_RUN(var)  OPT_BOOLEAN('n', "dry-run", (var), "dry run")
+#define OPT__ABBREV(var)  \
+	{ OPTION_CALLBACK, 0, "abbrev", (var), "n", \
+	  "use <n> digits to display SHA-1s", \
+	  PARSE_OPT_OPTARG, &parse_opt_abbrev_cb, 0 }
 
 #endif