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40 lines
1.1 KiB
40 lines
1.1 KiB
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module.exports = link
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link.ifExists = linkIfExists
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var fs = require("graceful-fs")
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, chain = require("slide").chain
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, mkdir = require("mkdirp")
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, rm = require("./gently-rm.js")
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, path = require("path")
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, npm = require("../npm.js")
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function linkIfExists (from, to, gently, cb) {
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fs.stat(from, function (er) {
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if (er) return cb()
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link(from, to, gently, cb)
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})
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}
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function link (from, to, gently, abs, cb) {
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if (typeof cb !== "function") cb = abs, abs = false
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if (typeof cb !== "function") cb = gently, gently = null
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if (npm.config.get("force")) gently = false
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to = path.resolve(to)
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var target = from = path.resolve(from)
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if (!abs && process.platform !== "win32") {
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// junctions on windows must be absolute
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target = path.relative(path.dirname(to), from)
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// if there is no folder in common, then it will be much
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// longer, and using a relative link is dumb.
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if (target.length >= from.length) target = from
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}
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chain
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( [ [fs, "stat", from]
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, [rm, to, gently]
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, [mkdir, path.dirname(to)]
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, [fs, "symlink", target, to, "junction"] ]
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, cb)
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}
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