Add conrefs loader for templating

1 files changed, 72 insertions, 0 deletions

diff --git a/lib/templating/conrefsLoader.js b/lib/templating/conrefsLoader.js
new file mode 100644
index 0000000..e46b4d0
--- /dev/null
+++ b/lib/templating/conrefsLoader.js
@@ -0,0 +1,72 @@
+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 ("")
+*/
+var ConrefsLoader = nunjucks.Loader.extend({
+    async: true,
+
+    init: function(rootFolder, logger) {
+        this.rootFolder = rootFolder;
+        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) {
+                return {
+                    src: source.toString('utf8'),
+                    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.root, from)) {
+            var href = LocationUtils.toAbsolute(to, path.dirname(from), '');
+            return PathUtils.resolveInRoot(this.root, 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;