Re: dired-do-find-regexp failure with latin-1 encoding

[Juri Linkov <juri@linkov.net>]

>> For grep output a bigger problem is that grep on binary data
>> might output too long lines before the terminating newline.
>
> (*) We already have this kind of problem with "normal" files which contain
> minified assets (JS or CSS). The file contents are usually normal ASCII,
> but it's just one line which can reach several MBs in length.
>
> The usual way to deal with that is with project-ignores and
> grep-find-ignored-files. That works for both cases.

This is a bug problem - often grep output lines are so long
that Emacs freezes, so need to kill the process.  Updating
manually ignored-files every time a new file causes freeze
is very unreliable and time-consuming workaround.

I tried to fix this problem, and fortunately the fix is simple
with the 1-liner patch.

It does exactly the same thing that we recently did to hide
overly long grep command lines with 'grep-find-abbreviate'.
The patch even uses the same 'grep-find-abbreviate-properties'
to allow clicking the hidden part to expand it.

diff --git a/lisp/progmodes/grep.el b/lisp/progmodes/grep.el
index dafba22f77..e0df2402ee 100644
--- a/lisp/progmodes/grep.el
+++ b/lisp/progmodes/grep.el
@@ -492,6 +492,9 @@ grep-mode-font-lock-keywords
       (0 grep-context-face)
       (1 (if (eq (char-after (match-beginning 1)) ?\0)
              `(face nil display ,(match-string 2)))))
+     ;; Hide excessive parts of grep output lines
+     ("^.+?:.\\{,64\\}\\(.*\\).\\{10\\}$"
+      1 grep-find-abbreviate-properties)
      ;; Hide excessive part of rgrep command
      ("^find \\(\\. -type d .*\\\\)\\)"
       (1 (if grep-find-abbreviate grep-find-abbreviate-properties

More customizability could be added later to define the
length of the hidden part, etc.