Instead of drop msgctxt, treat same as gettext-tools>=0.15.

tested with editors/medit and graphics/gimp and context specified translate
messages are appeared.

mk/tools/msgfmt-msgctxt.awk

@@ -1,20 +1,106 @@
-# $NetBSD: msgfmt-msgctxt.awk,v 1.3 2012/09/10 16:07:44 adam Exp $
+# $NetBSD: msgfmt-msgctxt.awk,v 1.4 2013/05/03 12:31:43 obache Exp $
 #
-# Simple awk script to strip out .po entries with "msgctxt" or "#~|", so the
-# resultant file can be handled by the msgfmt 0.14.x.
-{
-sub(/\r$/, "")
-if (/^$/) { entry_end(); }
-else if ($1 == "msgctxt" || $2 == "msgctxt") { skip = 1; }
-else if ($1 == "#~") { skip = 1; }
-else { entry = entry $0 "\n" }
-}
+# Simple awk script to strip out .po entries with msgctxt and "#~|", so the
+# resultant file can be handled by the msgfmt<0.15.
+# Additionally, normalize EOL style by stripping \r.
 
-END { entry_end(); }
+BEGIN {
+	EMPTY = "^$"
+	SPACE = "[ 	]*"
+	KEYWORD_SEP = "([ 	]+|[ 	]*\"|$)"
+	OBSOLETE = "#~ "
+	OBSOLETE_RE = "^(#~[ 	]+)?[ 	]*"
+	OBSOLETE_RE_MATCH = "^#~[ 	]+"
+	MSG_CONTINUATION_RE = OBSOLETE_RE "\""
 
-function entry_end() {
-    if (!skip)
-	print entry;
-    entry = "";
-    skip = 0;
+	result = getline
+	if (result < 1) exit result
+
+	s = 0
+	p = 0
+	obsolete = ""
+
+	while (result == 1) {
+
+		# Buffer any "msgctxt" statements into the singular array.
+		# Strip all trailing empty strings that have no effect on
+		# the output.
+		#
+		MSGCTXT_RE = OBSOLETE_RE "msgctxt"
+		if ($0 ~ MSGCTXT_RE KEYWORD_SEP) {
+			obsolete = ""
+			if ($0 ~ OBSOLETE_RE_MATCH) obsolete = OBSOLETE
+			sub(MSGCTXT_RE SPACE, "");
+			s = 0
+			if ($0 ~ EMPTY) $0 = "\"\""
+			sub(/\r$/, "")
+			singular[s++] = $0
+			while (result = getline) {
+				if ($0 ~ OBSOLETE_RE "$") continue
+				if ($0 !~ MSG_CONTINUATION_RE) break
+				sub(OBSOLETE_RE , "")
+				sub(/\r$/, "")
+				singular[s++] = $0
+			}
+			if (result < 0) break
+			while ((s > 1) && (singular[s-1] ~ /^""$/)) s--
+			continue
+		}
+
+		# If we see "msgid", then we are outputting the
+		# context of a singular form of a message, so dump
+		# the contents of the singular array as "msgid"
+		# and output magic word "\004" then continue to output
+		# subsequent "msgid".  Strip all trailing empty strings
+		# that have no effect on the output, and handle "\n"
+		# pickiness between msgctxt and msgid.
+		#
+		MSGID_RE = OBSOLETE_RE "msgid"
+		if ($0 ~ MSGID_RE KEYWORD_SEP) {
+			if (s > 0) {
+				print obsolete "msgid " singular[0]
+				for (i = 1; i < s; i++)
+					print obsolete singular[i]
+				print obsolete "\"\\004\""
+			}
+			if ($0 ~ OBSOLETE_RE_MATCH) obsolete = OBSOLETE
+			sub(MSGID_RE SPACE, "")
+			t = 0
+			if ($0 ~ EMPTY) $0 = "\"\""
+			sub(/\r$/, "")
+			msgid[t++] = $0
+			while (result = getline) {
+				if ($0 !~ MSG_CONTINUATION_RE) break
+				sub(OBSOLETE_RE, "")
+				sub(/\r$/, "")
+				msgid[t++] = $0
+			}
+			if (result < 0) break
+			while ((t > 1) && (msgid[t-1] ~ /^""$/)) t--
+			if ((singular[s-1] ~ /\\n"$/) &&
+			    (msgid[t-1] !~ /\\n"$/)) {
+				if (msgid[t-1] !~ /""/)
+					sub("\"$", "\\n\"", msgid[t-1])
+			}
+			if (t > 0) {
+				if (s > 0) {
+					print obsolete msgid[0]
+				} else {
+					print obsolete "msgid " msgid[0]
+				}
+				for (i = 1; i < t; i++)
+					print obsolete msgid[i]
+			}
+			s = 0
+			continue
+		}
+
+		# Pass everything else verbatim.
+		if ($0 !~ /^#~\|/) {
+			sub(/\r$/, "")
+			print $0
+		}
+		result = getline
+		if (result < 0) break
+	}
 }