nvchecker: add enigma

.repo/nvchecker.toml

@@ -1265,6 +1265,10 @@ pypi = "pytest-check"
 #source = "cmd"
 #cmd = './.repo/pkgver/firefox-nightly-en-gb.sh'
 
+[enigma]
+source = "cmd"
+cmd = "./.repo/pkgver/enigma.sh"
+
 [samhain]
 source = "cmd"
 cmd = "./.repo/pkgver/samhain.sh"

.repo/pkgver/enigma.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+set -e
+
+# check dependencies
+count=0
+for dependency in curl hxnormalize hxselect grep sed; do
+	if [ ! -x "$(command -v $dependency)" ]; then
+		echo "$dependency missing"
+		count=$((count+1))
+	fi
+done
+
+# exit script if any dependencies missing
+if [ $count -ne 0 ]; then
+	exit 1
+fi
+
+# upstream URL
+UPSTREAM_URL="https://www.chiark.greenend.org.uk/~sgtatham/enigma/"
+
+# options to pass to cURL, including custom user agent
+USER_AGENT="enigma-version-checker/1.0 george@rawlinson.net.nz"
+CURL_OPTS=(--silent --user-agent "$USER_AGENT")
+
+curl "${CURL_OPTS[@]}" "$UPSTREAM_URL" | \
+	hxnormalize -x | \
+	hxselect -c 'a' -s '\n' | \
+	grep .tar.gz | \
+	sed -e "s/.*enigma-//" -e "s/\.tar.gz.*//"
+exit 0