make regen: ~8x faster: use sed script instead of single invocations

Change-Id: Ib9b3f4fc524bf3ae7cc921b0340adec113529d4d

move-asn1-header-files.sh

@@ -1,6 +1,9 @@
 #!/bin/sh
 # Usage:
-#    ../../move-asn1-headers.sh  osmocom/foo/bar  File1.h File2.h ...
+#    ../../move-asn1-headers.sh  subdir_name  File1.h File2.h ...
+# All .h and .c files in the current directory are edited to use #include <...>
+# style for the .h files given on the cmdline. The given .h files are also
+# moved to ../include/<subdir_name>/ so that #include <...> will work.
 
 set -e
 
@@ -13,13 +16,12 @@ include_dir="$base_dir/include/$include_subdir"
 mkdir -p "$include_dir"
 echo "$PWD/*.h --> $include_dir"
 
-sed_includes() {
+collect_sed_commands() {
 	while [ -n "$1" ]; do
 		fname="$1"
 		shift
 
-		echo 'sed -i "s,^#include \"'$fname'\"$,#include <'$include_subdir/$fname'>," *.[hc]'
-		sed -i "s,^#include \"$fname\"$,#include <$include_subdir/$fname>," *.[hc]
+		echo "s,^#include \"$fname\"$,#include <$include_subdir/$fname>,"
 	done
 }
 
@@ -28,8 +30,15 @@ move_headers() {
 	mv $@ "$include_dir/"
 }
 
-# first replace all `#include "foo.h"' with `#include <dir/foo.h>' locally
-sed_includes $@
-
-# move sed'ed *.h files to the proper include/dir
+# Replace all `#include "foo.h"' with `#include <dir/foo.h>' locally
+# - Collect sed commands to replace all header includes, for efficiency
+cmds="$(mktemp)"
+echo "collecting sed commands..."
+collect_sed_commands $@ > "$cmds"
+# - Run commands on all h and c files
+echo "sed -i -f \"$cmds\" *.[hc]"
+sed -i -f "$cmds" *.[hc]
+rm "$cmds"
+
+# Now move sed'ed *.h files to the proper ../include/dir
 move_headers $@