help: show the suggested command when help.autocorrect is false

Make the handling of false boolean values for help.autocorrect
consistent with the handling of value 0 by showing the suggested
commands but not running them.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config/help.txt

@@ -11,12 +11,12 @@ help.autoCorrect::
 	If git detects typos and can identify exactly one valid command similar
 	to the error, git will try to suggest the correct command or even
 	run the suggestion automatically. Possible config values are:
-	 - 0: show the suggested command (default).
+	 - 0, "false", "off", "no": show the suggested command (default).
 	 - 1, "true", "on", "yes", "immediate": run the suggested command
 immediately.
 	 - positive number > 1: run the suggested command after specified
 deciseconds (0.1 sec).
-	 - "false", "off", "no", "never": don't run or show any suggested command.
+	 - "never": don't run or show any suggested command.
 	 - "prompt": show the suggestion and prompt for confirmation to run
 the command.
 

help.c

@@ -552,6 +552,7 @@ struct help_unknown_cmd_config {
 	struct cmdnames aliases;
 };
 
+#define AUTOCORRECT_SHOW (-4)
 #define AUTOCORRECT_PROMPT (-3)
 #define AUTOCORRECT_NEVER (-2)
 #define AUTOCORRECT_IMMEDIATELY (-1)
@@ -562,7 +563,7 @@ static int parse_autocorrect(const char *value)
 		case 1:
 			return AUTOCORRECT_IMMEDIATELY;
 		case 0:
-			return AUTOCORRECT_NEVER;
+			return AUTOCORRECT_SHOW;
 		default: /* other random text */
 			break;
 	}
@@ -713,7 +714,8 @@ char *help_unknown_cmd(const char *cmd)
 		     n++)
 			; /* still counting */
 	}
-	if (cfg.autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) {
+	if (cfg.autocorrect && cfg.autocorrect != AUTOCORRECT_SHOW && n == 1 &&
+	    SIMILAR_ENOUGH(best_similarity)) {
 		char *assumed = xstrdup(main_cmds.names[0]->name);
 
 		fprintf_ln(stderr,

t/t9003-help-autocorrect.sh

@@ -28,15 +28,18 @@ test_expect_success 'setup' '
 	test_cmp expect actual
 '
 
-test_expect_success 'autocorrect showing candidates' '
-	git config help.autocorrect 0 &&
+for show in false no off 0
+do
+	test_expect_success 'autocorrect showing candidates' '
+		git config help.autocorrect $show &&
 
-	test_must_fail git lfg 2>actual &&
-	grep "^	lgf" actual &&
+		test_must_fail git lfg 2>actual &&
+		grep "^	lgf" actual &&
 
-	test_must_fail git distimdist 2>actual &&
-	grep "^	distimdistim" actual
-'
+		test_must_fail git distimdist 2>actual &&
+		grep "^	distimdistim" actual
+	'
+done
 
 for immediate in -1 immediate
 do