add comment to sed scripts, fix sed-enum

1 files changed, 16 insertions, 1 deletions

diff --git a/tools/sed-enums b/tools/sed-enums
index ffc193b..14738ac 100644
--- a/tools/sed-enums
+++ b/tools/sed-enums
@@ -1,17 +1,32 @@
-s/^\s*(typedef)?\s+(enum(\s+\w+)?).*$/typedef \2 { /
+# drop if don't start with (typedef)? enum
+/^\s*(typedef\s)?\s*enum/ ! b
+#
+s/^\s*(typedef\s)?\s*(enum(\s+\w+)?).*$/typedef \2 { /
+# drop if substitution fail, copy pattern to  hold space
 T;h
 :attrs;n
+# read again if {
+/^\s*\{/ b attrs
+# append each item
 s/^\s*([A-Z0-9_]+)(\s*=\s*-?[0-9]+)?.*$/\1\2, /
+# goto next if subsitution fails, append pattern, loop
 T next;H;b attrs
 :next
+# try again if } not found
 /^\s*\}/ ! b attrs
+# read enumeration name
 s/^\s*}\s*(\w+).*$/ } \1;/
 t finish
 :close
+# read the enum typedef
 s/^\s*typedef\s+enum\s+\w+\s+(\w+)\s*;/ } \1/
+# leave if substitution works, or read next line and retry
 t finish;n;b close
 :finish
+# append pattern, exchange hold space and pattern space
 H;x
+# remove \n
 s/\n//g
+# replace multi spaces with one
 s/ {2,}/ /g
 s/, }/ }/p