patch 8.0.0504: looking up an Ex command is a bit slow
Problem: Looking up an Ex command is a bit slow.
Solution: Instead of just using the first letter, also use the second letter
to skip ahead in the list of commands. Generate the table with a
Perl script. (Dominique Pelle, closes #1589)
diff --git a/src/Makefile b/src/Makefile
index 1309a63..e8314ea 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1884,6 +1884,16 @@
-rm -rf autom4te.cache
-rm -f auto/config.status auto/config.cache
+# Run Perl to generate the Ex command lookup table. This only needs to be run
+# when a command name has been added or changed.
+# NOTE: Only works when perl and vim executables are available
+cmdidxs: ex_cmds.h
+ if test X`perl -e "print 123"` = "X123"; then \
+ vim ex_docmd.c -c '/Beginning.*create_cmdidxs/,/End.*create_cmdidxs/! perl create_cmdidxs.pl' -c wq; \
+ else \
+ echo Cannot run Perl; \
+ fi
+
# Re-execute this Makefile to include the new auto/config.mk produced by
# configure Only used when typing "make" with a fresh auto/config.mk.
myself: