1 files changed, 59 insertions, 0 deletions
diff --git a/doc/groupify.sed b/doc/groupify.sed
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+#! /bin/sed -nf
+# Script to add @group...@end group tags to sed.texi.in
+# so that comments are not separated from the instructions
+# that they refer to.
+
+# Step 1: search for the conventional "@c start----" comment
+1a\
+@c Do not edit this file!! It is automatically generated from sed-in.texi.
+p
+/^@c start-*$/! b
+
+# Step 2: loop until we find a @ command
+:a
+n
+p
+/^@/! ba
+
+# Step 3: process everything until a "@end" command
+
+# Step 3.1: Print the blank lines before the group.  If we reach the "@end",
+#           we go back to step 1.
+:b
+n
+/^@end/ {
+  p
+  b
+}
+/^[ 	]*$/ {
+  p
+  bb
+}
+
+# Step 3.2: Add to hold space every line until an empty one or "@end"
+h
+:c
+n
+/^@end example/! {
+  /^[ 	]*$/! {
+    H
+    bc
+  }
+}
+
+# Step 3.3: Working in hold space, add @group...@end group if there are
+#           at least two lines.  Then print the lines we processed and
+#	    switch back to pattern space.
+x
+/\n/ {
+  s/.*/@group\
+&\
+@end group/
+}
+p
+
+# Step 3.4: Switch back to pattern space, print the first blank line
+#           and possibly go back to step 3.1
+x
+p
+/^@end/ !bb