1 files changed, 93 insertions, 0 deletions
diff --git a/packages/gitbook/lib/templating/conrefsLoader.js b/packages/gitbook/lib/templating/conrefsLoader.js
new file mode 100644
index 0000000..b3cdb3f
--- /dev/null
+++ b/packages/gitbook/lib/templating/conrefsLoader.js
@@ -0,0 +1,93 @@
+var path = require('path');
+var nunjucks = require('nunjucks');
+
+var fs = require('../utils/fs');
+var Git = require('../utils/git');
+var LocationUtils = require('../utils/location');
+var PathUtils = require('../utils/path');
+
+
+/**
+ * Template loader resolving both:
+ *      - relative url ("./test.md")
+ *      - absolute url ("/test.md")
+ *      - git url ("")
+ *
+ * @param {String} rootFolder
+ * @param {Function(filePath, source)} transformFn (optional)
+ * @param {Logger} logger (optional)
+ */
+var ConrefsLoader = nunjucks.Loader.extend({
+    async: true,
+
+    init: function(rootFolder, transformFn, logger) {
+        this.rootFolder = rootFolder;
+        this.transformFn = transformFn;
+        this.logger = logger;
+        this.git = new Git();
+    },
+
+    getSource: function(sourceURL, callback) {
+        var that = this;
+
+        this.git.resolve(sourceURL)
+        .then(function(filepath) {
+            // Is local file
+            if (!filepath) {
+                filepath = path.resolve(sourceURL);
+            } else {
+                if (that.logger) that.logger.debug.ln('resolve from git', sourceURL, 'to', filepath);
+            }
+
+            // Read file from absolute path
+            return fs.readFile(filepath)
+            .then(function(source) {
+                source = source.toString('utf8');
+
+                if (that.transformFn) {
+                    return that.transformFn(filepath, source);
+                }
+
+                return source;
+            })
+            .then(function(source) {
+                return {
+                    src: source,
+                    path: filepath
+                };
+            });
+        })
+        .nodeify(callback);
+    },
+
+    resolve: function(from, to) {
+        // If origin is in the book, we enforce result file to be in the book
+        if (PathUtils.isInRoot(this.rootFolder, from)) {
+
+            // Path of current template in the rootFolder (not absolute to fs)
+            var fromRelative = path.relative(this.rootFolder, from);
+
+            // Resolve "to" to a filepath relative to rootFolder
+            var href = LocationUtils.toAbsolute(to, path.dirname(fromRelative), '');
+
+            // Return absolute path
+            return PathUtils.resolveInRoot(this.rootFolder, href);
+        }
+
+        // If origin is in a git repository, we resolve file in the git repository
+        var gitRoot = this.git.resolveRoot(from);
+        if (gitRoot) {
+            return PathUtils.resolveInRoot(gitRoot, to);
+        }
+
+        // If origin is not in the book (include from a git content ref)
+        return path.resolve(path.dirname(from), to);
+    },
+
+    // Handle all files as relative, so that nunjucks pass responsability to 'resolve'
+    isRelative: function(filename) {
+        return LocationUtils.isRelative(filename);
+    }
+});
+
+module.exports = ConrefsLoader;