commands: consult global color.ui setting when --color=auto

This makes the behavior consistent with other git commands.

commands/api.go

@@ -80,8 +80,10 @@ var cmdApi = &Command{
 		this can be avoided is by enabling ''--obey-ratelimit''.
 
 	--color[=<WHEN>]
-		Enable colored output even if stdout is not a terminal. <WHEN> can be one
-		of "always" (default for ''--color''), "never", or "auto" (default).
+		Enable colored output even if stdout is not a terminal. <WHEN> can
+		be one of "always", "never", or "auto" (default). If the global
+		setting "color.ui" is set to "false", then color output is disabled
+		when the value of ''--color'' is "auto".
 
 	--cache <TTL>
 		Cache valid responses to GET requests for <TTL> seconds.
@@ -97,7 +99,7 @@ var cmdApi = &Command{
 
 	<ENDPOINT>
 		The GitHub API endpoint to send the HTTP request to (default: "/").
-		
+
 		To learn about available endpoints, see <https://developer.github.com/v3/>.
 		To make GraphQL queries, use "graphql" as <ENDPOINT> and pass ''-F query=QUERY''.
 

commands/ci_status.go

@@ -34,8 +34,10 @@ var cmdCiStatus = &Command{
 		%t: name of the status check
 
 	--color[=<WHEN>]
-		Enable colored output even if stdout is not a terminal. <WHEN> can be one
-		of "always" (default for ''--color''), "never", or "auto" (default).
+		Enable colored output even if stdout is not a terminal. <WHEN> can
+		be one of "always", "never", or "auto" (default). If the global
+		setting "color.ui" is set to "false", then color output is disabled
+		when the value of ''--color'' is "auto".
 
 	<COMMIT>
 		A commit SHA or branch name (default: "HEAD").

commands/issue.go

@@ -110,8 +110,10 @@ With no arguments, show a list of open issues.
 		%%: a literal %
 
 	--color[=<WHEN>]
-		Enable colored output even if stdout is not a terminal. <WHEN> can be one
-		of "always" (default for ''--color''), "never", or "auto" (default).
+		Enable colored output even if stdout is not a terminal. <WHEN> can
+		be one of "always", "never", or "auto" (default). If the global
+		setting "color.ui" is set to "false", then color output is disabled
+		when the value of ''--color'' is "auto".
 
 	-m, --message <MESSAGE>
 		The text up to the first blank line in <MESSAGE> is treated as the issue
@@ -634,6 +636,9 @@ func listLabels(cmd *Command, args *Args) {
 
 func colorizeOutput(colorSet bool, when string) bool {
 	if !colorSet || when == "auto" {
+		if value, _ := git.GlobalConfig("color.ui"); value == "false" {
+			return false
+		}
 		return ui.IsTerminal(os.Stdout)
 	} else if when == "never" {
 		return false

commands/pr.go

@@ -126,8 +126,10 @@ pr show [-uc] [-f <FORMAT>] <PR-NUMBER>
 		%%: a literal %
 
 	--color[=<WHEN>]
-		Enable colored output even if stdout is not a terminal. <WHEN> can be one
-		of "always" (default for ''--color''), "never", or "auto" (default).
+		Enable colored output even if stdout is not a terminal. <WHEN> can
+		be one of "always", "never", or "auto" (default). If the global
+		setting "color.ui" is set to "false", then color output is disabled
+		when the value of ''--color'' is "auto".
 
 	-o, --sort <KEY>
 		Sort displayed pull requests by "created" (default), "updated", "popularity", or "long-running".

commands/release.go

@@ -103,7 +103,7 @@ With no arguments, shows a list of existing releases.
 	-t, --commitish <TARGET>
 		A commit SHA or branch name to attach the release to, only used if <TAG>
 		does not already exist (default: main branch).
-	
+
 	-i, --include <PATTERN>
 		Filter the files in the release to those that match the glob <PATTERN>.
 
@@ -153,8 +153,10 @@ With no arguments, shows a list of existing releases.
 		%%: a literal %
 
 	--color[=<WHEN>]
-		Enable colored output even if stdout is not a terminal. <WHEN> can be one
-		of "always" (default for ''--color''), "never", or "auto" (default).
+		Enable colored output even if stdout is not a terminal. <WHEN> can
+		be one of "always", "never", or "auto" (default). If the global
+		setting "color.ui" is set to "false", then color output is disabled
+		when the value of ''--color'' is "auto".
 
 	<TAG>
 		The git tag name for this release.

commands/sync.go

@@ -25,8 +25,10 @@ same-named branch on the remote, treat that as its upstream branch.
 
 ## Options:
 	--color[=<WHEN>]
-		Enable colored output even if stdout is not a terminal. <WHEN> can be one
-		of "always" (default for ''--color''), "never", or "auto" (default).
+		Enable colored output even if stdout is not a terminal. <WHEN> can
+		be one of "always", "never", or "auto" (default). If the global
+		setting "color.ui" is set to "false", then color output is disabled
+		when the value of ''--color'' is "auto".
 
 ## See also: