(interpreter-mode-alist): Add mawk.

(set-auto-mode): Allow either space or tab in #! line.

1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 4ceab9c5d1d..31c7f257ce7 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1018,6 +1018,7 @@ REGEXP and search the list again for another match.")
     ("tcl" . tcl-mode)
     ("tclsh" . tcl-mode)
     ("awk" . awk-mode)
+    ("mawk" . awk-mode)
     ("nawk" . awk-mode)
     ("gawk" . awk-mode)
     ("scm" . scheme-mode)
@@ -1172,7 +1173,7 @@ If `enable-local-variables' is nil, this function does not check for a
                 (let ((interpreter
                        (save-excursion
                          (goto-char (point-min))
-                         (if (looking-at "#! *\\([^ \t\n]*/bin/env +\\)?\\([^ \t\n]+\\)")
+                         (if (looking-at "#![ \t]?\\([^ \t\n]*/bin/env[ \t]\\)?\\([^ \t\n]+\\)")
                              (buffer-substring (match-beginning 2)
                                                (match-end 2))
                            "")))