From 737c0767758bbd65cf95c44ccc09bca970e2ef8e Mon Sep 17 00:00:00 2001
From: John Brooks <john@fastquake.com>
Date: Mon, 10 Jul 2017 15:52:24 -0700
Subject: [PATCH] checkpatch: change format of --color argument to
 --color[=WHEN]

The boolean --color argument did not offer the ability to force
colourized output even if stdout is not a terminal.  Change the format
of the argument to the familiar --color[=WHEN] construct as seen in
common Linux utilities such as git, ls and dmesg, which allows the user
to specify whether to colourize output "always", "never", or "auto" when
the output is a terminal.  The default is "auto".

The old command-line uses of --color and --no-color are unchanged.

Link: http://lkml.kernel.org/r/efe43bdbad400f39ba691ae663044462493b0773.1496799721.git.joe@perches.com
Signed-off-by: John Brooks <john@fastquake.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 scripts/checkpatch.pl | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index ab12e3040abb..63409dbd0de5 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -57,7 +57,7 @@ my $codespell = 0;
 my $codespellfile = "/usr/share/codespell/dictionary.txt";
 my $conststructsfile = "$D/const_structs.checkpatch";
 my $typedefsfile = "";
-my $color = 1;
+my $color = "auto";
 my $allow_c99_comments = 1;
 
 sub help {
@@ -116,7 +116,8 @@ Options:
                              (default:/usr/share/codespell/dictionary.txt)
   --codespellfile            Use this codespell dictionary
   --typedefsfile             Read additional types from this file
-  --color                    Use colors when output is STDOUT (default: on)
+  --color[=WHEN]             Use colors 'always', 'never', or only when output
+                             is a terminal ('auto'). Default is 'auto'.
   -h, --help, --version      display this help and exit
 
 When FILE is - read standard input.
@@ -182,6 +183,14 @@ if (-f $conf) {
 	unshift(@ARGV, @conf_args) if @conf_args;
 }
 
+# Perl's Getopt::Long allows options to take optional arguments after a space.
+# Prevent --color by itself from consuming other arguments
+foreach (@ARGV) {
+	if ($_ eq "--color" || $_ eq "-color") {
+		$_ = "--color=$color";
+	}
+}
+
 GetOptions(
 	'q|quiet+'	=> \$quiet,
 	'tree!'		=> \$tree,
@@ -212,7 +221,9 @@ GetOptions(
 	'codespell!'	=> \$codespell,
 	'codespellfile=s'	=> \$codespellfile,
 	'typedefsfile=s'	=> \$typedefsfile,
-	'color!'	=> \$color,
+	'color=s'	=> \$color,
+	'no-color'	=> \$color,	#keep old behaviors of -nocolor
+	'nocolor'	=> \$color,	#keep old behaviors of -nocolor
 	'h|help'	=> \$help,
 	'version'	=> \$help
 ) or help(1);
@@ -238,6 +249,18 @@ if ($#ARGV < 0) {
 	push(@ARGV, '-');
 }
 
+if ($color =~ /^[01]$/) {
+	$color = !$color;
+} elsif ($color =~ /^always$/i) {
+	$color = 1;
+} elsif ($color =~ /^never$/i) {
+	$color = 0;
+} elsif ($color =~ /^auto$/i) {
+	$color = (-t STDOUT);
+} else {
+	die "Invalid color mode: $color\n";
+}
+
 sub hash_save_array_words {
 	my ($hashRef, $arrayRef) = @_;
 
@@ -1883,7 +1906,7 @@ sub report {
 		return 0;
 	}
 	my $output = '';
-	if (-t STDOUT && $color) {
+	if ($color) {
 		if ($level eq 'ERROR') {
 			$output .= RED;
 		} elsif ($level eq 'WARNING') {
@@ -1894,10 +1917,10 @@ sub report {
 	}
 	$output .= $prefix . $level . ':';
 	if ($show_types) {
-		$output .= BLUE if (-t STDOUT && $color);
+		$output .= BLUE if ($color);
 		$output .= "$type:";
 	}
-	$output .= RESET if (-t STDOUT && $color);
+	$output .= RESET if ($color);
 	$output .= ' ' . $msg . "\n";
 
 	if ($showfile) {