1 files changed, 46 insertions, 0 deletions
diff --git a/cmd.go b/cmd.go
new file mode 100644
index 0000000..fca36cb
--- /dev/null
+++ b/cmd.go
@@ -0,0 +1,46 @@
+package syw
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"os/exec"
+)
+
+var gitbinpath string
+
+func findbin() string {
+	if gitbinpath == "" {
+		gitbinpath, _ = exec.LookPath("git")
+		if gitbinpath == "" {
+			panic("failed to find 'git' executable")
+		}
+	}
+	return gitbinpath
+}
+
+func runCmd(ctx context.Context, args []string) (*cmdResult, error) {
+	cmd := exec.CommandContext(ctx, findbin(), args...)
+
+	outbuf := &bytes.Buffer{}
+	cmd.Stdout = outbuf
+	errbuf := &bytes.Buffer{}
+	cmd.Stderr = errbuf
+
+	var eerr *exec.ExitError
+	if err := cmd.Run(); err != nil && !errors.As(err, &eerr) {
+		return nil, err
+	}
+
+	return &cmdResult{
+		status: cmd.ProcessState.ExitCode(),
+		out:    outbuf,
+		err:    errbuf,
+	}, nil
+}
+
+type cmdResult struct {
+	status int
+	out    *bytes.Buffer
+	err    *bytes.Buffer
+}