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01/06: colors: Add 'highlight'.

From: guix-commits
Subject: 01/06: colors: Add 'highlight'.
Date: Sun, 14 Apr 2019 17:41:00 -0400 (EDT)

civodul pushed a commit to branch master
in repository guix.

commit c1c5d68a94e219d0e56d5dc0e0d6ed9b08076a30
Author: Ludovic Court├Ęs <address@hidden>
Date:   Sun Apr 14 19:48:19 2019 +0200

    colors: Add 'highlight'.
    * guix/colors.scm (%highlight-color): New variable.
    (highlight): New procedure.
    * guix/ui.scm (%highlight-argument)[highlight]: Remove.
    (%highlight-color): Remove.
 guix/colors.scm | 10 ++++++++++
 guix/ui.scm     | 11 ++---------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/guix/colors.scm b/guix/colors.scm
index 30ad231..7949cf5 100644
--- a/guix/colors.scm
+++ b/guix/colors.scm
@@ -30,6 +30,7 @@
+            highlight
@@ -132,6 +133,15 @@ that subsequent output will not have any colors in effect."
        (not (getenv "NO_COLOR"))
        (isatty?* port)))
+(define %highlight-color (color BOLD))
+(define* (highlight str #:optional (port (current-output-port)))
+  "Return STR with extra ANSI color attributes to highlight it if PORT
+supports it."
+  (if (color-output? port)
+      (colorize-string str %highlight-color)
+      str))
 (define (colorize-matches rules)
   "Return a procedure that, when passed a string, returns that string
 colorized according to RULES.  RULES must be a list of tuples like:
diff --git a/guix/ui.scm b/guix/ui.scm
index 2481a1b..39b13fd 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -155,16 +155,10 @@ is a trivial format string."
 (define* (%highlight-argument arg #:optional (port (guix-warning-port)))
   "Highlight ARG, a format string argument, if PORT supports colors."
-  (define highlight
-    (if (color-output? port)
-        (lambda (str)
-          (colorize-string str %highlight-color))
-        identity))
   (cond ((string? arg)
-         (highlight arg))
+         (highlight arg port))
         ((symbol? arg)
-         (highlight (symbol->string arg)))
+         (highlight (symbol->string arg) port))
         (else arg)))
 (define-syntax define-diagnostic
@@ -220,7 +214,6 @@ messages."
 (define %info-color (color BOLD))
 (define %error-color (color BOLD RED))
 (define %hint-color (color BOLD CYAN))
-(define %highlight-color (color BOLD))
 (define* (print-diagnostic-prefix prefix #:optional location
                                   #:key (colors (color)))

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