Resolves #122: remove deprecated substitute pkg, add regexparam instead

lib/index.js

@@ -4,7 +4,7 @@ const path = require('path');
 const debug = require('debug')('@metalsmith/permalinks');
 const moment = require('moment');
 const slugify = require('slugify');
-const substitute = require('substitute');
+const route = require('regexparam');
 
 const error = debug.extend('error');
 
@@ -210,7 +210,8 @@ const resolve = str => {
  */
 const replace = (pattern, data, options) => {
   if (!pattern) return null;
-  const keys = params(pattern);
+  const parsed = route.parse(pattern);
+  const keys = parsed.keys
   const ret = {};
 
   for (let i = 0, key; (key = keys[i++]); ) {
@@ -223,21 +224,10 @@ const replace = (pattern, data, options) => {
     }
   }
 
-  return substitute(pattern, ret);
-};
-
-/**
- * Get the params from a `pattern` string.
- *
- * @param {string} pattern
- * @return {Array}
- */
-const params = pattern => {
-  const matcher = /:(\w+)/g;
-  const ret = [];
-  let m;
-  while ((m = matcher.exec(pattern))) ret.push(m[1]);
-  return ret;
+  const transformed = route.inject(pattern, ret)
+  // handle absolute paths
+  if (transformed.startsWith('/')) return transformed.slice(1)
+  return transformed
 };
 
 /**