rename pkg/ to internal/

1 files changed, 75 insertions, 0 deletions

diff --git a/internal/rtree/remote.go b/internal/rtree/remote.go
new file mode 100644
index 0000000..0c4e880
--- /dev/null
+++ b/internal/rtree/remote.go
@@ -0,0 +1,75 @@
+/*******************************************************************************
+*
+* 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 rtree
+
+import (
+	"net/url"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+//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(remoteURL string) string {
+	var best *RemoteAlias
+	for _, current := range RemoteAliases {
+		if strings.HasPrefix(remoteURL, current.Alias) {
+			if best == nil || len(best.Alias) < len(current.Alias) {
+				best = current
+			}
+		}
+	}
+	if best == nil {
+		return remoteURL
+	}
+	return best.Replacement + strings.TrimPrefix(remoteURL, best.Alias)
+}
+
+//This regex recognizes the scp-like syntax for git remotes
+//(i.e. "[user@]example.org:path/to/repo") as specified by the "GIT URLS"
+//section of man:git-clone(1).
+var scpSyntaxRx = regexp.MustCompile(`^(?:[^/@:]+@)?([^/:]+\.[^/:]+):(.+)$`)
+
+//CheckoutPathForRemoteURL derives the checkout path for a remote URL that has
+//already been expanded with ExpandRemoteURL() if necessary.
+//
+//  "https://example.org/foo/bar" -> "example.org/foo/bar"
+//  "git@example.org:foo/bar"     -> "example.org/foo/bar"
+//
+func CheckoutPathForRemoteURL(remoteURL string) (string, error) {
+	match := scpSyntaxRx.FindStringSubmatch(remoteURL)
+	if match != nil {
+		//match[1] is the hostname, match[2] is the path to the repo
+		return filepath.Join(match[1], match[2]), nil
+	}
+
+	u, err := url.Parse(remoteURL)
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(u.Hostname(), u.Path), nil
+}