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Thomas De Schampheleire

diff: fix 2-way diff panel height

Since a jQuery upgrade in commit c225c37c069d, 2-way diff was broken: the
height was not correct, and sometimes the source code was shown in gray
boxes.

Analysis showed that in the invocation of mergely
(templates/files/diff_2way.html), '$("#footer").height()' is undefined, in
turn caused by the absence of an HTML element with id 'footer'.

In jQuery 3.0, the height function returns 'undefined' on empty sets, while
it was 'null' in older versions. This is important because in a mathematical
expression, 'null' behaves as the number 0, but 'undefined' causes a NaN
(not-a-number) result.
See: https://jquery.com/upgrade-guide/3.0/#breaking-change-return-values-on-empty-sets-are-undefined

The 'id' property on the footer was removed in commit 61c99cdbbfff,
retaining only the 'class="footer"'.

Fix the problem by using the class-based selector to get the footer height.

As the footer height will now be an actual value instead of '0' originally,
we can update the calculation without 'magic' values like '36' which was
actually a reference to the footer size.
When we initialize mergely, the page only contains the header and footer.
All window space below the footer can be assigned to the compare panes. The
height specified to mergely is thus the total window height minus the header
height (the top position of the footer) and the footer height.

Note: another change in this context is that jQuery 3.0 can now return
non-integer values for .height(), e.g. 138.0345. In the case of 2-way diff,
this is not an actual problem.
See: https://jquery.com/upgrade-guide/3.0/#breaking-change-width-height-css-quot-width-quot-and-css-quot-height-quot-can-return-non-integer-values

#!/bin/bash
###########################################
#### THIS IS AN ARCH LINUX RC.D SCRIPT ####
###########################################

. /etc/rc.conf
. /etc/rc.d/functions

DAEMON=kallithea
APP_HOMEDIR="/srv"
APP_PATH="$APP_HOMEDIR/$DAEMON"
CONF_NAME="production.ini"
LOG_FILE="/var/log/$DAEMON.log"
PID_FILE="/run/daemons/$DAEMON"
APPL=/usr/bin/gearbox
RUN_AS="*****"

ARGS="serve --daemon \
--user=$RUN_AS \
--group=$RUN_AS \
--pid-file=$PID_FILE \
--log-file=$LOG_FILE \
-c $APP_PATH/$CONF_NAME"

[ -r /etc/conf.d/$DAEMON ] && . /etc/conf.d/$DAEMON

if [[ -r $PID_FILE ]]; then
    read -r PID < "$PID_FILE"
    if [[ $PID && ! -d /proc/$PID ]]; then
        unset PID
        rm_daemon $DAEMON
    fi
fi

case "$1" in
start)
    stat_busy "Starting $DAEMON"
    export HOME=$APP_PATH
    [ -z "$PID" ] && $APPL $ARGS &>/dev/null
    if [ $? = 0 ]; then
        add_daemon $DAEMON
        stat_done
    else
        stat_fail
        exit 1
    fi
    ;;
stop)
    stat_busy "Stopping $DAEMON"
    [ -n "$PID" ] && kill $PID &>/dev/null
    if [ $? = 0 ]; then
        rm_daemon $DAEMON
        stat_done
    else
        stat_fail
        exit 1
    fi
    ;;
restart)
    $0 stop
    sleep 1
    $0 start
    ;;
status)
    stat_busy "Checking $name status";
    ck_status $name
    ;;
*)
    echo "usage: $0 {start|stop|restart|status}"
esac