Re: make_ctags: use -I option to ignore pg_node_attr macro

> Does is make sense to change make_etags as the attached patch does?
> This allows make_etags to use etags if Exuberant-type ctags is not
> available. This allows users to use make_etags if hey has either
> Exuberant-type ctags or etags.

The patch drops support for "-n" option :-<

Attached is the patch by fixing make_ctags (make_etags is not
touched).

If Exuberant-type ctags is available, use it (not changed).
  If Exuberant-type ctags is not available, try old ctags (not changed).
    If the old ctags does not support "-e" option, try etags (new).
      If etags is not available, give up (new).

Best reagards,
--
Tatsuo Ishii
SRA OSS LLC
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp
diff --git a/src/tools/make_ctags b/src/tools/make_ctags
index 102881667b..8fb9991db0 100755
--- a/src/tools/make_ctags
+++ b/src/tools/make_ctags
@@ -12,12 +12,15 @@ fi
 MODE=
 NO_SYMLINK=
 TAGS_FILE="tags"
+ETAGS_EXISTS=
+PROG=ctags
 
 while [ $# -gt 0 ]
 do
     if [ $1 = "-e" ]
     then    MODE="-e"
         TAGS_FILE="TAGS"
+        command -v etags >/dev/null && ETAGS_EXISTS="Y"
     elif [ $1 = "-n" ]
     then    NO_SYMLINK="Y"
     else
@@ -27,8 +30,10 @@ do
     shift
 done
 
-command -v ctags >/dev/null || \
+if test -z "$MODE"
+then    (command -v ctags >/dev/null) || \
     { echo "'ctags' program not found" 1>&2; exit 1; }
+fi
 
 trap "ret=$?; rm -rf /tmp/$$; exit $ret" 0 1 2 3 15
 rm -f ./$TAGS_FILE
@@ -36,6 +41,20 @@ rm -f ./$TAGS_FILE
 IS_EXUBERANT=""
 ctags --version 2>&1 | grep Exuberant && IS_EXUBERANT="Y"
 
+if test -z "$IS_EXUBERANT"
+then
+    if test -n "$MODE"
+    then    ctags --version 2>&1 | grep -- -e >/dev/null
+        if [ $? != 0 ]
+        then
+            if [ -z $ETAGS_EXISTS ]
+            then    echo "'ctags' does not support emacs mode and etags does not exist" 1>&2; exit 1
+            else    PROG=etags
+            fi
+        fi
+    fi
+fi
+
 # List of kinds supported by Exuberant Ctags 5.8
 # generated by ctags --list-kinds
 # --c-kinds was called --c-types before 2003
@@ -65,11 +84,16 @@ then    IGNORE_IDENTIFIES="-I pg_node_attr+"
 else    IGNORE_IDENTIFIES=
 fi
 
+if [ $PROG = "ctags" ]
+then    TAGS_OPT="-a -f"
+else    TAGS_OPT="-a -o"
+fi
+
 # this is outputting the tags into the file 'tags', and appending
 find `pwd`/ \( -name tmp_install -prune -o -name tmp_check -prune \) \
     -o \( -name "*.[chly]" -o -iname "*makefile*" -o -name "*.mk" -o -name "*.in" \
     -o -name "*.sql" -o -name "*.p[lm]" \) -type f -print |
-    xargs ctags $MODE -a -f $TAGS_FILE "$FLAGS" "$IGNORE_IDENTIFIES"
+    xargs $PROG $MODE $TAGS_OPT $TAGS_FILE "$FLAGS" "$IGNORE_IDENTIFIES"
 
 # Exuberant tags has a header that we cannot sort in with the other entries
 # so we skip the sort step