[general] initial methods for easily getting changed files

general/gochanges.go

@@ -0,0 +1,39 @@
+package general
+
+import (
+	"bytes"
+"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+// RunCommand is a simple wrapper to run commands
+func RunCommand(command string, values ...string) string {
+	cmd := exec.Command(command, values...)
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	err := cmd.Run()
+	if err != nil {
+		panic(err)
+	}
+	return out.String()
+}
+
+// GetChangedGoFiles returns a list of changed .go files
+// anything else is filtered out
+func GetChangedGoFiles() (result []string) {
+	gitDir := RunCommand("git", "rev-parse", "--git-dir")
+	gitDiff := RunCommand("git", "diff", "--name-only", "--cached", "--diff-filter=ACM")
+	absolutePath := filepath.Dir(gitDir)
+
+	resultLines := strings.Split(gitDiff, "\n")
+	if resultLines == nil {
+		return
+	}
+	for _, filename := range resultLines {
+		if filename != "" && strings.HasSuffix(filename, ".go") {
+			result = append(result, absolutePath+"/"+filename)
+		}
+	}
+	return result
+}