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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;
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