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var path = require('path');
var nunjucks = require('nunjucks');
var Git = require('../utils/git');
var pathUtil = require('../utils/path');
// The loader should handle relative and git url
var Loader = nunjucks.Loader.extend({
async: true,
init: function(engine, opts) {
this.engine = engine;
this.book = engine.book;
this.fs = engine.book.fs;
this.git = new Git(this.fs.tmpdir());
},
getSource: function(sourceURL, callback) {
var that = this;
this.git.resolve(sourceURL)
.then(function(filepath) {
// Is local file
if (!filepath) {
filepath = that.book.resolve(sourceURL);
} else {
that.book.log.debug.ln('resolve from git', sourceURL, 'to', filepath);
}
// Read file from absolute path
return that.fs.readAsString(filepath)
.then(function(source) {
return that.engine.interpolate(filepath, source);
})
.then(function(source) {
return {
src: source,
path: filepath,
// We disable cache since content is modified (shortcuts, ...)
noCache: true
};
});
})
.nodeify(callback);
},
resolve: function(from, to) {
// If origin is in the book, we enforce result file to be in the book
if (this.book.isInBook(from)) {
return this.book.resolve(
this.book.relative(path.dirname(from)),
to
);
}
// If origin is in a git repository, we resolve file in the git repository
var gitRoot = this.git.resolveRoot(from);
if (gitRoot) {
return pathUtil.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'
// Only git urls are considered as absolute
isRelative: function(filename) {
return !Git.isUrl(filename);
}
});
module.exports = Loader;
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