Do not match file names that end in '/', as they cannot be 'grep'
hits nowadays. This prevents confusion when 'grep -r' reports a
match in a file whose basename is ':12345:'. Conversely, do not
require exactly the same sequence of spaces and tabs after both
colons, and allow spaces or tabs before the second colon, as per
the POSIX spec for 'grep' output.
The GREP_OPTIONS environment variable is planned to be marked
obsolescent in GNU grep, due to problems in its use, so stop
relying on it.
* progmodes/grep.el (grep-highlight-matches): Document this.
(grep-process-setup): Do not set GREP_OPTIONS.
(grep-compute-defaults): Use an explicit --color option if supported.
(read-regexp-suggestions): New function.
(read-regexp): Use `read-regexp-defaults-function' to get default values.
Use `read-regexp-suggestions'. Add non-empty default to history
for empty input.
(occur-read-regexp-defaults-function): Remove function.
(occur-read-primary-args): Use `regexp-history-last' instead of
`occur-read-regexp-defaults-function'.
* lisp/hi-lock.el (hi-lock-read-regexp-defaults-function): Remove function.
(hi-lock-line-face-buffer, hi-lock-face-buffer)
(hi-lock-face-phrase-buffer): Use `regexp-history-last' instead of
`hi-lock-read-regexp-defaults-function'. Doc fix.
(hi-lock-face-symbol-at-point): Replace `find-tag-default-as-regexp'
with `find-tag-default-as-symbol-regexp'. Doc fix.
(hi-lock-read-regexp-defaults): Remove function.
(hi-lock-regexp-okay): Add check for null.
* lisp/progmodes/grep.el (grep-read-regexp): Use `grep-tag-default' for
the arg DEFAULTS. Move formatting of the prompt to `read-regexp'.
* lisp/subr.el (find-tag-default-as-symbol-regexp): New function.
(find-tag-default-as-regexp): Move symbol regexp formatting to
`find-tag-default-as-symbol-regexp'.
Fixes: debbugs:14405
of `read-from-minibuffer' when `regexp-flag' is non-nil.
(occur-read-primary-args): Use `read-regexp' instead of
`read-string'.
(multi-occur-in-matching-buffers): Use `read-regexp' instead of
`read-from-minibuffer'.
* lisp/isearch.el (isearch-occur): Use `read-regexp' instead of
`read-string'.
* lisp/dired.el (dired-read-regexp): Use `read-regexp' instead of
`read-from-minibuffer'.
* lisp/progmodes/grep.el (grep-read-regexp): Use `read-regexp' instead
of `read-string'.
Fixes: debbugs:7567
* lisp/progmodes/grep.el (rgrep): Tweak the find command line so
that directories matching `grep-find-ignored-files' won't be
pruned.
Fixes: debbugs:10351
* lisp/progmodes/compile.el (compilation-next-error-function):
Respect compilation-first-column in the "*compilation*" buffer.
* lisp/progmodes/grep.el (grep-first-column): New variable.
based on text properties put by `grep-filter' instead of matching
escape sequences.
(grep-mode): Set buffer-local `compilation-error-screen-columns'
to the value of `grep-error-screen-columns'.
Fixes: debbugs:9438
* etc/grep.txt: Add `eval' to the Local Variables section that
emulates `grep-filter'.
* lisp/progmodes/grep.el (grep-filter): Avoid incomplete processing by
keeping point where processing of grep matches begins, and
continue to delete remaining escape sequences from the same point.
(grep-filter): Make leading zero optional in "0?1;31m" because
git-grep emits "\033[1;31m" escape sequences unlike expected
"\033[01;31m" as GNU Grep does.
(grep-process-setup): Replace obsolete "ml=" with newer "sl=".
Fixes: debbugs:9408
* progmodes/grep.el (grep-mode-font-lock-keywords): Remove
buffer-changing entries.
(grep-filter): New function.
(grep-mode): Add it to compilation-filter-hook.
* progmodes/compile.el (compilation-filter-hook)
(compilation-filter-start): New defvars.
(compilation-filter): Call compilation-filter-hook prior to
updating the process mark.
