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var Q = require('q');
var _ = require('lodash');
var path = require('path');
var crc = require('crc');
var exec = Q.denodeify(require('child_process').exec);
var URI = require('urijs');
var pathUtil = require('./path');
var fs = require('./fs');
var GIT_PREFIX = 'git+';
var GIT_TMP = null;
// Check if an url is a git dependency url
function checkGitUrl(giturl) {
return (giturl.indexOf(GIT_PREFIX) === 0);
}
// Validates a SHA in hexadecimal
function validateSha(str) {
return (/[0-9a-f]{40}/).test(str);
}
// Parse and extract infos
function parseGitUrl(giturl) {
var ref, uri, fileParts, filepath;
if (!checkGitUrl(giturl)) return null;
giturl = giturl.slice(GIT_PREFIX.length);
uri = new URI(giturl);
ref = uri.fragment() || 'master';
uri.fragment(null);
// Extract file inside the repo (after the .git)
fileParts =uri.path().split('.git');
filepath = fileParts.length > 1? fileParts.slice(1).join('.git') : '';
if (filepath[0] == '/') filepath = filepath.slice(1);
// Recreate pathname without the real filename
uri.path(_.first(fileParts)+'.git');
return {
host: uri.toString(),
ref: ref || 'master',
filepath: filepath
};
}
// Clone a git repo from a specific ref
function cloneGitRepo(host, ref) {
var isBranch = false;
ref = ref || 'master';
if (!validateSha(ref)) isBranch = true;
return Q()
// Create temporary folder to store git repos
.then(function() {
if (GIT_TMP) return;
return fs.tmp.dir()
.then(function(_tmp) {
GIT_TMP = _tmp;
});
})
// Return or clone the git repo
.then(function() {
// Unique ID for repo/ref combinaison
var repoId = crc.crc32(host+'#'+ref).toString(16);
// Absolute path to the folder
var repoPath = path.resolve(GIT_TMP, repoId);
return fs.exists(repoPath)
.then(function(doExists) {
if (doExists) return;
// Clone repo
return exec('git clone '+host+' '+repoPath)
.then(function() {
return exec('git checkout '+ref, { cwd: repoPath });
});
})
.thenResolve(repoPath);
});
}
// Get file from a git repo
function resolveFileFromGit(giturl) {
if (_.isString(giturl)) giturl = parseGitUrl(giturl);
if (!giturl) return Q(null);
// Clone or get from cache
return cloneGitRepo(giturl.host, giturl.ref)
.then(function(repo) {
// Resolve relative path
return path.resolve(repo, giturl.filepath);
});
}
// Return root of git repo from a filepath
function resolveGitRoot(filepath) {
var relativeToGit, repoId;
// No git repo cloned, or file is not in a git repository
if (!GIT_TMP || !pathUtil.isInRoot(GIT_TMP, filepath)) return null;
// Extract first directory (is the repo id)
relativeToGit = path.relative(GIT_TMP, filepath);
repoId = _.first(relativeToGit.split(path.sep));
if (!repoId) return;
// Return an absolute file
return path.resolve(GIT_TMP, repoId);
}
module.exports = {
checkUrl: checkGitUrl,
parseUrl: parseGitUrl,
resolveFile: resolveFileFromGit,
resolveRoot: resolveGitRoot
};
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