100 lines
3.3 KiB
JavaScript
100 lines
3.3 KiB
JavaScript
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'use strict'
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const path = require('path')
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const fs = require('graceful-fs')
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const pathExists = require('../path-exists').pathExists
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/**
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* Function that returns two types of paths, one relative to symlink, and one
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* relative to the current working directory. Checks if path is absolute or
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* relative. If the path is relative, this function checks if the path is
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* relative to symlink or relative to current working directory. This is an
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* initiative to find a smarter `srcpath` to supply when building symlinks.
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* This allows you to determine which path to use out of one of three possible
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* types of source paths. The first is an absolute path. This is detected by
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* `path.isAbsolute()`. When an absolute path is provided, it is checked to
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* see if it exists. If it does it's used, if not an error is returned
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* (callback)/ thrown (sync). The other two options for `srcpath` are a
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* relative url. By default Node's `fs.symlink` works by creating a symlink
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* using `dstpath` and expects the `srcpath` to be relative to the newly
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* created symlink. If you provide a `srcpath` that does not exist on the file
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* system it results in a broken symlink. To minimize this, the function
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* checks to see if the 'relative to symlink' source file exists, and if it
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* does it will use it. If it does not, it checks if there's a file that
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* exists that is relative to the current working directory, if does its used.
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* This preserves the expectations of the original fs.symlink spec and adds
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* the ability to pass in `relative to current working direcotry` paths.
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*/
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function symlinkPaths (srcpath, dstpath, callback) {
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if (path.isAbsolute(srcpath)) {
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return fs.lstat(srcpath, (err, stat) => {
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if (err) {
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err.message = err.message.replace('lstat', 'ensureSymlink')
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return callback(err)
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}
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return callback(null, {
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'toCwd': srcpath,
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'toDst': srcpath
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})
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})
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} else {
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const dstdir = path.dirname(dstpath)
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const relativeToDst = path.join(dstdir, srcpath)
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return pathExists(relativeToDst, (err, exists) => {
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if (err) return callback(err)
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if (exists) {
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return callback(null, {
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'toCwd': relativeToDst,
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'toDst': srcpath
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})
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} else {
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return fs.lstat(srcpath, (err, stat) => {
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if (err) {
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err.message = err.message.replace('lstat', 'ensureSymlink')
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return callback(err)
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}
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return callback(null, {
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'toCwd': srcpath,
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'toDst': path.relative(dstdir, srcpath)
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})
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})
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}
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})
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}
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}
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function symlinkPathsSync (srcpath, dstpath) {
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let exists
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if (path.isAbsolute(srcpath)) {
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exists = fs.existsSync(srcpath)
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if (!exists) throw new Error('absolute srcpath does not exist')
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return {
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'toCwd': srcpath,
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'toDst': srcpath
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}
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} else {
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const dstdir = path.dirname(dstpath)
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const relativeToDst = path.join(dstdir, srcpath)
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exists = fs.existsSync(relativeToDst)
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if (exists) {
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return {
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'toCwd': relativeToDst,
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'toDst': srcpath
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}
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} else {
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exists = fs.existsSync(srcpath)
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if (!exists) throw new Error('relative srcpath does not exist')
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return {
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'toCwd': srcpath,
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'toDst': path.relative(dstdir, srcpath)
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}
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}
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}
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}
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module.exports = {
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symlinkPaths,
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symlinkPathsSync
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}
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