From add1dd8c31708a79cd47fa86f6bc864445272c85 Mon Sep 17 00:00:00 2001
From: Productive2 <48047721+Productive2@users.noreply.github.com>
Date: Wed, 24 Feb 2021 00:31:58 +0100
Subject: [PATCH] terminal resize awareness

---
 examples/editor.nim               |  2 ++
 src/jale/editor.nim               |  9 +++++++--
 src/jale/plugin/defaults.nim      |  3 ++-
 src/jale/plugin/resize.nim        | 17 +++++++++++++++++
 src/jale/plugin/viewprotector.nim | 27 +++++++++++++++++++++++++++
 5 files changed, 55 insertions(+), 3 deletions(-)
 create mode 100644 src/jale/plugin/resize.nim
 create mode 100644 src/jale/plugin/viewprotector.nim

diff --git a/examples/editor.nim b/examples/editor.nim
index a4fd24a..77efff6 100644
--- a/examples/editor.nim
+++ b/examples/editor.nim
@@ -1,4 +1,5 @@
 import jale/plugin/defaults
+import jale/plugin/viewprotector
 import jale/editor
 import jale/templates
 import jale/multiline
@@ -22,6 +23,7 @@ e.bindKey("ctrl+s"):
 
 e.prompt = ""
 e.populateDefaults(enterSubmits = false, ctrlForVerticalMove = false)
+e.setViewBehavior(vbFullscreen)
 e.scrollMode = sbAllScroll
 let result = e.read()
 if save and paramCount() > 0:
diff --git a/src/jale/editor.nim b/src/jale/editor.nim
index 0dbf447..fb4deb5 100644
--- a/src/jale/editor.nim
+++ b/src/jale/editor.nim
@@ -12,7 +12,8 @@ import os
 
 type 
   JaleEvent* = enum
-    jeKeypress, jeQuit, jeFinish, jePreRead, jePostRead
+    jeKeypress, jeQuit, jeFinish, jePreRead, jePostRead, jePreFullRender,
+    jePreKey, jePostKey, jeResize
 
   EditorState = enum
     esOutside, esTyping, esFinishing, esQuitting
@@ -37,7 +38,7 @@ type
     rendered: int # how many lines were printed last full refresh
     forceRedraw: bool
     hscroll: int
-    vmax: int
+    vmax*: int
     vscroll: int
 
 # getter/setter sorts
@@ -108,6 +109,8 @@ proc fullRender(editor: LineEditor) =
   # from the top cursor pos, it draws the entire multiline prompt, then
   # moves cursor to current y
 
+  editor.events.call(jePreFullRender)
+
   let lastY = min(editor.content.high(), editor.vscroll + editor.vmax - 1)
   for i in countup(editor.vscroll, lastY):
     editor.render(i)
@@ -156,7 +159,9 @@ proc read*(editor: LineEditor): string =
     # call the events
     editor.lastKeystroke = key
     editor.keystrokes.call(key)
+    editor.events.call(jePreKey)
     editor.events.call(jeKeypress)
+    editor.events.call(jePostKey)
     # autoscroll horizontally based on current scroll and x pos
     
     # last x rendered
diff --git a/src/jale/plugin/defaults.nim b/src/jale/plugin/defaults.nim
index 7c37435..81375e5 100644
--- a/src/jale/plugin/defaults.nim
+++ b/src/jale/plugin/defaults.nim
@@ -3,6 +3,7 @@ import ../keycodes
 import ../multiline
 import ../event
 import ../templates
+import resize
 
 import tables
 
@@ -20,10 +21,10 @@ proc bindTerminate*(editor: LineEditor) =
     if editor.content.getContent() == "":
       editor.quit()
 
-
 proc populateDefaults*(editor: LineEditor, enterSubmits = true, ctrlForVerticalMove = true) =
   editor.bindInput()
   editor.bindTerminate()
+  editor.bindResize()
   editor.bindKey("left"):
     editor.content.left()
   editor.bindKey("right"):
diff --git a/src/jale/plugin/resize.nim b/src/jale/plugin/resize.nim
new file mode 100644
index 0000000..b80fee9
--- /dev/null
+++ b/src/jale/plugin/resize.nim
@@ -0,0 +1,17 @@
+# only works on posix (through handling SIGWINCH signals)
+
+import ../editor
+import ../event
+
+when defined(posix):
+  import posix
+
+var editors: seq[LineEditor]
+
+proc bindResize*(ed: LineEditor) =
+  editors.add(ed)
+
+when defined(posix):
+  onSignal(28):
+    for ed in editors:
+      ed.events.call(jeResize)
diff --git a/src/jale/plugin/viewprotector.nim b/src/jale/plugin/viewprotector.nim
new file mode 100644
index 0000000..320d174
--- /dev/null
+++ b/src/jale/plugin/viewprotector.nim
@@ -0,0 +1,27 @@
+import ../editor
+import ../templates
+
+import terminal
+
+type ViewBehavior* = enum
+  vbLines, vbLinesLimited, vbFullscreen
+
+proc setViewBehavior*(ed: LineEditor, behavior: ViewBehavior) =
+  case behavior:
+    of vbLines:
+      ed.bindEvent(jeResize):
+        ed.vmax = terminalHeight() - 1
+    of vbLinesLimited:
+      discard
+    of vbFullscreen:
+      var resized = false
+      ed.bindEvent(jeResize):
+        ed.vmax = terminalHeight() - 1
+        ed.redraw()
+        resized = true
+      ed.bindEvent(jePreFullRender):
+        if resized:
+          eraseScreen()
+          setCursorPos(0,0)
+          resized = false
+