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issue with gdb-mi.el and Guile

From: David Boles
Subject: issue with gdb-mi.el and Guile
Date: Thu, 1 Jun 2017 20:37:46 -0500

When using the guile command at the gdb prompt within emacs, it is easy to end 
up in a state in which the behavior of repeating the previous gdb command when 
hitting return is disabled. Basically, the gdb-send function in gdb-mi.el 
thinks that if you’ve entered “guile” at the gdb command prompt, then you must 
be in guile mode until it sees you enter a “,q”, “,quit”, or “end”.

Most of the time I use the guile control command to execute single Guile 
expressions (otherwise, I’d enter the guile repl). The patch below modifies 
this behavior in gdb-mi.el. I am decidedly not a “real Emacs Lisp” developer so 
there may well be a better/cleaner way to accomplish the same task. 
Nevertheless, this patch greatly improves the experience of using Guile within 
gdb within Emacs. The diff below is against a fresh tree a few days old.


 - db

diff --git a/lisp/progmodes/gdb-mi.el b/lisp/progmodes/gdb-mi.el
index 1af520d..438fb75 100644
--- a/lisp/progmodes/gdb-mi.el
+++ b/lisp/progmodes/gdb-mi.el
@@ -1778,6 +1778,9 @@ static char *magick[] = {
 As long as GDB is in the recursive reading loop, it does not expect
 commands to be prefixed by \"-interpreter-exec console\".")
+(defvar gdb-guile-command-non-empty-regexp 
+  "Regexp matching a non-empty GDB guile command.")
 (defun gdb-strip-string-backslash (string)
   (replace-regexp-in-string "\\\\$" "" string))
@@ -1831,7 +1834,8 @@ commands to be prefixed by \"-interpreter-exec 
               (> gdb-control-level 0))
          (setq gdb-control-level (1- gdb-control-level)))
       (setq gdb-continuation nil)))
-  (if (string-match gdb-control-commands-regexp string)
+  (if (and (string-match gdb-control-commands-regexp string)
+           (not (string-match gdb-guile-command-non-empty-regexp string)))
       (setq gdb-control-level (1+ gdb-control-level))))
 (defun gdb-mi-quote (string)

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