[PATCH v5 1/5] cli: command line parsing: allow default for keyword options

[Mark Walters]

This changes the parsing for "keyword" options so that if the option
is specified with no argument the first possible argument is
chosen. This make it easier to add options to existing boolean
arguments (the existing --option can default to TRUE).
---
 command-line-arguments.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/command-line-arguments.c b/command-line-arguments.c
index 76b185f..d40c7e6 100644
--- a/command-line-arguments.c
+++ b/command-line-arguments.c
@@ -11,10 +11,16 @@
 */
 
 static notmuch_bool_t
-_process_keyword_arg (const notmuch_opt_desc_t *arg_desc, const char *arg_str) {
+_process_keyword_arg (const notmuch_opt_desc_t *arg_desc, char next, const char *arg_str) {
 
     const notmuch_keyword_t *keywords = arg_desc->keywords;
 
+    if (next == 0) {
+/* No keyword given so return first option as default */
+	*((int *)arg_desc->output_var) = keywords->value;
+	return TRUE;
+    }
+
     while (keywords->name) {
 	if (strcmp (arg_str, keywords->name) == 0) {
 	    if (arg_desc->output_var) {
@@ -99,7 +105,8 @@ parse_option (const char *arg,
 	     */
 	    if (next != '=' && next != ':' && next != 0) return FALSE;
 	    if (next == 0) {
-		if (try->opt_type != NOTMUCH_OPT_BOOLEAN)
+		if (try->opt_type != NOTMUCH_OPT_BOOLEAN &&
+		    try->opt_type != NOTMUCH_OPT_KEYWORD)
 		    return FALSE;
 	    } else {
 		if (value[0] == 0) return FALSE;
@@ -110,7 +117,7 @@ parse_option (const char *arg,
 
 	    switch (try->opt_type) {
 	    case NOTMUCH_OPT_KEYWORD:
-		return _process_keyword_arg (try, value);
+		return _process_keyword_arg (try, next, value);
 		break;
 	    case NOTMUCH_OPT_BOOLEAN:
 		return _process_boolean_arg (try, next, value);
-- 
1.7.9.1