Add diff-highlight setup script

diff-highlight.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+set -e
+
+# don't build diff-highlight if it's already in PATH
+if type diff-highlight >/dev/null 2>&1; then
+	return
+fi
+
+# create temp directory
+pushd "$(mktemp -d)" >/dev/null
+
+# copy the diff-highlight source files distributed with git to this temp
+# directory and build it
+cp -R --preserve=mode,timestamps "$(dpkg -L git | grep diff-highlight | head -1)"/* .
+make --quiet
+
+# move the created script to ~/.bin, which is in PATH
+mv diff-highlight ~/.bin
+
+# remove the temp directory and move back to the previous directory
+rm -rf "$(pwd)"
+popd >/dev/null

setup.sh

@@ -16,6 +16,7 @@ POST_SETUP_SCRIPTS=(
 	vscode.sh         # install vscode configs
 	ssh.sh            # set up SSH config and create key if needed
 	gpg.sh            # create GPG key if needed
+	diff-highlight.sh # build diff-highlight script from git source
 )
 
 # read file basenames to copy_files array