add -p: prompt for single characters

Use Term::ReadKey, if available and enabled with interactive.singlekey,
to let the user answer add -p's prompts by pressing a single key.  We're
not doing the same in the main 'add -i' interface because file selection
etc. may expect several characters.

Two commands take an argument: 'g' can easily cope since it'll just
offer a choice of chunks.  '/' now (unconditionally, even without
readkey) offers a chance to enter a regex if none was given.

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index e2b8775dd308d66027494d8705643c30581e2e65..eeb2b0d353583e9406afc23fe053f56f6244aa73 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1000,6 +1000,13 @@ instaweb.port::
        The port number to bind the gitweb httpd to. See
        linkgit:git-instaweb[1].
 
+interactive.singlekey::
+       In interactive programs, allow the user to provide one-letter
+       input with a single key (i.e., without hitting enter).
+       Currently this is used only by the `\--patch` mode of
+       linkgit:git-add[1].  Note that this setting is silently
+       ignored if portable keystroke input is not available.
+
 log.date::
        Set default date-time mode for the log command. Setting log.date
        value is similar to using 'git-log'\'s --date option. The value is one of the

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index 3bf0cda4eef6714b09df0360d48c12796598071a..1813f9e8e388397fa314717c2170861c1dc5e6a0 100755 (executable)
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -33,6 +33,14 @@ my ($diff_new_color) =
 
 my $normal_color = $repo->get_color("", "reset");
 
+my $use_readkey = 0;
+if ($repo->config_bool("interactive.singlekey")) {
+       eval {
+               use Term::ReadKey;
+               $use_readkey = 1;
+       };
+}
+
 sub colored {
        my $color = shift;
        my $string = join("", @_);
@@ -758,11 +766,32 @@ sub diff_applies {
        return close $fh;
 }
 
+sub _restore_terminal_and_die {
+       ReadMode 'restore';
+       print "\n";
+       exit 1;
+}
+
+sub prompt_single_character {
+       if ($use_readkey) {
+               local $SIG{TERM} = \&_restore_terminal_and_die;
+               local $SIG{INT} = \&_restore_terminal_and_die;
+               ReadMode 'cbreak';
+               my $key = ReadKey 0;
+               ReadMode 'restore';
+               print "$key" if defined $key;
+               print "\n";
+               return $key;
+       } else {
+               return <STDIN>;
+       }
+}
+
 sub prompt_yesno {
        my ($prompt) = @_;
        while (1) {
                print colored $prompt_color, $prompt;
-               my $line = <STDIN>;
+               my $line = prompt_single_character;
                return 0 if $line =~ /^n/i;
                return 1 if $line =~ /^y/i;
        }
@@ -893,7 +922,7 @@ sub patch_update_file {
                        print @{$mode->{DISPLAY}};
                        print colored $prompt_color,
                                "Stage mode change [y/n/a/d/?]? ";
-                       my $line = <STDIN>;
+                       my $line = prompt_single_character;
                        if ($line =~ /^y/i) {
                                $mode->{USE} = 1;
                                last;
@@ -966,7 +995,7 @@ sub patch_update_file {
                        print;
                }
                print colored $prompt_color, "Stage this hunk [y,n,a,d,/$other,?]? ";
-               my $line = <STDIN>;
+               my $line = prompt_single_character;
                if ($line) {
                        if ($line =~ /^y/i) {
                                $hunk[$ix]{USE} = 1;
@@ -1018,9 +1047,17 @@ sub patch_update_file {
                                next;
                        }
                        elsif ($line =~ m|^/(.*)|) {
+                               my $regex = $1;
+                               if ($1 eq "") {
+                                       print colored $prompt_color, "search for regex? ";
+                                       $regex = <STDIN>;
+                                       if (defined $regex) {
+                                               chomp $regex;
+                                       }
+                               }
                                my $search_string;
                                eval {
-                                       $search_string = qr{$1}m;
+                                       $search_string = qr{$regex}m;
                                };
                                if ($@) {
                                        my ($err,$exp) = ($@, $1);