config: add reload helper functions

Add reload helper function to reload config files. Store the initially
used config files for the reloading.

Signed-off-by: Koni Marti <koni.marti@gmail.com>
Tested-by: Inwit <inwit@sindominio.net>
Acked-by: Robin Jarry <robin@jarry.cc>

4 files changed, 77 insertions, 4 deletions

diff --git a/config/binds.go b/config/binds.go
index 1d391af7..3305fd3a 100644
--- a/config/binds.go
+++ b/config/binds.go
@@ -163,7 +163,7 @@ func parseBinds(root string, filename string) error {
 			}
 		}
 	}
-
+	SetBindsFilename(filename)
 	if err := parseBindsFromFile(root, filename); err != nil {
 		return fmt.Errorf("%s: %w", filename, err)
 	}
diff --git a/config/config.go b/config/config.go
index 61ac041e..6bab5fc8 100644
--- a/config/config.go
+++ b/config/config.go
@@ -134,6 +134,7 @@ func LoadConfigFromFile(
 			}
 		}
 	}
+	SetConfFilename(filename)
 	if err := parseConf(filename); err != nil {
 		return fmt.Errorf("%s: %w", filename, err)
 	}
diff --git a/config/reload.go b/config/reload.go
new file mode 100644
index 00000000..f572cea1
--- /dev/null
+++ b/config/reload.go
@@ -0,0 +1,68 @@
+package config
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"git.sr.ht/~rjarry/aerc/lib/log"
+)
+
+type reloadStore struct {
+	binds string
+	conf  string
+}
+
+var rlst reloadStore
+
+func SetBindsFilename(fn string) {
+	log.Debugf("reloader: set binds file: %s", fn)
+	rlst.binds = fn
+}
+
+func SetConfFilename(fn string) {
+	log.Debugf("reloader: set conf file: %s", fn)
+	rlst.conf = fn
+}
+
+func ReloadBinds() (string, error) {
+	f := rlst.binds
+	if !exists(f) {
+		return f, os.ErrNotExist
+	}
+	log.Debugf("reload binds file: %s", f)
+	Binds = defaultBindsConfig()
+	return f, parseBindsFromFile(filepath.Dir(f), f)
+}
+
+func ReloadConf() (string, error) {
+	f := rlst.conf
+	if !exists(f) {
+		return f, os.ErrNotExist
+	}
+	log.Debugf("reload conf file: %s", f)
+
+	General = new(GeneralConfig)
+	Filters = nil
+	Compose = new(ComposeConfig)
+	Converters = make(map[string]string)
+	Viewer = new(ViewerConfig)
+	Statusline = new(StatuslineConfig)
+	Openers = nil
+	Hooks = HooksConfig{}
+	Ui = defaultUIConfig()
+	Templates = new(TemplateConfig)
+
+	return f, parseConf(f)
+}
+
+func ReloadAccounts() error {
+	return errors.New("not implemented")
+}
+
+func exists(fn string) bool {
+	if _, err := os.Stat(fn); errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+	return true
+}
diff --git a/config/ui.go b/config/ui.go
index 9839db9b..578ad294 100644
--- a/config/ui.go
+++ b/config/ui.go
@@ -134,9 +134,13 @@ type uiContextKey struct {
 	value   string
 }
 
-var Ui = &UIConfig{
-	contextualCounts: make(map[uiContextType]int),
-	contextualCache:  make(map[uiContextKey]*UIConfig),
+var Ui = defaultUIConfig()
+
+func defaultUIConfig() *UIConfig {
+	return &UIConfig{
+		contextualCounts: make(map[uiContextType]int),
+		contextualCache:  make(map[uiContextKey]*UIConfig),
+	}
 }
 
 var uiContextualSectionRe = regexp.MustCompile(`^ui:(account|folder|subject)([~=])(.+)$`)