Update install script.

- Add code to support installation of files in subfolders of dotfiles
content.
- Add code to support patching of JSON files via jq.
- Add code to ensure target directory exists.
- Fix handling of target file paths.
- Remove install_dotfiles function as it is now unused.

install.sh

@@ -1,31 +1,46 @@
 #!/bin/sh -e
 
-install_dotfiles() {
-	local target_dir="$1"
-	for d in dotfiles/*; do
-		cp -v "$d" "${target_dir}/$(basename "$d")"
-	done
-}
 
 install_files() {
 	local target_dir="$1"
-	local source_dir="${2:-.}"
+	local source_dir="$(readlink -f "${2:-.}")"
+	local target_filename_prefix="${3}"
+
+	mkdir -vp "${target_dir}"
+	target_dir="$(readlink -f "${target_dir}")"
+
 	if [ ! -d "${source_dir}" ]; then
 		echo "Source directory ${source_dir} does not exist, skipping."
 		return
 	fi
 	(
 		cd "${source_dir}"
-		for f in *; do
-			case "$f" in
-			^dotfiles)
-				install_dotfiles "${target_dir}"
+		for f in "${source_dir}"/*; do
+			case "$(basename "$f")" in
+			dotfiles)
+				install_files "${target_dir}" "$f" .
+				;;
+			*.jq)
+				tmpfile="$(mktemp)"
+				if [ -f "$f" ]; then
+					tmpfile="$(mktemp)"
+					target_file="${target_dir}/$(basename "$f" .jq)"
+					if [ -f "$target_file" ]; then
+						cat "$target_file"
+					else
+						echo "{}"
+					fi | jq "$(cat "$f")" > "$tmpfile"
+					mv -v "$tmpfile" "$target_file"
+				else
+					echo "Expected source file with .jq extension not to be a directory."
+					exit 1
+				fi
 				;;
 			*)
 				if [ -d "$f" ]; then
-					(cd "$d" && install_files "${target_dir}/$f")
+					install_files "${target_dir}/${target_filename_prefix}$(basename "$f")" "$f"
 				else
-					cp -v "$f" "${target_dir}"
+					cp -v "$f" "${target_dir}/${target_filename_prefix}$(basename "$f")"
 				fi
 				;;
 			esac