#!/bin/sh

. "${srcdir=.}/init.sh"; path_prepend_ ../src

TZ=UTC0

export TZ

fail=0

echo a > a

echo b > b

epoch='1970-01-01 00:00:00'

touch -t 197001010000.00 a b

e=$(printf '\033')

tab=$(printf '\t')

gen_exp_u()

{

    local epoch_plus="$epoch.000000000 +0000"

    local rs=$(printf "$e[${rs}m")

    local hd=$(printf "$e[${hd}m")

    local ad=$(printf "$e[${ad}m")

    local de=$(printf "$e[${de}m")

    local ln=$(printf "$e[${ln}m")

    printf '%s' \

"$hd--- a$tab$epoch_plus

+++ b$tab$epoch_plus

$rs${ln}@@ -1 +1 @@$rs

$de-a$rs

$ad+b$rs

"

}

gen_exp_c()

{

    local epoch_posix_1003_1_2001="Thu Jan  1 00:00:00 1970"

    local rs=$(printf "$e[${rs}m")

    local hd=$(printf "$e[${hd}m")

    local ad=$(printf "$e[${ad}m")

    local de=$(printf "$e[${de}m")

    local ln=$(printf "$e[${ln}m")

    printf '%s' \

"$hd*** a$tab$epoch_posix_1003_1_2001

--- b$tab$epoch_posix_1003_1_2001

$rs***************

$ln*** 1 ****$rs

$de! a$rs

$ln--- 1 ----$rs

$ad! b$rs

"

}

gen_exp_default()

{

    printf '%s' \

"1c1

< a

---

> b

"

}

gen_exp_default_colors()

{

    local rs=$(printf "$e[${rs}m")

    local hd=$(printf "$e[${hd}m")

    local ad=$(printf "$e[${ad}m")

    local de=$(printf "$e[${de}m")

    local ln=$(printf "$e[${ln}m")

    printf '%s' \

"${ln}1c1$rs

$de< a$rs

---

$ad> b$rs

"

}

# Compare with some known outputs

rs=0 hd=1 ad=32 de=31 ln=36

returns_ 1 diff --color=auto a b > out || fail=1

gen_exp_default > exp || framework_failure_

compare exp out || fail=1

returns_ 1 env TERM=dumb diff ---presume-output-tty --color=auto a b > out \

  || fail=1

gen_exp_default > exp || framework_failure_

compare exp out || fail=1

returns_ 1 diff --color=never a b > out || fail=1

gen_exp_default > exp || framework_failure_

compare exp out || fail=1

returns_ 1 diff a b > out || fail=1

gen_exp_default > exp || framework_failure_

compare exp out || fail=1

returns_ 1 diff --color=always a b > out || fail=1

gen_exp_default_colors > exp || framework_failure_

compare exp out || fail=1

returns_ 1 diff -u --color=always a b > out || fail=1

gen_exp_u > exp || framework_failure_

compare exp out || fail=1

returns_ 1 diff -c --color=always a b > out || fail=1

gen_exp_c > exp || framework_failure_

compare exp out || fail=1

rs=0 hd=33 ad=34 de=35 ln=36

returns_ 1 diff -u --color=always \

  --palette="rs=0:hd=33:ad=34:de=35:ln=36" a b > out || fail=1

gen_exp_u > exp || framework_failure_

compare exp out || fail=1

# Before the fix in http://debbugs.gnu.org/22067,

# this test would trigger an infinite loop bug.

mkfifo fifo

printf '%*s-a' 1000000 > a

printf '%*s-b' 1000000 > b

head -c 10 < fifo > /dev/null &

diff --color=always ---presume-output-tty a b > fifo

test $? = 141 || fail=1

Exit $fail