From 5ebc9f2a5ad207b8621e1aacf7bb23d32a7ce772 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sun, 9 Jul 2017 18:32:20 -0400
Subject: librexgettext: Make the tests pass

---
 src/lib/librexgettext | 84 +++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 68 insertions(+), 16 deletions(-)

diff --git a/src/lib/librexgettext b/src/lib/librexgettext
index cc18999..27a701d 100755
--- a/src/lib/librexgettext
+++ b/src/lib/librexgettext
@@ -40,7 +40,7 @@ fi
 errusage() {
 	if [[ $# -gt 0 ]]; then
 		fmt="$(gettext "$1")"; shift
-		printf "${0##*/}: $fmt\n" "$@"
+		printf "${0##*/}: $fmt\n" "$@" >&2
 	fi
 	usage >&2
 }
@@ -76,6 +76,7 @@ xgettext-sh() {
 }
 
 xgettext-flag() {
+	local file="$1"
 	{
 		# Stage 1: Generate
 		#
@@ -95,9 +96,10 @@ xgettext-flag() {
 		declare -i i
 		for (( i=1; empties < 3; i++ )); do
 			local out
-			out="$(xgettext-sh --keyword="flag:$i,\"$i\"" "$@")"
+			out="$(xgettext-sh --keyword="flag:$i,\"$i\"" -- "$file")"
 			if [[ -n $out ]]; then
 				printf -- '%s\n' "$out"
+				empties=0
 			else
 				empties+=1
 			fi
@@ -130,36 +132,77 @@ xgettext-flag() {
 		#
 		# We do this by simply sorting them by the location
 		# that they appear in the file.  Then, when we see the
-		# argument number go back down to 1, we know that a
-		# new invocation has started!
-		IFS=$'\n'
-		local locations=($(
+		# argument number go back down, we know that a new
+		# invocation has started!
+		local locations=()
+		readarray -t locations < <(
 			local i
 			for i in "${!msgs[@]}"; do
+				local lines=()
+				readarray -t lines < <(printf '%s' "${msgs[$i]}")
+
 				declare -i arg row
-				local lines=(${msgs[$i]})
 				arg=${lines[0]#'#. '}
 				row=${lines[1]##*:}
-				printf '%d.%d %d\n' "$row" "$arg" "$i"
-			done | sort -n
-		))
+
+				printf '%d %d %d\n' "$row" "$arg" "$i"
+			done | sort -k 1n -k 2n
+		)
 		# Stage 4: Output
 		#
 		# Now, we prune out the arguments that aren't
 		# localizable.  Also, remove the "#." comment lines.
 		# As explained above (in stage 3), when we see $arg go
-		# to 1, that's the beginning of a new invocation.
+		# down, that's the beginning of a new invocation.
 		local expectflag=true
+		local prev_arg=0
+		local prev_row=0 # for better error messages only; no real logic
 		local location
 		for location in "${locations[@]}"; do
-			IFS=' .'
+			IFS=' '
 			local row arg i
 			read -r row arg i <<<"$location"
 			local msg="${msgs[$i]#*$'\n'}"
-			# Now we operate based on $row, $arg, and $msg
-			if [[ $arg == 1 ]]; then
-				expectflag=true
+
+			# See if we need to fiddle with $expectflag
+			# (and do some sanity checking).
+			if [[ $arg != "$((prev_arg+1))" ]]; then
+				if ! $expectflag; then
+					local pos
+					if [[ $row != "$prev_row" ]]; then
+						printf -v pos "%s:%d-%d" "$file" "$prev_row" "$row"
+					else
+						printf -v pos "%s:%d" "$file" "$prev_row"
+					fi
+					>&2 printf "%s: $(gettext "flag error: Missing expected flag meaning at argument %d")\n" \
+					    "$pos" "$((prev_arg+1))"
+					exit 1 # $EXIT_FAILURE
+				elif [[ $arg == "$((prev_arg+2))" ]]; then
+					# skipped flag argument
+					expectflag=false
+				elif [[ "$arg" == 1 ]]; then
+					# started new invocation
+					expectflag=true
+				elif [[ $arg == 2 ]]; then
+					# started new invocation and skipped flag argument
+					expectflag=false
+				else
+					local pos
+					if [[ $row != "$prev_row" ]]; then
+						printf -v pos "%s:%d-%d" "$file" "$prev_row" "$row"
+					else
+						printf -v pos "%s:%d" "$file" "$prev_row"
+					fi
+					>&2 printf "%s: $(gettext "flag error: Jumped from argument %d to %d")\n" \
+					    "$pos" "$prev_arg" "$arg"
+					exit 1 # $EXIT_FAILURE
+				fi
 			fi
+			prev_arg=$arg
+			prev_row=$row
+
+			# Now we operate based on $row, $arg, $msg,
+			# and $expectflag.
 			if $expectflag; then
 				IFS=$'\n'
 				local lines=(${msg})
@@ -177,6 +220,12 @@ xgettext-flag() {
 				expectflag=true
 			fi
 		done
+		if ! $expectflag; then
+			>&2 printf "%s:%d: $(gettext "flag error: Missing expected flag meaning at argument %d")\n" \
+			    "$file" "$prev_row" \
+			    "$((prev_arg+1))"
+			exit 1 # $EXIT_FAILURE
+		fi
 	}
 }
 
@@ -186,6 +235,7 @@ whitespace-collapse() {
 }
 
 main() {
+	set -euE -o pipefail
 	local simple=()
 	local prose=()
 	local files=()
@@ -223,7 +273,9 @@ main() {
 	{
 		xgettext-sh "${simple[@]}" -- "${files[@]}"
 		xgettext-sh "${prose[@]}" -- "${files[@]}" | whitespace-collapse
-		xgettext-flag -- "${files[@]}"
+		for file in "${files[@]}"; do
+			xgettext-flag "$file"
+		done
 	} | sed '/^\#, sh-format/d' | msguniq -Fi --to-code=UTF-8
 }
 
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