1 files changed, 79 insertions, 0 deletions
diff --git a/pkg/prompt/git.go b/pkg/prompt/git.go
new file mode 100644
index 0000000..20f9445
--- /dev/null
+++ b/pkg/prompt/git.go
@@ -0,0 +1,79 @@
+/*******************************************************************************
+*
+* 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 prompt
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+//Returns empty string if `path` is not inside a Git repo.
+func findRepoRootPath(path string) string {
+	_, err := os.Stat(filepath.Join(path, ".git"))
+	if err == nil {
+		return path
+	}
+	if path == "/" {
+		return ""
+	}
+	return findRepoRootPath(filepath.Dir(path))
+}
+
+func getRepoStatusField(repoRootPath string) string {
+	if repoRootPath == "" {
+		return ""
+	}
+
+	bytes, err := ioutil.ReadFile(filepath.Join(repoRootPath, ".git/HEAD"))
+	if err != nil {
+		handleError(err)
+		return withType("git", withColor("1;41", "unknown"))
+	}
+	refSpec := strings.TrimSpace(string(bytes))
+
+	//is current HEAD detached?
+	if !strings.HasPrefix(refSpec, "ref: refs/") {
+		return formatRepoStatusField(withColor("1;41", "detached"), refSpec)
+	}
+
+	//current HEAD is a ref
+	refSpec = strings.TrimPrefix(refSpec, "ref: ")
+	refSpecDisplay := strings.TrimPrefix(refSpec, "refs/")
+	refSpecDisplay = strings.TrimPrefix(refSpecDisplay, "heads/")
+
+	//read file corresponding to refspec to find commit
+	bytes, err = ioutil.ReadFile(filepath.Join(repoRootPath, ".git", refSpec))
+	commitID := strings.TrimSpace(string(bytes))
+	if err != nil {
+		handleError(err)
+		commitID = withColor("1;41", "unknown")
+	}
+
+	return formatRepoStatusField(refSpecDisplay, commitID)
+}
+
+func formatRepoStatusField(refSpec, commitID string) string {
+	//shorten plain commit IDs from 40 to 10 bytes
+	if len(commitID) == 40 && !strings.Contains(commitID, "\x1B") {
+		commitID = commitID[0:10]
+	}
+	return withType("git", refSpec+"/"+commitID)
+}