01/01: guix: Add coloring soft port.

[Ricardo Wurmus]

rekado pushed a commit to branch wip-sahithi
in repository guix.

commit 5b556e2bb44c18a96d6ebc2d878ce0589b1b7dbd
Author: Sahithi Yarlagadda <address@hidden>
Date:   Sat Jun 16 13:21:42 2018 +0530

    guix: Add coloring soft port.
    
    * guix/ui.scm (handle-string): New procedures.
    (colorful-build-output-port): New variable.
    
    guix: Added colorful-build-output-port to build.scm instead of default
---
 guix/scripts/build.scm |  4 +---
 guix/ui.scm            | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/guix/scripts/build.scm b/guix/scripts/build.scm
index 4dd4fbc..81ad255 100644
--- a/guix/scripts/build.scm
+++ b/guix/scripts/build.scm
@@ -733,9 +733,7 @@ needed."
         ;; Set the build options before we do anything else.
         (set-build-options-from-command-line store opts)
 
-        (parameterize ((current-build-output-port (if quiet?
-                                                      (%make-void-port "w")
-                                                      (current-error-port))))
+         (parameterize ((current-build-output-port  
colorful-build-output-port))
           (let* ((mode  (assoc-ref opts 'build-mode))
                  (drv   (options->derivations store opts))
                  (urls  (map (cut string-append <> "/log")
diff --git a/guix/ui.scm b/guix/ui.scm
index 80f1a4d..88e5fa6 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -109,7 +109,7 @@
             warning
             info
             guix-main
-            colorize-string))
+            colorful-build-output-port))
 
 ;;; Commentary:
 ;;;
@@ -1631,4 +1631,51 @@ be reset such that subsequent output will not have any 
colors in effect."
    str
    (color 'RESET)))
 
+(define (handle-string str)
+ "Accepts input string(str) as argument and checks whether it matches with one 
+of the regular expressions specified. Upon matching, each substring is 
colorized 
+with corresponding colors and the modified colored string is returned. If the 
+input string fails match with the following conditionals it returns back the 
+unmodified input string."
+    (let ((message  (or (and=> (string-match "^(starting phase)(.*)" str)
+           (lambda (m)
+             (string-append
+               (colorize-string (match:substring m 1) 'BLUE)
+               (colorize-string (match:substring m 2) 'GREEN))))
+
+       (and=> (string-match "^(phase)(.*)(succeeded after)(.*)(seconds)" str)
+          (lambda (m)
+            (string-append
+              (colorize-string (match:substring m 1) 'BLUE)
+              (colorize-string (match:substring m 2) 'GREEN)
+              (colorize-string (match:substring m 3) 'BLUE)
+              (colorize-string (match:substring m 4) 'GREEN)
+              (colorize-string (match:substring m 5) 'BLUE))))
+
+       (and=> (string-match "^(phase)(.*)(failed after)(.*)(seconds)" str)
+          (lambda (m)
+            (string-append
+              (colorize-string (match:substring m 1) 'RED)
+              (colorize-string (match:substring m 2) 'GREEN)
+              (colorize-string (match:substring m 3) 'RED)
+              (colorize-string (match:substring m 4) 'GREEN)
+              (colorize-string (match:substring m 5) 'RED))))
+
+     ;; Didn’t match with any expression, returns back unmodified string.
+       str)))
+    (display message (current-error-port))))
+
+(define colorful-build-output-port
+  (make-soft-port
+   (vector
+     ;; procedure accepting one character for output
+    (lambda (c) (write c (current-error-port)))
+     ;; procedure accepting a string for handle-string procedure
+    handle-string
+    (lambda () (force-output (current-error-port)))
+    (const #t)
+    (lambda () (display "@" (current-error-port))))
+   "rw"))
+
+
 ;;; ui.scm ends here