1 files changed, 67 insertions, 0 deletions
diff --git a/lib/utils/links.js b/lib/utils/links.js
new file mode 100644
index 0000000..e607c94
--- /dev/null
+++ b/lib/utils/links.js
@@ -0,0 +1,67 @@
+var url = require('url');
+var path = require('path');
+
+// Is the link an external link
+var isExternal = function(href) {
+    try {
+        return Boolean(url.parse(href).protocol);
+    } catch(err) { }
+
+    return false;
+};
+
+// Return true if the link is relative
+var isRelative = function(href) {
+    try {
+        var parsed = url.parse(href);
+
+        return !parsed.protocol && parsed.path && parsed.path[0] != '/';
+    } catch(err) {}
+
+    return true;
+};
+
+// Relative to absolute path
+// dir: directory parent of the file currently in rendering process
+// outdir: directory parent from the html output
+
+var toAbsolute = function(_href, dir, outdir) {
+    // Absolute file in source
+    _href = path.join(dir, _href);
+
+    // make it relative to output
+    _href = path.relative(outdir, _href);
+
+    if (process.platform === 'win32') {
+        _href = _href.replace(/\\/g, '/');
+    }
+
+    return _href;
+};
+
+// Join links
+var join = function() {
+    var _href = path.join.apply(path, arguments);
+
+    if (process.platform === 'win32') {
+        _href = _href.replace(/\\/g, '/');
+    }
+
+    return _href;
+};
+
+// Change extension
+var changeExtension = function(filename, newext) {
+    return path.join(
+        path.dirname(filename),
+        path.basename(filename, path.extname(filename))+newext
+    );
+};
+
+module.exports = {
+    isRelative: isRelative,
+    isExternal: isExternal,
+    toAbsolute: toAbsolute,
+    join: join,
+    changeExtension: changeExtension
+};