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#/bin/sh
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# File: set-x11vnc-resolution.sh
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# Location: /mnt/public/Support/Programs/vnc/
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# Author: bgstack15
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# Startdate: 2024-08-15-5 13:09
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# SPDX-License-Identifier: GPL-3.0-only
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# Title: Resize x11vnc server in a vnc client window
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# Purpose: Simplify resizing remmina vnc window
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# History:
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# Usage: run on client side
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# Reference:
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# https://unix.stackexchange.com/questions/14159/how-do-i-find-the-window-dimensions-and-position-accurately-including-decoration/14170#14170
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# https://stackoverflow.com/questions/15816/changing-the-resolution-of-a-vnc-session-in-linux
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# https://stackoverflow.com/questions/2683279/how-to-detect-if-a-script-is-being-sourced
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# Improve:
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# This does not handle any other wm than fluxbox, or client other than remmina
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# Dependencies:
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# client: kerberos ticket for ssh to x11vnc server, xwininfo, xdotool,
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# server: /mnt/public/Support/Platforms/devuan/scripts/enable-remote-desktop.sh, xrandr, cvt, fbsetbg
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# Documentation:
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# For consistent dpi across custom resolutions, use /etc/X11/Xresources/vnc-dpi contents `Xft.dpi: 96`
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_get_geometry() {
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#_id="${_id:-"$( xdotool getactivewindow )"}"
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_id="${_id:-${1}}"
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test -z "${_id}" && return 1
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unset x y w h
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eval $( xwininfo -id "${_id}" | \
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sed -n -e "s/^ \+Absolute upper-left X: \+\([0-9]\+\).*/x=\1/p" \
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-e "s/^ \+Absolute upper-left Y: \+\([0-9]\+\).*/y=\1/p" \
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-e "s/^ \+Width: \+\([0-9]\+\).*/w=\1/p" \
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-e "s/^ \+Height: \+\([0-9]\+\).*/h=\1/p" )
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#printf '%s\n' "${x} ${y} ${w} ${h}"
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# my fluxbox theme uses 35,47 offset to the first pixel of the x11 server in remmina
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# 38, 32
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# I think these numbers cannot get precise. 45 is fairly close and seems to avoid scrollbars.
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echo "_w=$(( w - 45 ))"
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echo "_h=$(( h - 45 ))"
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}
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_get_important_window() {
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# You might be tempted to let the user click a window, however, it would be painful to guarantee you can learn the correct target host. The titlebar might have the vncserver name, or not. We should just make vncserver required.
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# FUTUREIMPROVEMENT
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# I only use remmina but that might change.
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# return window id
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xwininfo -root -tree | awk "\$0 ~ /${vncserver}/ && /remmina/ && "'!'"/awk/ {print \$1}"
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}
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_connect_and_add_resolution() {
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# we know we always run x11vnc from script /mnt/public/Support/Platforms/devuan/enable-remote-desktop.sh
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# which uses env vars XAUTHORITY=/tmp/:0 DISPLAY=:0
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# but let us parse in case that ever changes.
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# this ssh depends on kerberos or other passwordless operation
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ssh "${vncserver}" /bin/sh ${VERBOSE:+-x} <<-EOF
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_i="\$( ps -e -o command:180 | grep -E '[x]11vnc' )"
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export XAUTHORITY="\$( echo "\${_i}" | xargs -n1 | awk '/-auth/{getline;print;}' )"
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export DISPLAY="\$( echo "\${_i}" | xargs -n1 | awk '/-display/{getline;print;}' )"
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#xrandr | awk "/${_w}x${_h}/" | grep -qE . && exit 0
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_connected="\$( xrandr | awk '/ connected/{print \$1}' )"
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export _newmode="\$( cvt "${_w}" "${_h}" | awk '{\$1="";print}' | tr -d '"' | tail -n1 )"
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export _newmodename="\$( echo "\${_newmode}" | awk '{print \$1}' )"
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xrandr --newmode \${_newmode} 2>&1 | grep -vE 'of failed request|Current serial number' | grep -e '.'
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xrandr --addmode "\${_connected}" \${_newmodename}
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xrandr -s \${_newmodename}
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# common wallpaper command for stackrpms
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fbsetbg -a /etc/wallpaper
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EOF
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# thankfully the XAUTHORITY and DISPLAY lets us run fbsetbg, so we do not need this.
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# get user of root. thankfully we always use fluxbox.
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#_u="\$( ps -ef | awk '\$NF~/[f]luxbox/{print \$1}' )"
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}
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# BEGIN IF-DOT-SOURCED
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sourced=0
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if [ -n "$ZSH_VERSION" ]; then
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case $ZSH_EVAL_CONTEXT in *:file) sourced=1;; esac
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elif [ -n "$KSH_VERSION" ]; then
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[ "$(cd -- "$(dirname -- "$0")" && pwd -P)/$(basename -- "$0")" != "$(cd -- "$(dirname -- "${.sh.file}")" && pwd -P)/$(basename -- "${.sh.file}")" ] && sourced=1
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elif [ -n "$BASH_VERSION" ]; then
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(return 0 2>/dev/null) && sourced=1
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else # All other shells: examine $0 for known shell binary filenames.
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# Detects `sh` and `dash`; add additional shell filenames as needed.
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case ${0##*/} in sh|-sh|dash|-dash) sourced=1;; esac
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fi
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# END IF-DOT-SOURCED
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# MAIN
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if test "${sourced}" = "0" ;
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then
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vncserver="${vncserver:-${1}}"
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test -z "${vncserver}" && { echo "Fatal! Set vncserver to run ${0}. Aborted." 1>&2 ; return 1 ; }
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_id="$( _get_important_window )"
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eval $( _get_geometry "${_id}" )
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echo "working with w=${_w}, h=${_h}"
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_connect_and_add_resolution
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fi
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