bootstrap: marking gnulib-copied/generated files as such

[Jim Meyering]

I've just made this change.
It doesn't handle bourne shell scripts or ABOUT-NLS,
but it's enough for now.

2006-09-08  Jim Meyering  <address@hidden>

        * bootstrap (cp_mark_as_generated): New function.
        (slurp): Use it to prepend editor hints and a warning that
        the file we're copying is generated.
        Suggestion from Bruce Korb.

Index: bootstrap
===================================================================
RCS file: /fetish/cu/bootstrap,v
retrieving revision 1.8
diff -u -r1.8 bootstrap
--- bootstrap   7 Sep 2006 21:00:58 -0000       1.8
+++ bootstrap   8 Sep 2006 06:48:43 -0000
@@ -212,6 +212,29 @@
   fi;;
 esac
 
+cp_mark_as_generated()
+{
+  local src=$1
+  local dst=$2
+  local c1 c2
+  case $dst in
+    *.[chly])           c1='/* '; c2=' */';;
+    *.texi)             c1='@c '; c2=     ;;
+    *.m4|*/Make*|Make*) c1='# ';  c2=     ;;
+    *)                                    ;;
+  esac
+
+  if test -z "$c1"; then
+    cp "$src" "$dst"
+    return
+  fi
+
+  (
+    echo "$c1-*- buffer-read-only: t -*- vi: set ro:$c2"
+    echo "$c1DO NOT EDIT! GENERATED AUTOMATICALLY!$c2"
+    cat "$src"
+  ) >> "$dst"
+}
 
 slurp() {
   for dir in . `(cd $1 && find * -type d -print)`; do
@@ -225,6 +248,7 @@
       if test $file = Makefile.am; then
        copied=$copied${sep}gnulib.mk; sep=$nl
        echo "$0: Copying $1/$dir/$file to $dir/gnulib.mk ..." &&
+       rm -f $dir/gnulib.mk
        sed '/^[^#].*\/intl/s/^/#/' $1/$dir/$file >$dir/gnulib.mk
       elif test -r ${2-no/such/dir}/$dir/$file ||
           grep -F "/$file/" $dir/CVS/Entries 2>/dev/null |
@@ -234,6 +258,7 @@
        copied=$copied$sep$file; sep=$nl
        if test $file = gettext.m4; then
          echo "$0: patching m4/gettext.m4 to remove need for intl/* ..."
+         rm -f $dir/$file
          sed '
            /^AC_DEFUN(\[AM_INTL_SUBDIR],/,/^]/c\
              AC_DEFUN([AM_INTL_SUBDIR], [
@@ -243,7 +268,8 @@
              AC_DEFUN([gl_LOCK_EARLY], [])
          ' $1/$dir/$file >$dir/$file
        else
-         cp $1/$dir/$file $dir/$file
+         rm -f $dir/$file
+         cp_mark_as_generated $1/$dir/$file $dir/$file
        fi
       fi || exit
     done
@@ -319,6 +345,7 @@
 
 # Create gettext configuration.
 echo "$0: Creating po/Makevars from po/Makevars.template ..."
+rm -f po/Makevars
 sed '
   /^EXTRA_LOCALE_CATEGORIES *=/s/=.*/= '"$EXTRA_LOCALE_CATEGORIES"'/
   /^MSGID_BUGS_ADDRESS *=/s/=.*/= bug-'"$package"'@gnu.org/
@@ -331,6 +358,7 @@
 
 if test -d runtime-po; then
   # Likewise for runtime-po/Makevars, except also change a few other 
parameters.
+  rm -f runtime-po/Makevars
   sed '
     s/^\(DOMAIN\) *=.*/\1 = '"$package"'-runtime/
     s/^\(subdir\) *=.*/\1 = runtime-po/