#!/bin/bash

[ -f testing.sh ] && . testing.sh

#testing "name" "command" "result" "infile" "stdin"

BIGTEST="one\ntwo\nthree\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n"
echo -ne "$BIGTEST" > file1
testing "tail" "tail && echo yes" "oneyes\n" "" "one"
testing "file" "tail file1" \
	"two\nthree\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n" "" ""
testing "-n in bounds" "tail -n 3 file1" "nine\nten\neleven\n" "" ""
testing "-n out of bounds" "tail -n 999 file1" "$BIGTEST" "" ""
testing "-n+ in bounds" "tail -n +3 file1" \
	"three\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n" "" ""
testing "-n+ outof bounds" "tail -n +999 file1" "" "" ""
testing "-c in bounds" "tail -c 27 file1" \
	"even\neight\nnine\nten\neleven\n" "" ""
testing "-c out of bounds" "tail -c 999 file1" "$BIGTEST" "" ""
testing "-c+ in bounds" "tail -c +27 file1" \
	"x\nseven\neight\nnine\nten\neleven\n" "" ""
testing "-c+ out of bonds" "tail -c +999 file1" "" "" ""
testing "-N" "tail -1 file1" "eleven\n" "" ""
rm file1

testing "stdin no trailing newline" "tail -n 1 - " "c" "" "a\nb\nc"
testing "file no trailing newline" "tail -n 1 input" "c" "a\nb\nc" ""

testing "noseek -n in bounds" "tail -n 3" "nine\nten\neleven\n" \
	"" "$BIGTEST"
testing "noseek -n out of bounds" "tail -n 999" "$BIGTEST" "" "$BIGTEST"
testing "noseek -n+ in bounds" "tail -n +3" \
	"three\nfour\nfive\nsix\nseven\neight\nnine\nten\neleven\n" "" \
	"$BIGTEST"
testing "noseek -n+ outof bounds" "tail -n +999" "" "" "$BIGTEST"
testing "noseek -c in bounds" "tail -c 27" \
	"even\neight\nnine\nten\neleven\n" "" "$BIGTEST"
testing "noseek -c out of bounds" "tail -c 999" "$BIGTEST" "" "$BIGTEST"
testing "noseek -c+ in bounds" "tail -c +27" \
	"x\nseven\neight\nnine\nten\neleven\n" "" "$BIGTEST"
testing "noseek -c+ out of bonds" "tail -c +999" "" "" "$BIGTEST"

makebigfile()
{
  for j in $(seq 1 100)
  do
    echo -n "$j "
    for i in $(seq 1 100)
    do
      echo -n 123456789abcefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
    done
    echo
  done
}
makebigfile > bigfile

testing "-c 12345 -n 3 bigfile" "tail -c 12345 -n 3 bigfile | md5sum" \
  "347bbdcbad8a313f4dc7bd558c5bfcb8  -\n" "" ""
testing "-n 3 -c 12345 bigfile" "tail -n 3 -c 12345 bigfile | md5sum" \
  "1698825a750288284ec3ba7d8a59f302  -\n" "" ""
rm bigfile

echo 111 > one
testing "-f one" \
  'tail -f one & sleep .25 ; echo two >> one; sleep .25; echo three >> one; sleep .25; kill $! >/dev/null' \
  "111\ntwo\nthree\n" "" ""
rm one

echo uno > one
echo dos > two
echo tres > three
testing "-f one two three" \
  'tail -f one two three & sleep .25 ; echo more >> three ; echo also >> one; sleep .25; kill $! >/dev/null' \
  "==> one <==\nuno\n\n==> two <==\ndos\n\n==> three <==\ntres\nmore\n\n==> one <==\nalso\n" "" ""
rm one two three

testing "-F" "tail -s .1 -F walrus 2>/dev/null & sleep .2; echo hello > walrus;
sleep .2; truncate -s 0 walrus; sleep .2; echo potato >> walrus; sleep .2;
echo hello >> walrus; sleep .2; rm walrus; sleep .2; echo done > walrus;
  sleep .5; kill %1" "hello\npotato\nhello\ndone\n" "" ""
rm -f walrus