Contextual UI Configuration

+ Adds parsing of contextual ui sections to aerc config.
+ Add GetUiConfig method for AercConfig that is used to get the
  specialized UI config.
+ Add UiConfig method to AccountView to get specialized UI Config.
+ Modifies Aerc codebase to use specialized UIConfig instead.
+ Adds documentation for Contextual UI Configuration

3 files changed, 27 insertions, 10 deletions

diff --git a/widgets/account.go b/widgets/account.go
index 404a9ea..66320a3 100644
--- a/widgets/account.go
+++ b/widgets/account.go
@@ -31,13 +31,24 @@ type AccountView struct {
 	worker  *types.Worker
 }
 
+func (acct *AccountView) UiConfig() config.UIConfig {
+	return acct.conf.GetUiConfig(map[int]string{
+		config.UI_CONTEXT_ACCOUNT: acct.AccountConfig().Name,
+		config.UI_CONTEXT_FOLDER:  acct.Directories().Selected(),
+	})
+}
+
 func NewAccountView(aerc *Aerc, conf *config.AercConfig, acct *config.AccountConfig,
 	logger *log.Logger, host TabHost) *AccountView {
 
+	acctUiConf := conf.GetUiConfig(map[int]string{
+		config.UI_CONTEXT_ACCOUNT: acct.Name,
+	})
+
 	grid := ui.NewGrid().Rows([]ui.GridSpec{
 		{ui.SIZE_WEIGHT, 1},
 	}).Columns([]ui.GridSpec{
-		{ui.SIZE_EXACT, conf.Ui.SidebarWidth},
+		{ui.SIZE_EXACT, acctUiConf.SidebarWidth},
 		{ui.SIZE_WEIGHT, 1},
 	})
 
@@ -54,8 +65,8 @@ func NewAccountView(aerc *Aerc, conf *config.AercConfig, acct *config.AccountCon
 		}
 	}
 
-	dirlist := NewDirectoryList(acct, &conf.Ui, logger, worker)
-	if conf.Ui.SidebarWidth > 0 {
+	dirlist := NewDirectoryList(acct, &acctUiConf, logger, worker)
+	if acctUiConf.SidebarWidth > 0 {
 		grid.AddChild(ui.NewBordered(dirlist, ui.BORDER_RIGHT))
 	}
 
@@ -236,7 +247,7 @@ func (acct *AccountView) onMessage(msg types.WorkerMessage) {
 					acct.conf.Triggers.ExecNewEmail(acct.acct,
 						acct.conf, msg)
 				}, func() {
-					if acct.conf.Ui.NewMessageBell {
+					if acct.UiConfig().NewMessageBell {
 						acct.host.Beep()
 					}
 				})
@@ -272,10 +283,10 @@ func (acct *AccountView) onMessage(msg types.WorkerMessage) {
 }
 
 func (acct *AccountView) getSortCriteria() []*types.SortCriterion {
-	if len(acct.conf.Ui.Sort) == 0 {
+	if len(acct.UiConfig().Sort) == 0 {
 		return nil
 	}
-	criteria, err := sort.GetSortCriteria(acct.conf.Ui.Sort)
+	criteria, err := sort.GetSortCriteria(acct.UiConfig().Sort)
 	if err != nil {
 		acct.aerc.PushError(" ui.sort: " + err.Error())
 		return nil
diff --git a/widgets/msglist.go b/widgets/msglist.go
index 243c5db..24a9940 100644
--- a/widgets/msglist.go
+++ b/widgets/msglist.go
@@ -106,10 +106,16 @@ func (ml *MessageList) Draw(ctx *ui.Context) {
 		}
 
 		ctx.Fill(0, row, ctx.Width(), 1, ' ', style)
+		uiConfig := ml.conf.GetUiConfig(map[int]string{
+			config.UI_CONTEXT_ACCOUNT: ml.aerc.SelectedAccount().AccountConfig().Name,
+			config.UI_CONTEXT_FOLDER:  ml.aerc.SelectedAccount().Directories().Selected(),
+			config.UI_CONTEXT_SUBJECT: msg.Envelope.Subject,
+		})
+
 		fmtStr, args, err := format.ParseMessageFormat(
 			ml.aerc.SelectedAccount().acct.From,
-			ml.conf.Ui.IndexFormat,
-			ml.conf.Ui.TimestampFormat, "", i, msg, store.IsMarked(uid))
+			uiConfig.IndexFormat,
+			uiConfig.TimestampFormat, "", i, msg, store.IsMarked(uid))
 		if err != nil {
 			ctx.Printf(0, row, style, "%v", err)
 		} else {
@@ -265,7 +271,7 @@ func (ml *MessageList) Scroll() {
 }
 
 func (ml *MessageList) drawEmptyMessage(ctx *ui.Context) {
-	msg := ml.conf.Ui.EmptyMessage
+	msg := ml.aerc.SelectedAccount().UiConfig().EmptyMessage
 	ctx.Printf((ctx.Width()/2)-(len(msg)/2), 0,
 		tcell.StyleDefault, "%s", msg)
 }
diff --git a/widgets/msgviewer.go b/widgets/msgviewer.go
index 0bfd2d8..93d3d89 100644
--- a/widgets/msgviewer.go
+++ b/widgets/msgviewer.go
@@ -63,7 +63,7 @@ func NewMessageViewer(acct *AccountView, conf *config.AercConfig,
 		func(header string) ui.Drawable {
 			return &HeaderView{
 				Name:  header,
-				Value: fmtHeader(msg, header, conf.Ui.TimestampFormat),
+				Value: fmtHeader(msg, header, acct.UiConfig().TimestampFormat),
 			}
 		},
 	)