From dbf3ad8414ac528991bbb3b43610a5479b4b356c Mon Sep 17 00:00:00 2001
From: Koushien <Koushien@airmail.cc>
Date: Fri, 5 Jan 2018 21:36:12 -0800
Subject: [PATCH] Support Emacs-style C-(a|e|k|u) in cmdline

By default, C-c in Vimperator copies selection if
present. We reimplement this.
---
 src/commandline_frame.ts | 44 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/src/commandline_frame.ts b/src/commandline_frame.ts
index ae232fcc..c8f21333 100644
--- a/src/commandline_frame.ts
+++ b/src/commandline_frame.ts
@@ -105,11 +105,47 @@ clInput.addEventListener("keydown", function (keyevent) {
             history(1)
             break
 
-        // Clear input on ^C
+        case "a":
+            if (keyevent.ctrlKey) {
+                keyevent.preventDefault()
+                keyevent.stopPropagation()
+                setCursor()
+            }
+            break
+
+        case "e":
+            if (keyevent.ctrlKey){
+                keyevent.preventDefault()
+                keyevent.stopPropagation()
+                setCursor(clInput.value.length)
+            }
+            break
+
+        case "u":
+            if (keyevent.ctrlKey){
+                keyevent.preventDefault()
+                keyevent.stopPropagation()
+                clInput.value = clInput.value.slice(clInput.selectionStart, clInput.value.length)
+                setCursor()
+            }
+            break
+
+        case "k":
+            if (keyevent.ctrlKey){
+                keyevent.preventDefault()
+                keyevent.stopPropagation()
+                clInput.value = clInput.value.slice(0, clInput.selectionStart)
+            }
+            break
+
+        // Clear input on ^C if there is no selection
         // Todo: hard mode: vi style editing on cli, like set -o mode vi
         // should probably just defer to another library
         case "c":
-            if (keyevent.ctrlKey) hide_and_clear()
+            if (keyevent.ctrlKey &&
+                ! clInput.value.substring(clInput.selectionStart, clInput.selectionEnd)) {
+                hide_and_clear()
+            }
             break
 
         case "f":
@@ -173,6 +209,10 @@ async function hide_and_clear(){
     isVisible = false
 }
 
+function setCursor(n = 0) {
+    clInput.setSelectionRange(n, n, "none")
+}
+
 function tabcomplete(){
     let fragment = clInput.value
     let matches = state.cmdHistory.filter((key)=>key.startsWith(fragment))