#! /bin/sh
# tapview - a TAP (Test Anything Protocol) viewer in pure POSIX shell
#
# Copyright by Eric S. Raymond
#
# This code is intended to be embedded in your project. The author
# grants permission for it to be distributed under the prevailing
# license of your project if you choose, provided that license is
# OSD-compliant; otherwise the following SPDX tag applies.
#
# SPDX-License-Identifier: BSD-2-Clause
#
# This is version 1.0
# A newer version may be available at https://gitlab.com/esr/tapview
#
# POSIX allows but does not mandate that -n suppresses emission of a
# trailing newline in echo. Thus, some shell builtin echos don't do
# that.  Cope gracefully.
# shellcheck disable=SC2039
if [ "$(echo -n "a"; echo "b")" != "ab" ]
then
    ECHO="echo"
elif [ "$(/bin/echo -n "a"; /bin/echo "b")" = "ab" ]
then
    ECHO="/bin/echo"
else
    echo "tapview: bailing out, your echo lacks -n support."
    exit 3
fi

OK="."
FAIL="F"
SKIP="s"
TODO_NOT_OK="x"
TODO_OK="u"

ship_char() {
    # shellcheck disable=SC2039
    "${ECHO}" -n "$1"
}

ship_line() {
    report="${report}${1}\n"
}

testcount=0
failcount=0
skipcount=0
todocount=0
test_before_plan=no
test_after_plan=no
expect=""
status=0

report=""
IFS=""
state=start
while read -r line
do
    if expr "$line" : "Bail out!" >/dev/null
    then
	ship_line "$line"
	status=2
	break
    fi
    if expr "$line" : '1\.\.[0-9][0-9]*' >/dev/null >/dev/null
    then
	if [ "$expect" != "" ]
	then
	    if [ "${testcount}" -gt 0 ]
	    then
		echo ""
	    fi
	    ship_line "Cannot have more than one plan line."
	    echo "${report}"
	    exit 1
	fi
	if expr "$line" : ".* *SKIP" >/dev/null || expr "$line" : ".* *skip" >/dev/null
	then
	    ship_line "$line"
	    echo "${report}"
	    exit 1	# Not specified in the standard whether this should exit 1 or 0
	fi
	expect=$(expr "$line" : '1\.\.\([0-9][0-9]*\)')
	continue
    fi
    if expr "$line" : "ok" >/dev/null
    then
	testcount=$((testcount + 1))
	if [ "$expect" = "" ]
	then
	    test_before_plan=yes
	else
	    test_after_plan=yes
	fi
	if expr "$line" : ".*# *TODO" >/dev/null || expr "$line" : ".*# *todo" >/dev/null
	then
	    ship_char ${TODO_OK}
	    ship_line "$line"
	    todocount=$((todocount + 1))
	elif expr "$line" : ".*# *SKIP" >/dev/null || expr "$line" : ".*# *skip" >/dev/null
	then
	    ship_char ${SKIP}
	    ship_line "$line"
	    skipcount=$((skipcount + 1))
	else
	    ship_char ${OK}
	fi
	state=ok
	continue
    fi
    if expr "$line" : "not ok" >/dev/null
    then
	testcount=$((testcount + 1))
	if [ "$expect" = "" ]
	then
	    test_before_plan=yes
	else
	    test_after_plan=yes
	fi
	if expr "$line" : ".*# *SKIP" >/dev/null || expr "$line" : ".*# *skip" >/dev/null
	then
	    ship_char "${SKIP}"
	    state=ok
	    skipcount=$((skipcount + 1))
	    continue
	fi
	if expr "$line" : ".*# *TODO" >/dev/null || expr "$line" : ".*# *todo" >/dev/null
	then
	    ship_char ${TODO_NOT_OK}
	    state=ok
	    todocount=$((todocount + 1))
	    continue
	fi
	ship_char "${FAIL}"
	ship_line "$line"
	state=not_ok
	failcount=$((failcount + 1))
	status=1
	continue
    fi
    # shellcheck disable=SC2166
    if [ "${state}" = "yaml" ]
    then
	ship_line "$line"
	if expr "$line" : '[ 	]*\.\.\.' >/dev/null
	then
	    state=ok
	fi
    elif expr "$line" : "[ 	]*---" >/dev/null
    then
	ship_line "$line"
	state=yaml
    fi
done

/bin/echo ""

if [ -z "$expect" ]
then
    ship_line "Missing a plan."
    status=1
elif [ "$test_before_plan" = "yes" ] && [ "$test_after_plan" = "yes" ] 
then
    ship_line "A plan line may only be placed before or after all tests."
    status=1
elif [ "${expect}" -gt "${testcount}" ]
then
    ship_line "Expected ${expect} tests but only ${testcount} ran."
    status=1
elif [ "${expect}" -lt "${testcount}" ]
then
    ship_line "Expected ${expect} tests but ${testcount} ran."
    status=1
fi

report="${report}${testcount} tests, ${failcount} failures"
if [ "$todocount" != 0 ]
then
    report="${report}, ${todocount} TODOs"
fi
if [ "$skipcount" != 0 ]
then
    report="${report}, ${skipcount} SKIPs"
fi

echo "${report}."

exit "${status}"

# end