[dev] experimenting with ii, question about a script

From: Greg Reagle <greg.reagle_AT_umbc.edu>
Date: Sat, 22 Feb 2020 10:51:01 -0500

I am new to ii and experimenting and learning. I had the thought, "Why re-invent the wheel?" Questions and comments are welcome. I am sharing my thoughts.

For a little program that deals with an in and an out file, like lchat or xii [1], I need only three features: an out-displayer, an in-sender, and a combiner. These tools already exist, so no need to write a new GUI or curses TUI etc.

For the out-displayer, I want these features: scrolling to see all output, select and copy, notification when out grows. For the in-sender: edit text and send text to in file. For the combiner: make the out-displayer real big and put the in-sender real small below it.

For the out-displayer, use "tail -n +0 -f out" in a dvtm window and I get all the features except notification.
For the in-sender, use "nano -nw in" in a dvtm window. Of course you could choose a different editor. For the combiner I use dvtm. It allows me to combine the two components, set their relative size and position. It also provides scrolling and access to the scrollback buffer, and select and copy and paste.

So here is the script. Note that my-dvtm is just an extremely simple shell script that sets a few options that I prefer (e.g. bigger scrollback buffer). I could not figure out how to make this script work without calling a new terminal window (st). If I put dvtm into the background (calling dvtm directly without st) I get all sorts of problems. Is it possible? Any other improvements could be made to this script?

set -u
[ -d "$1" -a -r "$1"/out -a -p "$1"/in ] || exit 1
cmd_fifo=$(mktemp -u) || exit 1
mkfifo "$cmd_fifo" || exit 1
st -e my-dvtm -c "$cmd_fifo" "nano -nw \"$1/in\"" "tail -n +0 -f \"$1\"/out" &

d="0.09" # dvtm crashes without pausing at leat 0.07 seconds
# I had to customize dvtm to allow these commands to the command fifo, and it
# was very easy to do so. They are based on the keyboard commands.
        for cmd in b j l l l l l l; do
                sleep "$d"
                echo "$cmd"
} >"$cmd_fifo"

[1] https://tools.suckless.org/ii/usage/
Received on Sat Feb 22 2020 - 16:51:01 CET

This archive was generated by hypermail 2.3.0 : Sat Feb 22 2020 - 17:48:08 CET