Allow custom spinner via config file

Allows to set `ui.spinner=` to a string which is then split by
`ui.spinner-delimiter=` (Default: comma) instead of having a hard coded
animation.

This implementation doesn't use INIs capabilities to split strings as
it trims whitespaces breaking the default animation.

Signed-off-by: Paul Spooren <mail@aparcar.org>

config/config.go

@@ -33,6 +33,8 @@ type UIConfig struct {
 	EmptyDirlist      string   `ini:"empty-dirlist"`
 	MouseEnabled      bool     `ini:"mouse-enabled"`
 	NewMessageBell    bool     `ini:"new-message-bell"`
+	Spinner           string   `ini:"spinner"`
+	SpinnerDelimiter  string   `ini:"spinner-delimiter"`
 }
 
 const (
@@ -347,6 +349,9 @@ func LoadConfigFromFile(root *string, sharedir string) (*AercConfig, error) {
 			EmptyDirlist:      "(no folders)",
 			MouseEnabled:      false,
 			NewMessageBell:    true,
+			Spinner:
+				 "[..]    , [..]   ,  [..]  ,   [..] ,    [..],   [..] ,  [..]  , [..]   ",
+			SpinnerDelimiter: ",",
 		},
 
 		Viewer: ViewerConfig{

doc/aerc-config.5.scd

@@ -110,6 +110,21 @@ These options are configured in the *[ui]* section of aerc.conf.
 
 	Default: true
 
+*spinner*
+	Animation shown while loading, split by spinner-delimiter (below)
+
+	Examples:
+	- spinner = "\-\_-,\_-\_"
+	- spinner = '. , .'
+	- spinner = "\,|,/,-"
+
+	Default: "[..]    , [..]   ,  [..]  ,   [..] ,    [..],   [..] ,  [..]  , [..]   "
+
+*spinner-delimiter*
+	Spinner delimiter to split string into a animation
+
+	Default: ","
+
 ## VIEWER
 
 These options are configured in the *[viewer]* section of aerc.conf.

widgets/dirlist.go

@@ -33,7 +33,7 @@ func NewDirectoryList(acctConf *config.AccountConfig, uiConf *config.UIConfig,
 		acctConf: acctConf,
 		uiConf:   uiConf,
 		logger:   logger,
-		spinner:  NewSpinner(),
+		spinner:  NewSpinner(uiConf),
 		store:    lib.NewDirStore(),
 		worker:   worker,
 	}

widgets/msglist.go

@@ -59,7 +59,7 @@ func NewMessageList(conf *config.AercConfig, logger *log.Logger) *MessageList {
 	ml := &MessageList{
 		conf:          conf,
 		logger:        logger,
-		spinner:       NewSpinner(),
+		spinner:       NewSpinner(&conf.Ui),
 		isInitalizing: true,
 	}
 	ml.spinner.OnInvalidate(func(_ ui.Drawable) {

widgets/spinner.go

@@ -3,35 +3,26 @@ package widgets
 import (
 	"sync/atomic"
 	"time"
+	"strings"
 
 	"github.com/gdamore/tcell"
 
+	"git.sr.ht/~sircmpwn/aerc/config"
 	"git.sr.ht/~sircmpwn/aerc/lib/ui"
 )
 
-var (
-	frames = []string{
-		"[..]    ",
-		" [..]   ",
-		"  [..]  ",
-		"   [..] ",
-		"    [..]",
-		"   [..] ",
-		"  [..]  ",
-		" [..]   ",
-	}
-)
-
 type Spinner struct {
 	ui.Invalidatable
 	frame int64 // access via atomic
+	frames []string
 	stop  chan struct{}
 }
 
-func NewSpinner() *Spinner {
+func NewSpinner(uiConf *config.UIConfig) *Spinner {
 	spinner := Spinner{
 		stop:   make(chan struct{}),
 		frame:  -1,
+		frames: strings.Split(uiConf.Spinner, uiConf.SpinnerDelimiter),
 	}
 	return &spinner
 }
@@ -77,11 +68,11 @@ func (s *Spinner) Draw(ctx *ui.Context) {
 		s.Start()
 	}
 
-	cur := int(atomic.LoadInt64(&s.frame) % int64(len(frames)))
+	cur := int(atomic.LoadInt64(&s.frame) % int64(len(s.frames)))
 
 	ctx.Fill(0, 0, ctx.Width(), ctx.Height(), ' ', tcell.StyleDefault)
-	col := ctx.Width()/2 - len(frames[0])/2 + 1
+	col := ctx.Width()/2 - len(s.frames[0])/2 + 1
-	ctx.Printf(col, 0, tcell.StyleDefault, "%s", frames[cur])
+	ctx.Printf(col, 0, tcell.StyleDefault, "%s", s.frames[cur])
 }
 
 func (s *Spinner) Invalidate() {