1 files changed, 180 insertions, 0 deletions
diff --git a/src/twtio.nim b/src/twtio.nim
new file mode 100644
index 00000000..0fdbed7c
--- /dev/null
+++ b/src/twtio.nim
@@ -0,0 +1,180 @@
+import terminal
+import tables
+import unicode
+
+import twtstr
+import config
+import radixtree
+
+template print*(s: varargs[string, `$`]) =
+  for x in s:
+    stdout.write(x)
+
+template printesc*(s: string) =
+  for r in s.runes:
+    if r.isControlChar():
+      stdout.write(('^' & $($r)[0].getControlLetter())
+                   .ansiFgColor(fgBlue).ansiStyle(styleBright).ansiReset())
+    else:
+      stdout.write($r)
+
+template eprint*(s: varargs[string, `$`]) = {.cast(noSideEffect).}:
+  var a = false
+  for x in s:
+    if not a:
+      a = true
+    else:
+      stderr.write(' ')
+    stderr.write(x)
+  stderr.write('\n')
+
+proc termGoto*(x: int, y: int) =
+  setCursorPos(stdout, x, y)
+
+proc getNormalAction*(s: string): TwtAction =
+  if normalActionRemap.hasKey(s):
+    return normalActionRemap[s]
+  return NO_ACTION
+
+proc getLinedAction*(s: string): TwtAction =
+  if linedActionRemap.hasKey(s):
+    return linedActionRemap[s]
+  return NO_ACTION
+
+proc readLine*(prompt: string, current: var string, termwidth: int): bool =
+  var news = current.toRunes()
+  let maxlen = termwidth - prompt.len
+  var s = ""
+  var feedNext = false
+  var escNext = false
+  var comp = false
+  var compi = 0
+  var compa = 0
+  var comps = ""
+  var cursor = news.len
+  var shift = 0
+  while true:
+    let rl = news.len
+    if cursor < shift:
+      shift = max(cursor - 1, 0)
+    else:
+      while news.substr(shift, shift + cursor).width() > maxlen - 1:
+        shift += news[^1].width()
+
+    eraseLine()
+    printesc(prompt & $news.substr(shift, shift + maxlen - 1))
+
+    print('\r')
+    cursorForward(prompt.len + news.substr(shift, cursor).width())
+
+    if not feedNext:
+      s = ""
+    else:
+      feedNext = false
+    let c = getch()
+    s &= c
+    var action = getLinedAction(s)
+    if escNext:
+      action = NO_ACTION
+    case action
+    of ACTION_LINED_CANCEL:
+      return false
+    of ACTION_LINED_SUBMIT:
+      current = $news
+      return true
+    of ACTION_LINED_BACKSPACE:
+      if cursor > 0:
+        news = news.substr(0, cursor - 1) & news.substr(cursor)
+        dec cursor
+    of ACTION_LINED_DELETE:
+      if cursor > 0 and cursor < rl:
+        news = news.substr(0, cursor) & news.substr(cursor + 1)
+    of ACTION_LINED_ESC:
+      escNext = true
+    of ACTION_LINED_CLEAR:
+      news = news.substr(cursor)
+      cursor = 0
+    of ACTION_LINED_KILL:
+      news = news.substr(0, cursor)
+    of ACTION_LINED_BACK:
+      if cursor > 0:
+        dec cursor
+    of ACTION_LINED_FORWARD:
+      if cursor < rl:
+        inc cursor
+    of ACTION_LINED_PREV_WORD:
+      while cursor > 0:
+        dec cursor
+        if news[cursor].breaksWord():
+          break
+    of ACTION_LINED_NEXT_WORD:
+      while cursor < rl:
+        inc cursor
+        if cursor < rl:
+          if news[cursor].breaksWord():
+            break
+    of ACTION_LINED_KILL_WORD:
+      var chars = 0
+      while cursor > chars:
+        inc chars
+        if news[cursor - chars].breaksWord():
+          break
+      if chars > 0:
+        news = news.substr(0, cursor - chars) & news.substr(cursor)
+        cursor -= chars
+    of ACTION_LINED_COMPOSE_ON:
+      comp = true
+      compi = 0
+      compa = 0
+      comps = ""
+    of ACTION_LINED_COMPOSE_OFF:
+      comp = false
+      compi = 0
+      compa = 0
+      comps = ""
+    of ACTION_LINED_COMPOSE_TOGGLE:
+      comp = not comp
+      compi = 0
+      compa = 0
+      comps = ""
+    of ACTION_FEED_NEXT:
+      feedNext = true
+    elif comp:
+      comps &= c
+      let n = composeRemap[comps, compi]
+      if n != compi:
+        compi = n
+        compa += comps.len
+        comps = ""
+      if composeRemap.hasPrefix(comps, compi) and composeRemap.nodes[n].children.len > 0:
+        feedNext = true
+      else:
+        var cs = ""
+        if composeRemap.nodes[compi].leaf:
+          cs = composeRemap.nodes[compi].value
+        else:
+          cs = s.substr(0, compa - 1)
+        comps = s.substr(compa)
+        if not composeRemap.hasPrefix(comps, 0):
+          cs &= comps
+          comps = ""
+
+        news = news.substr(0, cursor) & cs.toRunes() & news.substr(cursor)
+        cursor += cs.runeLen()
+        compi = 0
+        compa = 0
+    elif validateUtf8(s) == -1:
+      var cs = ""
+      for c in s:
+        if not c.isControlChar():
+          cs &= c
+        elif escNext:
+          cs &= c
+          escNext = false
+      escNext = false
+      if cs.len == 0:
+        continue
+      news = news.substr(0, cursor) & cs.toRunes() & news.substr(cursor)
+      cursor += cs.runeLen()
+    else:
+      feedNext = true