Arrange quoting, use printf, small fixes

gophed

@@ -1,81 +1,78 @@
 #!/bin/sh
 
-PROMPT="=="
-SHOW="show"
+PROMPT='=='
+SHOW='show'
 
 cleanup () {
-	rm -f $TMPFILE;
+	rm -f "$TMPFILE";
 }
 
 go () {
-	printf "${1}\r\n" | nc $2 $3
+	printf '%s\r\n' "$1" | nc "$2" "$3"
 }
 
 usage() {
-	printf "usage: \n"
-	printf "  visit a resource:\n"
-	printf "     $0 <path> <server> <port>\n"
-	printf "  init links:\n"
-	printf "     $0 -i \n"
-	printf "  show this help:\n"
-	printf "   $0 -h\n"
-	printf "\n"
-	printf "In a gopher page, just type:\n"
-	printf "  !./g %% LINE\n"
-	printf "to visit the resource at LINE, or:\n"
-	printf "  !./d %% LINE\n"
-	printf "to download the resource at LINE\n\n"
+	printf '%s\n' \
+	    'usage:' \
+	    '  visit a resource:' \
+	    "     $0 <path> <server> <port>" \
+	    '  init links:' \
+	    "     $0 -i" \
+	    '  show this help:' \
+	    "   $0 -h" \
+	    '' \
+	    'In a gopher page, just type:' \
+	    "  !./g %% LINE" \
+	    'to visit the resource at LINE, or:' \
+	    "  !./d %% LINE" \
+	    'to download the resource at LINE\n'
 	exit 0
 }
 
 trap cleanup INT QUIT HUP KILL ABRT TERM
 
-if [ $# -lt 1 ]; then 
-	usage
-fi
-
-if [ "$1" = "-h" ]; then usage; fi
+[ "$#" -lt 1 ] || [ "$1" = -h ] && usage
 
-if [ "$0" = "gophed" -a "$1" = "-i" ]; then 
-	ln -sf $0 g
-	ln -sf $0 d
-	ln -sf $0 v
+if [ "$0" = gophed ] && [ "$1" = -i ]; then 
+	ln -sf "$0" g
+	ln -sf "$0" d
+	ln -sf "$0" v
 	exit 0
 fi
 
-script_name=$(basename $0)
+script_name="$(basename "$0")"
 
-if [ "${script_name}" = "gophed" -o "${script_name}" = "v" ]; then
-	sel=$(echo $1 | sed -r 's:/:+:g') 
-	TMPFILE=$(mktemp /tmp/gophed_$2_${sel}_$3.XXXXXXXXXXXXXXXXXXX)
-	go "$1" "$2" "$3" > $TMPFILE
-	cat $SHOW - | ed -p ${PROMPT} $TMPFILE 
+if [ "$script_name" = gophed ] || [ "$script_name" = v ]; then
+	sel="$(printf '%s' "$1" | sed -r 's:/:+:g')"
+	TMPFILE="$(mktemp "/tmp/gophed_${2}_${sel}_$3.XXXXXXXXXXXXXXXXXXX")"
+	go "$1" "$2" "$3" > "$TMPFILE"
+	cat "$SHOW" - | ed -p "$PROMPT" "$TMPFILE"
 	cleanup
 	exit 0
 fi
 
-if [ ${script_name} = "g" -o ${script_name} = "d" ]; then 
-	LINE=$(awk "{if (NR == $2) print \$0;}" $1)
-	RESOURCE=$(echo "$LINE" | cut -d '	' -f 2)
-	HOST=$(echo "$LINE" | cut -d '	' -f 3)
-	PORT=$(echo "$LINE" | awk -F '	' '{ match($4,/[[:digit:]]+/); print substr($4,RSTART,RLENGTH) }')
+if [ "$script_name" = g ] || [ "$script_name" = d ]; then 
+	LINE="$(awk "{if (NR == '$2') print '$0';}" "$1")"
+	RESOURCE="$(printf '%s' "$LINE" | cut -d '	' -f 2)"
+	HOST="$(printf '%s' "$LINE" | cut -d '	' -f 3)"
+	PORT="$(printf '%s' "$LINE" | awk -F '	' '{ match($4,/[[:digit:]]+/); print substr($4,RSTART,RLENGTH) }')"
 	
-	if [ "${script_name}"  = "g" ]; then 
-			SEL=$(echo $RESOURCE | sed -r 's:/:+:g') 
-			TMPFILE=$(mktemp /tmp/gophed_${HOST}_${SEL}_${PORT}.XXXXXXXXXXXXXXXXXXX)
-			go "$RESOURCE" "$HOST" "$PORT" > $TMPFILE
-			cat $SHOW - | ed -p ${PROMPT} $TMPFILE
+	if [ "$script_name" = g ]; then 
+		SEL="$(printf '%s' "$RESOURCE" | sed -r 's:/:+:g')"
+		TMPFILE="$(mktemp "/tmp/gophed_${HOST}_${SEL}_$PORT.XXXXXXXXXXXXXXXXXXX")"
+		go "$RESOURCE" "$HOST" "$PORT" > "$TMPFILE"
+		cat "$SHOW" - | ed -p "$PROMPT" "$TMPFILE"
 	fi
-	if [ "${script_name}" =  "d" ]; then
-			DIR_RESOURCE=$(dirname $RESOURCE)
-			echo "Download $RESOURCE in ${HOST}${RESOURCE}"
-			mkdir -p "$HOST/$DIR_RESOURCE"
-			go "$RESOURCE" "$HOST" "$PORT" > "${HOST}${RESOURCE}"
+	if [ "$script_name" = d ]; then
+		DIR_RESOURCE="$(dirname "$RESOURCE")"
+		printf 'Download %s in %s\n' "$RESOURCE" "$HOST$RESOURCE"
+		mkdir -p "$HOST/$DIR_RESOURCE"
+		go "$RESOURCE" "$HOST" "$PORT" > "$HOST$RESOURCE"
 	fi
 	cleanup
 	exit 0
 fi
-echo "${scriptname}: command not found"
+printf '%s: command not found\n' "$scriptname"
 
 cleanup