Periodic autorefresh of buffer visualization

[tom-adsfund]

In my window manager, i3, the shape of the terminal changes over time, and so if I return to Liquid, it's all jumbled up. Can we just have a running autorefresh, or something similar?

[mogenslund]

I will give it at shot more, soon. As far as I remember it can be difficult to get information about the dimensions of the terminal on runtime. But I will give it another try :-)

[tom-adsfund]

Wouldn't it be easiest to do a periodic refresh whatever happens? Maybe add a toggle to stop it if someone finds there's an issue?

[mogenslund]

Pressing ESC twice usually redraws everything, but it does not take into account, if the terminal has be resized. I will have to recalculate the size of each window. I think periodic refreshes will be a bit annoying since the user will experience a slight flicker when nothing is happening. But if I manage to create a good resize function, it should be possible to make a toggle on the periodic refresh.

[tom-adsfund]

stty size gives the terminal size. Which you're actually using already in tty_output.cljc.

SIGWINCH process signal tells when the terminal has been resized. But Java only has a non-standard mechanism to get it:

; Nice GPT4o solution:
; (:import [sun.misc Signal SignalHandler])

(defn handle-sigwinch [ch]
  (reify SignalHandler
    (handle [_ signal]
      (let [[rows cols] (get-terminal-size)]
        (put! ch {:rows rows :cols cols})))))

(defn redraw-editor [rows cols]
  (println (str "Terminal resized to " rows " rows and " cols " columns")))

(defn main-loop []
  (let [sigwinch-chan (chan)]
    (Signal/handle (Signal. "WINCH") (handle-sigwinch sigwinch-chan))
    (go-loop []
      (let [{:keys [rows cols]} (<! sigwinch-chan)]
        (redraw-editor rows cols)
        (recur)))))

But you can at least hook in stty size to the ESC ESC, and maybe put on a toggleable timer.

[tom-adsfund]

Also:

; (:require [clojure.java.shell :refer [sh]]
(defn get-terminal-size []
  (let [size (sh "stty" "size")]
    (mapv #(Integer/parseInt %) (re-seq #"\d+" (:out size)))))