Speed up loading of term/xterm.el.

* lisp/term/xterm.el: Don't do the key substitutions unless f13-f60 are
  really defined.


git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-367

1 files changed, 54 insertions, 51 deletions

diff --git a/lisp/term/xterm.el b/lisp/term/xterm.el
index a00271f2ce3..88d1ffa98e6 100644
--- a/lisp/term/xterm.el
+++ b/lisp/term/xterm.el
@@ -201,57 +201,60 @@
 ;; definition if found in function-key-map, there are no further
 ;; lookups in other keymaps.
 (let ((m (terminal-local-value 'function-key-map nil)))
-  (substitute-key-definition [f13] [S-f1] m)
-  (substitute-key-definition [f14] [S-f2] m)
-  (substitute-key-definition [f15] [S-f3] m)
-  (substitute-key-definition [f16] [S-f4] m)
-  (substitute-key-definition [f17] [S-f5] m)
-  (substitute-key-definition [f18] [S-f6] m)
-  (substitute-key-definition [f19] [S-f7] m)
-  (substitute-key-definition [f20] [S-f8] m)
-  (substitute-key-definition [f21] [S-f9] m)
-  (substitute-key-definition [f22] [S-f10] m)
-  (substitute-key-definition [f23] [S-f11] m)
-  (substitute-key-definition [f24] [S-f12] m)
-
-  (substitute-key-definition [f25] [C-f1] m)
-  (substitute-key-definition [f26] [C-f2] m)
-  (substitute-key-definition [f27] [C-f3] m)
-  (substitute-key-definition [f28] [C-f4] m)
-  (substitute-key-definition [f29] [C-f5] m)
-  (substitute-key-definition [f30] [C-f6] m)
-  (substitute-key-definition [f31] [C-f7] m)
-  (substitute-key-definition [f32] [C-f8] m)
-  (substitute-key-definition [f33] [C-f9] m)
-  (substitute-key-definition [f34] [C-f10] m)
-  (substitute-key-definition [f35] [C-f11] m)
-  (substitute-key-definition [f36] [C-f12] m)
-
-  (substitute-key-definition [f37] [C-S-f1] m)
-  (substitute-key-definition [f38] [C-S-f2] m)
-  (substitute-key-definition [f39] [C-S-f3] m)
-  (substitute-key-definition [f40] [C-S-f4] m)
-  (substitute-key-definition [f41] [C-S-f5] m)
-  (substitute-key-definition [f42] [C-S-f6] m)
-  (substitute-key-definition [f43] [C-S-f7] m)
-  (substitute-key-definition [f44] [C-S-f8] m)
-  (substitute-key-definition [f45] [C-S-f9] m)
-  (substitute-key-definition [f46] [C-S-f10] m)
-  (substitute-key-definition [f47] [C-S-f11] m)
-  (substitute-key-definition [f48] [C-S-f12] m)
-
-  (substitute-key-definition [f49] [A-f1] m)
-  (substitute-key-definition [f50] [A-f2] m)
-  (substitute-key-definition [f51] [A-f3] m)
-  (substitute-key-definition [f52] [A-f4] m)
-  (substitute-key-definition [f53] [A-f5] m)
-  (substitute-key-definition [f54] [A-f6] m)
-  (substitute-key-definition [f55] [A-f7] m)
-  (substitute-key-definition [f56] [A-f8] m)
-  (substitute-key-definition [f57] [A-f9] m)
-  (substitute-key-definition [f58] [A-f10] m)
-  (substitute-key-definition [f59] [A-f11] m)
-  (substitute-key-definition [f60] [A-f12] m))
+  ;; This stuff takes several seconds; don't do it unless the keys
+  ;; seem to be defined.
+  (when (lookup-key m [f13])
+    (substitute-key-definition [f13] [S-f1] m)
+    (substitute-key-definition [f14] [S-f2] m)
+    (substitute-key-definition [f15] [S-f3] m)
+    (substitute-key-definition [f16] [S-f4] m)
+    (substitute-key-definition [f17] [S-f5] m)
+    (substitute-key-definition [f18] [S-f6] m)
+    (substitute-key-definition [f19] [S-f7] m)
+    (substitute-key-definition [f20] [S-f8] m)
+    (substitute-key-definition [f21] [S-f9] m)
+    (substitute-key-definition [f22] [S-f10] m)
+    (substitute-key-definition [f23] [S-f11] m)
+    (substitute-key-definition [f24] [S-f12] m)
+
+    (substitute-key-definition [f25] [C-f1] m)
+    (substitute-key-definition [f26] [C-f2] m)
+    (substitute-key-definition [f27] [C-f3] m)
+    (substitute-key-definition [f28] [C-f4] m)
+    (substitute-key-definition [f29] [C-f5] m)
+    (substitute-key-definition [f30] [C-f6] m)
+    (substitute-key-definition [f31] [C-f7] m)
+    (substitute-key-definition [f32] [C-f8] m)
+    (substitute-key-definition [f33] [C-f9] m)
+    (substitute-key-definition [f34] [C-f10] m)
+    (substitute-key-definition [f35] [C-f11] m)
+    (substitute-key-definition [f36] [C-f12] m)
+
+    (substitute-key-definition [f37] [C-S-f1] m)
+    (substitute-key-definition [f38] [C-S-f2] m)
+    (substitute-key-definition [f39] [C-S-f3] m)
+    (substitute-key-definition [f40] [C-S-f4] m)
+    (substitute-key-definition [f41] [C-S-f5] m)
+    (substitute-key-definition [f42] [C-S-f6] m)
+    (substitute-key-definition [f43] [C-S-f7] m)
+    (substitute-key-definition [f44] [C-S-f8] m)
+    (substitute-key-definition [f45] [C-S-f9] m)
+    (substitute-key-definition [f46] [C-S-f10] m)
+    (substitute-key-definition [f47] [C-S-f11] m)
+    (substitute-key-definition [f48] [C-S-f12] m)
+
+    (substitute-key-definition [f49] [A-f1] m)
+    (substitute-key-definition [f50] [A-f2] m)
+    (substitute-key-definition [f51] [A-f3] m)
+    (substitute-key-definition [f52] [A-f4] m)
+    (substitute-key-definition [f53] [A-f5] m)
+    (substitute-key-definition [f54] [A-f6] m)
+    (substitute-key-definition [f55] [A-f7] m)
+    (substitute-key-definition [f56] [A-f8] m)
+    (substitute-key-definition [f57] [A-f9] m)
+    (substitute-key-definition [f58] [A-f10] m)
+    (substitute-key-definition [f59] [A-f11] m)
+    (substitute-key-definition [f60] [A-f12] m)))
 
 
 ;; Set up colors, for those versions of xterm that support it.