#!/bin/bash

set -e

cleanup() {
    rm -r "$TEMPDIR"
}

die() {
    echo "$1" 1>&2
    cleanup
    exit 1
}

DELTA="${1:-./target/release/delta} --no-gitconfig --navigate"

# Trick delta into thinking that its pager is less, when really it is cat.
unset DELTA_PAGER
TEMPDIR="$(mktemp -d)"
export PAGER="$TEMPDIR/less"
cat >"$PAGER" <<-EOF
	#!/bin/sh
	cat
EOF
chmod 755 $PAGER

test_delta_less_hist_file_created () {
    DELTA_HIST_FILE="${XDG_DATA_HOME:-$HOME/.local/share}/delta/lesshst"
    rm -f ~/.lesshst "$DELTA_HIST_FILE"
    [ -e "$DELTA_HIST_FILE" ] && die "Expected \"$DELTA_HIST_FILE\" not to exist"
    if [[ "$OSTYPE" = darwin* ]]; then
        # Trick git and delta into invoking their pager child processes, despite
        # output not being a tty.
        script -q /dev/null git -c pager.log="$DELTA" log -p HEAD~2...HEAD > /dev/null
    else
        git -c pager.log="$DELTA" log -p HEAD~2...HEAD
    fi
    [ -e "$DELTA_HIST_FILE" ] || die "Expected \"$DELTA_HIST_FILE\" to exist"
}

# Basic test
test_delta_less_hist_file_created

# Test it works with a custom LESSHISTFILE
export LESSHISTFILE=$TEMPDIR/delta.lesshst
test_delta_less_hist_file_created

# Test histfile sections other than `.search` at the end of the file (#1)
cat >$LESSHISTFILE <<-EOF
	.shell
	"pwd
	"ls -Al ../data/
EOF
test_delta_less_hist_file_created

# Test histfile sections other than `.search` at the end of the file (#2)
cat >>$LESSHISTFILE <<-EOF
	.mark
	m a 1 7740 /etc/gitconfig
	m b 1 4221 /etc/profile
EOF
test_delta_less_hist_file_created

# Cleanup
cleanup