README: Use italics instead of bold.

README.md

@@ -1,13 +1,24 @@
 # The Music in Noise (Source Code)
 
 This is the source code for my personal website, [The Music in
-Noise](https://themusicinnoise.net/).
+Noise](https://themusicinnoise.net/). The website is statically generated in
+spite of being written in PHP and is compiled with a helpful little script I
+wrote, `phpsg.sh`, which compiles all the code to a static website.
+
+## Building
+
+Dependencies:
+
+- Bash
+- PHP
+- GNU Parallel
+
+Build using the `phpsg.sh` script.
 
 ## Licensing
 
 All documents generated by the website are licensed [CC-BY-ND 4.0
 International](https://creativecommons.org/licenses/by-nd/4.0/deed.en). The
 source code itself is All Rights Reserved unless otherwise specified (e.g. the
-build script). The main reason I publish this is so people can see __how__ I
-make my website and (if they are so inspired) copy the model, __not the
-content__.
+build script). The main reason I publish this is so people can see _how_ I make
+my website and (if they are so inspired) copy the model, _not the content_.

phpsg.sh

@@ -22,14 +22,17 @@
 # 3. This notice may not be removed or altered from any source
 #    distribution.
 
+set -euo pipefail
+
 SOURCE_DIR="src"
 OUTPUT_DIR="output"
+JOBS=1
 
 function print_usage() {
-	echo "$0 [-o <output dir>] [-s <source dir>]"
+	echo "$0 [-o <output dir>] [-s <source dir>] [-j <num>]"
 }
 
-while getopts "o:s:h" opt
+while getopts "o:s:j:h" opt
 do
 	case "$opt" in
 		o)
@@ -38,6 +41,15 @@ do
 		s)
 			SOURCE_DIR="${OPTARG}"
 			;;
+		j)
+			JOBS="${OPTARG}"
+			if ! [[ $JOBS =~ ^[0-9]+$ ]]
+			then
+				>&2 echo "Jobs option '$JOBS' is not an integer."
+				print_usage
+				exit 1
+			fi
+			;;
 		h)
 			print_usage
 			exit
@@ -49,6 +61,10 @@ do
 	esac
 done
 
+# Make these variables visible within parallel
+export OUTPUT_DIR
+export SOURCE_DIR
+
 while IFS= read -r -d '' dir
 do
 	OUT_DIR="${OUTPUT_DIR}/${dir:${#SOURCE_DIR}}"
@@ -58,14 +74,14 @@ do
 	fi
 done < <(find "$SOURCE_DIR" -mindepth 1 -type d -print0)
 
-while IFS= read -r -d '' file
-do
+function process_file() {
+	file="$1"
 	if [[ $file = *.php ]]
 	then
 		DEST_FILE="${OUTPUT_DIR}/${file:${#SOURCE_DIR}:-4}"
 		if ! [ "$file" -nt "$DEST_FILE" ]
 		then
-			continue
+			return
 		fi
 		echo -n "Generating $DEST_FILE ... "
 		php "$file" > "$DEST_FILE"
@@ -74,10 +90,15 @@ do
 		DEST_FILE="${OUTPUT_DIR}/${file:${#SOURCE_DIR}}"
 		if ! [ "$file" -nt "$DEST_FILE" ]
 		then
-			continue
+			return
 		fi
 		echo -n "Copying target $DEST_FILE ... "
 		cp "$file" "$DEST_FILE"
 		echo "done"
 	fi
-done < <(find "$SOURCE_DIR" -type f -not -name '*.cfg.php' -print0)
+}
+# Make function usable to parallel
+export -f process_file
+
+find "$SOURCE_DIR" -type f -not -name '*.cfg.php' |
+	parallel -j"${JOBS}" process_file