Rodrigo Martins wrote in <zurdtxkd39tka...@firemail.cc>: |It was thus said that the Great Greg Reagle once stated: |> I have coined the phrase terminal transformer for a class of programs |> like tmux, dvtm, tcvt, and splitvt. Perhaps there is already a phrase. |> A terminal transformer runs on top of a terminal emulator and acts as |> a terminal emulator itself, with an application like nano running on |> top of it. In other words, it uses a terminal emulator and is used |> as a terminal emulator. |> |> I would like to experiment with a completely transparent transformer as |> a starting point. A transparent transformer passes through everything. |> Ideally it does nothing. Just as a--not useful--example, if I want |> hitting the left cursor key to move the cursor left then right then left |> again, I can add code to intercept that escape sequence and program it |> to do that. That is how I imagine experimenting with more sophisticated |> and useful transformations. |> |> I would like some guidance on developing a program that is a transparent |> terminal transformer in a way that is as simple and stupid as possible.
dtach. #?0|kent:dwm.git$ prt-get info dtach Name: dtach Version: 0.9 Release: 3 Description: Emulates the detach feature of screen. URL: https://github.com/crigler/dtach #?0|kent:dwm.git$ ldd /usr/bin/dtach linux-vdso.so.1 (0x00007fffe5b62000) libc.so.6 => /lib/libc.so.6 (0x00007f23accfd000) /lib/ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 (0x00007f23acef6000) I use it on the (v)server to drive the IRC proxy: mkfifo -m 0666 ${rundir}/root/linger_control cat > ${rundir}/root/init <<_EOT #!/bin/sh - [ -n "${BUSYBOX}" ] && /bin/mount -n -t proc -o nosuid,nodev,noexec proc /proc if [ -n "${SUPER_IS_DOAS}" ]; then arg1="-u ${boxuser}" arg2= else arg1='-p -c' arg2=${boxuser} fi exec ${SUPER} \${arg1} sh -c ' dtach -n /tmp/.${boxuser}-irssi ${irssi} read x < /linger_control pkill -TERM ${irssi} sleep 1 pgrep ${irssi} && pkill -KILL ${irssi} echo done > /linger_control ' \${arg2} _EOT Ie this runs "boxed": ip netns exec ${netns} \ /usr/bin/env -i TERM=${TERM} \ /usr/bin/unshare --ipc --uts --pid --fork --mount --mount-proc \ ${kill_child} ${rooter} /init </dev/null >/dev/null 2>&1 & pid=${!} [ -d /sys/fs/cgroup/_box_ircproxy ] && printf '%s\n' ${pid} > /sys/fs/cgroup/_box_ircproxy/cgroup.procs It is pretty cool in that i usually access this proxy from my laptop's irssi and have IRC as one would expect, but i can also ssh into the box and then enter the irssi running via dtach via dtach. (This is good because the local irssi does not see anything the "real irssi" aka the proxy sees. Anyhow, dtach is super old and super stable and i thankfully think of the Japanese user (who, one could believe, also listens here) who mentions this program to me. Last commit in 2017 (https://github.com/crigler/dtach.git). --steffen | |Der Kragenbaer, The moon bear, |der holt sich munter he cheerfully and one by one |einen nach dem anderen runter wa.ks himself off |(By Robert Gernhardt)
