Commit 6b8d0852 authored by Juri Linkov's avatar Juri Linkov

(grep-process-setup): Set envvar "TERM" to "emacs-grep".

Set envvar "GREP_OPTIONS" to "--color=auto" instead of "--color=always".
parent 50bfa18a
......@@ -371,11 +371,16 @@ Set up `compilation-exit-message-function' and run `grep-setup-hook'."
(unless (or (not grep-highlight-matches) (eq grep-highlight-matches t))
(grep-compute-defaults))
(when (eq grep-highlight-matches t)
;; Modify `process-environment' locally bound in `compilation-start'
(setenv "GREP_OPTIONS" (concat (getenv "GREP_OPTIONS") " --color=always"))
;; for GNU grep 2.5.1
;; `setenv' modifies `process-environment' let-bound in `compilation-start'
;; Any TERM except "dumb" allows GNU grep to use `--color=auto'
(setenv "TERM" "emacs-grep")
;; `--color=auto' emits escape sequences on a tty rather than on a pipe,
;; thus allowing to use multiple grep filters on the command line
;; and to output escape sequences only on the final grep output
(setenv "GREP_OPTIONS" (concat (getenv "GREP_OPTIONS") " --color=auto"))
;; GREP_COLOR is used in GNU grep 2.5.1, but deprecated in later versions
(setenv "GREP_COLOR" "01;31")
;; for GNU grep 2.5.1-cvs
;; GREP_COLORS is used in GNU grep 2.5.2 and later versions
(setenv "GREP_COLORS" "mt=01;31:fn=:ln=:bn=:se=:ml=:cx=:ne"))
(set (make-local-variable 'compilation-exit-message-function)
(lambda (status code msg)
......
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