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shell-scripts.d/xpath.sh

@@ -1,35 +1,38 @@
 #!/bin/bash
 
-# An interactive xpath query tool
+# An interactive xpath query commandline tool.
+# Stores your previous query.
 
+# File for previous query
 touch .prev-xpath.tmp
 
+# Colored output
 GREEN='\033[0;32m'
 NC='\033[0m' # no color
 
+# Ask for canto file
 clear
 read -p "Choose a canto: [i,r,p][1-34] " CANTO
 CANTICLE="$(echo $CANTO | tr -d -c a-z)"
 CANTO_NUM="$(echo $CANTO | tr -d -c 0-9)"
 
-file="-${CANTO_NUM}.xml"
-
+# Create complete filename
 if [[ "$CANTICLE" == 'i' ]]; then
 	CANTICLE='Inferno'
-	file="inferno${file}"
+	file="inferno-${CANTO_NUM}.xml"
 elif [[ "$CANTICLE" == 'r' ]]; then
 	CANTICLE='Purgatorio'
-	file="purgatorio${file}"
+	file="purgatorio-${CANTO_NUM}.xml"
 elif [[ "$CANTICLE" == 'p' ]]; then
 	CANTICLE='Paradiso'
-	file="paradiso${file}"
+	file="paradiso-${CANTO_NUM}.xml"
 else
 	echo "Not a valid canto file: $file"
 fi
 
+# Start interactive query
 if [[ -e "$file" ]]; then
 	clear && echo -e "You are searching ${CANTICLE^} ${CANTO_NUM}.\nAdd a trailing slash ${GREEN}\`/\`${NC} to your search before submitting it. The default first two search choices are ${GREEN}\`canto\`${NC} and then ${GREEN}\`terzine\`${NC}. Press ${GREEN}<enter>${NC} for those defaults and type something else to search that.\n"
-	i='0'
 	read -p "Load previous: (Y)/n " PREV
 	case "$PREV" in
 		N|n)
@@ -39,19 +42,22 @@ if [[ -e "$file" ]]; then
 			search="$(cat .prev-xpath.tmp)"
 			;;
 	esac
+	i='0'
+	# Start while loop for the query. Break the loop if the query ends with a slash `/`.
 	while true; do
 		read -e -i "$search" -p "$(echo -e "\nSearch: \n  "${GREEN}"===> "${NC})" nsearch
-		if [[ "${nsearch: -1}" == '/' ]]; then			# if last char trailing slash then search
-			path="${nsearch::-1}"
-			echo "$path" > .prev-xpath.tmp			# remove trailing slash
-			xmllint --xpath "$path" $file | batcat -l 'xml'
+		if [[ "${nsearch: -1}" == / ]]; then		# if last char trailing slash then search
+			path="${nsearch::-1}"			# remove trailing slash
+			echo "$path" > .prev-xpath.tmp		# store query for next time
+			# perform the search (requires `xmllint` and `batcat` pager)
+			xmllint --xpath "$path" $file | batcat -l xml
 			exit
-		elif [[ "$i" == '0' ]] && [[ "$nsearch" == '' ]]; then
+		elif [[ "$i" == 0 ]] && [[ "$nsearch" == '' ]]; then 	# load '/canto' query on first loop
 			search="/canto"
-		elif [[ "$nsearch" == '/canto' ]]; then
+		elif [[ "$nsearch" == '/canto' ]]; then			# load '/canto/terzine' on second loop
 			search="/canto/terzine"
 		else
-			search="${nsearch}"
+			search="${nsearch}"				# else keep search the same
 		fi
 		i=$[$i+1]
 	done