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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 path.normalize(s).replace(/\\/g, '/');
}
/**
Convert relative to absolute path
@param {String} href
@param {String} dir: directory parent of the file currently in rendering process
@param {String} outdir: directory parent from the html output
@return {String}
*/
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'
@param {String} dir: current directory
@param {String} file: absolute path of file
@return {String}
*/
function relative(dir, file) {
return normalize(path.relative(dir, file));
}
module.exports = {
isExternal: isExternal,
isRelative: isRelative,
isAnchor: isAnchor,
normalize: normalize,
toAbsolute: toAbsolute,
relative: relative
};
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