1 files changed, 70 insertions, 0 deletions
diff --git a/lib/utils/location.js b/lib/utils/location.js
new file mode 100644
index 0000000..ba0c57d
--- /dev/null
+++ b/lib/utils/location.js
@@ -0,0 +1,70 @@
+var url = require('url');
+var path = require('path');
+
+// Is the url an external url
+function isExternal(href) {
+    try {
+        return Boolean(url.parse(href).protocol);
+    } catch(err) {
+        return false;
+    }
+}
+
+// Inverse of isExternal
+function isRelative(href) {
+    return !isExternal(href);
+}
+
+// Return true if the link is an achor
+function isAnchor(href) {
+    try {
+        var parsed = url.parse(href);
+        return !!(!parsed.protocol && !parsed.path && parsed.hash);
+    } catch(err) {
+        return false;
+    }
+}
+
+// Normalize a path to be a link
+function normalize(s) {
+    return s.replace(/\\/g, '/');
+}
+
+// Convert relative to absolute path
+// dir: directory parent of the file currently in rendering process
+// outdir: directory parent from the html output
+function toAbsolute(_href, dir, outdir) {
+    if (isExternal(_href)) return _href;
+    outdir = outdir == undefined? dir : outdir;
+    
+    _href = normalize(_href);
+    dir = normalize(dir);
+    outdir = normalize(outdir);
+
+    // Path "_href" inside the base folder
+    var hrefInRoot = path.normalize(path.join(dir, _href));
+    if (_href[0] == '/') hrefInRoot = path.normalize(_href.slice(1));
+
+    // Make it relative to output
+    _href = path.relative(outdir, hrefInRoot);
+
+    // Normalize windows paths
+    _href = normalize(_href);
+
+    return _href;
+}
+
+// Convert an absolute path to a relative path for a specific folder (dir)
+// ('test/', 'hello.md') -> '../hello.md'
+function relative(dir, file) {
+    return normalize(path.relative(dir, file));
+}
+
+module.exports = {
+    isExternal: isExternal,
+    isRelative: isRelative,
+    isAnchor: isAnchor,
+    normalize: normalize,
+    toAbsolute: toAbsolute,
+    relative: relative
+};