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bug#25464: 25.1.90; info-lookup support for gdb-script mode

From: Tom Tromey
Subject: bug#25464: 25.1.90; info-lookup support for gdb-script mode
Date: Mon, 16 Jan 2017 21:32:13 -0700

This patch adds support for gdb-script mode to info-lookup-symbol.
Let me know what you think.

commit 42181a28e96b2e5e48ceb4584fa0170bcc882e91
Author: Tom Tromey <address@hidden>
Date:   Mon Jan 16 15:59:06 2017 -0700

    Add info-lookup help for gdb-script-mode
    * lisp/info-look.el (info-lookup-guess-gdb-script-symbol): New
    Add help for gdb-script-mode.

diff --git a/lisp/info-look.el b/lisp/info-look.el
index 1f3c508..2dc8c5a 100644
--- a/lisp/info-look.el
+++ b/lisp/info-look.el
@@ -648,6 +648,26 @@ info-lookup-guess-custom-symbol
            (buffer-substring-no-properties beg end)))))
     (error nil)))
+(defun info-lookup-guess-gdb-script-symbol ()
+  "Get symbol at point in GDB script buffers."
+  (condition-case nil
+      (save-excursion
+        (back-to-indentation)
+        ;; Try to find the current line's full command in the index;
+        ;; and default to the longest subset that is found.
+        (when (looking-at "[-a-z]+\\(\\s-[-a-z]+\\)*")
+          (let ((str-list (split-string (match-string-no-properties 0)
+                                        "\\s-+" t))
+                (completions (info-lookup->completions 'symbol
+                                                       'gdb-script-mode)))
+            (catch 'result
+              (while str-list
+                (let ((str (string-join str-list " ")))
+                  (when (assoc str completions)
+                    (throw 'result str))
+                  (nbutlast str-list)))))))
+    (error nil)))
 (defun info-complete-symbol (&optional mode)
   "Perform completion on symbol preceding point."
@@ -1051,6 +1071,14 @@ info-complete
  :mode 'help-mode
  :regexp "[^][()`'‘’,:\" \t\n]+"
  :other-modes '(emacs-lisp-mode))
+ :mode 'gdb-script-mode
+ :ignore-case nil
+ :regexp "\\([-a-z]+\\(\\s-+[-a-z]+\\)*\\)"
+ :doc-spec '(("(gdb)Command and Variable Index" nil
+              nil nil))
+ :parse-rule 'info-lookup-guess-gdb-script-symbol)

 (provide 'info-look)

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.20.9)
 of 2016-12-20 built on bapiya
Repository revision: 88cdf14b37a7344bb266e94512485e3cc738c23d
Windowing system distributor 'Fedora Project', version 11.0.11900000
System Description:     Fedora release 25 (Twenty Five)

Configured using:
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Configured features:

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