From 24daef89e0fc6056c3ff7b94880ed12b4ec3eaa6 Mon Sep 17 00:00:00 2001
From: Drew DeVault <sir@cmpwn.com>
Date: Thu, 14 Mar 2019 23:41:25 -0400
Subject: Implement :{next,prev}-message

---
 commands/next-folder.go  |  6 +++---
 commands/next-message.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 widgets/account.go       |  4 ++++
 widgets/msglist.go       | 20 ++++++++++++++++++++
 4 files changed, 70 insertions(+), 3 deletions(-)
 create mode 100644 commands/next-message.go

diff --git a/commands/next-folder.go b/commands/next-folder.go
index ed11615..dce8907 100644
--- a/commands/next-folder.go
+++ b/commands/next-folder.go
@@ -13,13 +13,13 @@ func init() {
 	Register("prev-folder", NextPrevFolder)
 }
 
-func usage(cmd string) error {
+func nextPrevFolderUsage(cmd string) error {
 	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
 }
 
 func NextPrevFolder(aerc *widgets.Aerc, args []string) error {
 	if len(args) > 2 {
-		return usage(args[0])
+		return nextPrevFolderUsage(args[0])
 	}
 	var (
 		n   int = 1
@@ -28,7 +28,7 @@ func NextPrevFolder(aerc *widgets.Aerc, args []string) error {
 	if len(args) > 1 {
 		n, err = strconv.Atoi(args[1])
 		if err != nil {
-			return usage(args[0])
+			return nextPrevFolderUsage(args[0])
 		}
 	}
 	acct := aerc.SelectedAccount()
diff --git a/commands/next-message.go b/commands/next-message.go
new file mode 100644
index 0000000..86cd678
--- /dev/null
+++ b/commands/next-message.go
@@ -0,0 +1,43 @@
+package commands
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+
+	"git.sr.ht/~sircmpwn/aerc2/widgets"
+)
+
+func init() {
+	Register("next-message", NextPrevMessage)
+	Register("prev-message", NextPrevMessage)
+}
+
+func nextPrevMessageUsage(cmd string) error {
+	return errors.New(fmt.Sprintf("Usage: %s [n]", cmd))
+}
+
+func NextPrevMessage(aerc *widgets.Aerc, args []string) error {
+	if len(args) > 2 {
+		return nextPrevMessageUsage(args[0])
+	}
+	var (
+		n   int = 1
+		err error
+	)
+	if len(args) > 1 {
+		n, err = strconv.Atoi(args[1])
+		if err != nil {
+			return nextPrevMessageUsage(args[0])
+		}
+	}
+	acct := aerc.SelectedAccount()
+	for ; n > 0; n-- {
+		if args[0] == "prev-message" {
+			acct.Messages().Prev()
+		} else {
+			acct.Messages().Next()
+		}
+	}
+	return nil
+}
diff --git a/widgets/account.go b/widgets/account.go
index 82d2cad..f5e24d2 100644
--- a/widgets/account.go
+++ b/widgets/account.go
@@ -172,6 +172,10 @@ func (acct *AccountView) Directories() *DirectoryList {
 	return acct.dirlist
 }
 
+func (acct *AccountView) Messages() *MessageList {
+	return acct.msglist
+}
+
 func (acct *AccountView) onMessage(msg types.WorkerMessage) {
 	switch msg := msg.(type) {
 	case *types.Done:
diff --git a/widgets/msglist.go b/widgets/msglist.go
index e004e0e..36d7f7a 100644
--- a/widgets/msglist.go
+++ b/widgets/msglist.go
@@ -180,3 +180,23 @@ func (ml *MessageList) SetStore(store *MessageStore) {
 	}
 	ml.Invalidate()
 }
+
+func (ml *MessageList) nextPrev(delta int) {
+	ml.selected += delta
+	if ml.selected < 0 {
+		ml.selected = len(ml.store.Uids) - 1
+	}
+	if ml.selected >= len(ml.store.Uids) {
+		ml.selected = 0
+	}
+	// TODO: scrolling
+	ml.Invalidate()
+}
+
+func (ml *MessageList) Next() {
+	ml.nextPrev(1)
+}
+
+func (ml *MessageList) Prev() {
+	ml.nextPrev(-1)
+}
-- 
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