Splits up file into smaller files

Closes issue #9

inc/tag-management

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+
+assignTags(){
+	local filename
+	local tags
+	local tagIDs
+	local tagIDsOr
+	local fileID
+	filename="$(findFile "$1")"
+	[ ! -e "$filename" ] && exit 1
+	tags="$(cat - | sed '/^$/d')"
+	fileID="$(findFileId "$filename")"
+	# If there are tags
+	if [ -n "$tags" ]; then
+		local values
+		local orlist
+		while read -r line; do
+			values+=",('$(safeSQL "$line")')"
+			orlist+=" OR name = '$(safeSQL "$line")'"
+		done <<<"$(echo "$tags")"
+		values="$(echo "$values" | sed 's/^,//')"
+		orlist="$(echo "$orlist" | sed 's/^ OR //')"
+		
+		# Ensure that all the tags exist
+		echo "INSERT INTO tags (name) VALUES $values
+			EXCEPT SELECT name FROM tags;" |
+				sqlite3 "${sqliteFile}"
+
+		# Get the tag ids we need to assosiate with the current file
+		tagIDs="$(echo "SELECT id FROM tags WHERE $orlist" |
+			sqlite3 "${sqliteFile}")"
+		
+		#Loop through them all
+		while read -r tagID; do
+			tagIDsOr+=" OR tagID = $(safeSQL "$tagID")"
+			
+			# Check the tag is already linkded with the file
+			local existing
+			existing="$(echo "SELECT id FROM links
+				WHERE itemID = $(safeSQL "$fileID")
+				AND tagID = $(safeSQL "$tagID")" |
+				sqlite3 "${sqliteFile}"
+			)"
+
+			# If not, add a link
+			if [ -z "$existing" ]; then
+				echo "INSERT INTO links (itemID,tagID)
+				VALUES ($(safeSQL "$fileID"),$(safeSQL "$tagID"))" |
+				sqlite3 "${sqliteFile}"
+			fi
+		done <<<"$(echo "$tagIDs")"
+		tagIDsOr="$(echo "$tagIDsOr" | sed 's/^ OR //')"
+
+		# Delete any links that are not in the list
+		echo "DELETE FROM links
+		WHERE itemID = $(safeSQL "$fileID")
+		AND NOT ( $tagIDsOr )" |
+		sqlite3 "${sqliteFile}"
+
+	else # If there are no tags, simply delete any that are referenced
+		echo "DELETE FROM links WHERE itemID = '$(safeSQL "$fileID")'" |
+			sqlite3 "${sqliteFile}"
+	fi
+	
+
+}