big refactor to give our enums actual types

pkg/gui/errors.go

@@ -0,0 +1,42 @@
+package gui
+
+import "github.com/go-errors/errors"
+
+// SentinelErrors are the errors that have special meaning and need to be checked
+// by calling functions. The less of these, the better
+type SentinelErrors struct {
+	ErrSubProcess error
+	ErrNoFiles    error
+	ErrSwitchRepo error
+	ErrRestart    error
+}
+
+const UNKNOWN_VIEW_ERROR_MSG = "unknown view"
+
+// GenerateSentinelErrors makes the sentinel errors for the gui. We're defining it here
+// because we can't do package-scoped errors with localization, and also because
+// it seems like package-scoped variables are bad in general
+// https://dave.cheney.net/2017/06/11/go-without-package-scoped-variables
+// In the future it would be good to implement some of the recommendations of
+// that article. For now, if we don't need an error to be a sentinel, we will just
+// define it inline. This has implications for error messages that pop up everywhere
+// in that we'll be duplicating the default values. We may need to look at
+// having a default localisation bundle defined, and just using keys-only when
+// localising things in the code.
+func (gui *Gui) GenerateSentinelErrors() {
+	gui.Errors = SentinelErrors{
+		ErrSubProcess: errors.New(gui.Tr.RunningSubprocess),
+		ErrNoFiles:    errors.New(gui.Tr.NoChangedFiles),
+		ErrSwitchRepo: errors.New("switching repo"),
+		ErrRestart:    errors.New("restarting"),
+	}
+}
+
+func (gui *Gui) sentinelErrorsArr() []error {
+	return []error{
+		gui.Errors.ErrSubProcess,
+		gui.Errors.ErrNoFiles,
+		gui.Errors.ErrSwitchRepo,
+		gui.Errors.ErrRestart,
+	}
+}