help: add prompt-yes setting for autocorrect

The help.autocorrect functionality is really useful, saving frustration
when a dev fat-fingers a command, and git has a pretty good idea what
was originally intended. The config settings are a nice selection, with
"prompt" asking the user to confirm that they want to run the assumed
command.

However, with "prompt", the choice defaults to "No" - that is, hitting
return will _not_ run the command. For me at least, if git is confident
it knows which command I wanted, it's usually right, and the golden path
would be to run the command.

Therefore this patch adds "prompt-yes" as a counterpart config setting
for help.autocorrect, which does the same as "prompt", but defaults to
"Yes" - hitting return will run the assumed command.

I have not added any tests because the test suite doesn't have any tests
(that I could find) for the "prompt" behaviour - I'm assuming this is
because it's hard/impossible to simulate the interactive terminal prompt

Signed-off-by: Chris Howlett <[email protected]>

Documentation/config/help.adoc

@@ -18,7 +18,9 @@ immediately.
 deciseconds (0.1 sec).
 	 - "never": don't run or show any suggested command.
 	 - "prompt": show the suggestion and prompt for confirmation to run
-the command.
+the command. The default choice at the prompt is "No"
+	 - "prompt-yes": show the suggestion and prompt for confirmation to run
+the command. The default choice at the prompt is "Yes"
 
 help.htmlPath::
 	Specify the path where the HTML documentation resides. File system paths

help.c

@@ -552,6 +552,7 @@ struct help_unknown_cmd_config {
 	struct cmdnames aliases;
 };
 
+#define AUTOCORRECT_PROMPT_YES (-5)
 #define AUTOCORRECT_SHOW (-4)
 #define AUTOCORRECT_PROMPT (-3)
 #define AUTOCORRECT_NEVER (-2)
@@ -570,6 +571,8 @@ static int parse_autocorrect(const char *value)
 
 	if (!strcmp(value, "prompt"))
 		return AUTOCORRECT_PROMPT;
+	if (!strcmp(value, "prompt-yes"))
+		return AUTOCORRECT_PROMPT_YES;
 	if (!strcmp(value, "never"))
 		return AUTOCORRECT_NEVER;
 	if (!strcmp(value, "immediate"))
@@ -650,6 +653,9 @@ char *help_unknown_cmd(const char *cmd)
 	if ((cfg.autocorrect == AUTOCORRECT_PROMPT) && (!isatty(0) || !isatty(2)))
 		cfg.autocorrect = AUTOCORRECT_NEVER;
 
+	if ((cfg.autocorrect == AUTOCORRECT_PROMPT_YES) && (!isatty(0) || !isatty(2)))
+		cfg.autocorrect = AUTOCORRECT_IMMEDIATELY;
+
 	if (cfg.autocorrect == AUTOCORRECT_NEVER) {
 		fprintf_ln(stderr, _("git: '%s' is not a git command. See 'git --help'."), cmd);
 		exit(1);
@@ -738,6 +744,15 @@ char *help_unknown_cmd(const char *cmd)
 			if (!(starts_with(answer, "y") ||
 			      starts_with(answer, "Y")))
 				exit(1);
+		} else if (cfg.autocorrect == AUTOCORRECT_PROMPT_YES) {
+			char *answer;
+			struct strbuf msg = STRBUF_INIT;
+			strbuf_addf(&msg, _("Run '%s' instead [Y/n]? "), assumed);
+			answer = git_prompt(msg.buf, PROMPT_ECHO);
+			strbuf_release(&msg);
+			if (starts_with(answer, "n") ||
+			      starts_with(answer, "N"))
+				exit(1);
 		} else {
 			fprintf_ln(stderr,
 				   _("Continuing in %0.1f seconds, "