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/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
package main
import (
"bytes"
"os/exec"
"regexp"
"strings"
)
//remoteAlias describes an alias that can be used in a Git remote URL (as
//defined by the "url.<base>.insteadOf" directive in man:git-config(1)).
type remoteAlias struct {
Alias string
Replacement string
}
var remoteAliases []*remoteAlias
func init() {
cmd := exec.Command("git", "config", "--global", "-l")
var buf bytes.Buffer
cmd.Stdout = &buf
FatalIfError(cmd.Run())
rx := regexp.MustCompile(`^url\.([^=]+)\.insteadof=(.+)$`)
for _, line := range strings.Split(string(buf.Bytes()), "\n") {
match := rx.FindStringSubmatch(line)
if match == nil {
continue
}
remoteAliases = append(remoteAliases, &remoteAlias{
Alias: match[2],
Replacement: match[1],
})
}
}
//ExpandRemoteURL derive the canonical URL for a given remote by substituting
//aliases defined in the system-wide and user-global Git config. For example,
//with
//
// $ cat /etc/gitconfig
// [url "git://github.com/"]
// insteadOf = gh:
//
//and the input "gh:foo/bar", this function returns "git://github.com/foo/bar".
func ExpandRemoteURL(url string) string {
var best *remoteAlias
for _, current := range remoteAliases {
if strings.HasPrefix(url, current.Alias) {
if best == nil || len(best.Alias) < len(current.Alias) {
best = current
}
}
}
if best == nil {
return url
}
return best.Replacement + strings.TrimPrefix(url, best.Alias)
}
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