1 files changed, 52 insertions, 0 deletions
diff --git a/src/io/window.nim b/src/io/window.nim
new file mode 100644
index 00000000..95da9e70
--- /dev/null
+++ b/src/io/window.nim
@@ -0,0 +1,52 @@
+import terminal
+
+when defined(posix):
+  import termios
+
+
+type
+  WindowAttributes* = object
+    width*: int
+    height*: int
+    ppc*: int # cell width
+    ppl*: int # cell height
+    cell_ratio*: float64 # ppl / ppc
+    width_px*: int
+    height_px*: int
+
+proc getWindowAttributes*(tty: File): WindowAttributes =
+  if tty.isatty():
+    when defined(posix):
+      var win: IOctl_WinSize
+      if ioctl(cint(getOsFileHandle(tty)), TIOCGWINSZ, addr win) != -1:
+        var cols = win.ws_col
+        var rows = win.ws_row
+        if cols == 0:
+          cols = 80
+        if rows == 0:
+          rows = 24
+        # some terminals don't like it when we fill the last cell. #TODO make this optional
+        result.width = int(cols) - 1
+        result.height = int(rows)
+        result.ppc = int(win.ws_xpixel) div result.width
+        result.ppl = int(win.ws_ypixel) div result.height
+        # some terminal emulators (aka vte) don't set ws_xpixel or ws_ypixel.
+        # solution: use xterm.
+        if result.ppc == 0:
+          result.ppc = 9
+        if result.ppl == 0:
+          result.ppl = 18
+        result.width_px = result.width * result.ppc
+        result.height_px = result.height * result.ppl
+        result.cell_ratio = result.ppl / result.ppc
+        return
+  #fail
+  result.width = terminalWidth() - 1
+  result.height = terminalHeight()
+  if result.height == 0:
+    result.height = 24
+  result.ppc = 9
+  result.ppl = 18
+  result.cell_ratio = result.ppl / result.ppc
+  result.width_px = result.ppc * result.width
+  result.height_px = result.ppl * result.height