clearer separation of concerns when bootstrapping application

pkg/app/errors.go

@@ -0,0 +1,39 @@
+package app
+
+import (
+	"strings"
+
+	"github.com/jesseduffield/generics/slices"
+	"github.com/jesseduffield/lazygit/pkg/i18n"
+)
+
+type errorMapping struct {
+	originalError string
+	newError      string
+}
+
+// knownError takes an error and tells us whether it's an error that we know about where we can print a nicely formatted version of it rather than panicking with a stack trace
+func knownError(tr *i18n.TranslationSet, err error) (string, bool) {
+	errorMessage := err.Error()
+
+	knownErrorMessages := []string{tr.MinGitVersionError}
+
+	if slices.Contains(knownErrorMessages, errorMessage) {
+		return errorMessage, true
+	}
+
+	mappings := []errorMapping{
+		{
+			originalError: "fatal: not a git repository",
+			newError:      tr.NotARepository,
+		},
+	}
+
+	if mapping, ok := slices.Find(mappings, func(mapping errorMapping) bool {
+		return strings.Contains(errorMessage, mapping.originalError)
+	}); ok {
+		return mapping.newError, true
+	}
+
+	return "", false
+}