Add new function 'grep-file-at-point'

* lisp/progmodes/grep.el (grep-file-at-point): New function to
return the file name at point (bug#8252).

2 files changed, 12 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 4bfb5b4d165..88d8fbe4b89 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1153,6 +1153,11 @@ any directory names on the 'find' command lines end in a slash.
 This change is for better compatibility with old versions of non-GNU
 'find', such as the one used on macOS.
 
+---
+*** New utility function 'grep-file-at-point'.
+This returns the name of the file at point (if any) in 'grep-mode'
+buffers.
+
 ** Help
 
 +++
diff --git a/lisp/progmodes/grep.el b/lisp/progmodes/grep.el
index 462ea51e2ce..370bdd55163 100644
--- a/lisp/progmodes/grep.el
+++ b/lisp/progmodes/grep.el
@@ -1345,6 +1345,13 @@ command before it's run."
         (grep-highlight-matches 'always))
     (rgrep regexp files dir confirm)))
 
+(defun grep-file-at-point (point)
+  "Return the name of the file at POINT a `grep-mode' buffer.
+The returned file name is relative."
+  (when-let ((msg (get-text-property (point) 'compilation-message))
+             (loc (compilation--message->loc msg)))
+    (caar (compilation--loc->file-struct loc))))
+
 ;;;###autoload
 (defalias 'rzgrep 'zrgrep)