#!/bin/bash

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

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

# Compress files.
# On success, the input files are removed and replaced by new
# files with the .gz suffix.
echo -n "foo " > f1
echo "bar" > f2
testing "with input files" "gzip f1 f2 && 
    test -f f1.gz && test -f f2.gz && 
    ! test -f f1 && ! test -f f2 && 
    zcat f1.gz f2.gz" "foo bar\n" "" ""
rm -f f1 f2 f1.gz f2.gz

# With no files, compresses stdin to stdout.
testing "no files (stdin to stdout)" "echo hello world | gzip > f.gz && 
    test -f f.gz && zcat f.gz" "hello world\n" "" ""
rm -f f.gz

# -c	Output to stdout
echo -n "foo " > f1
echo "bar" > f2
testing "with input files and -c" "gzip -c f1 f2 > out.gz && 
    ! test -f f1.gz && ! test -f f2.gz && 
    test -f f1 && test -f f2 && 
    zcat out.gz" "foo bar\n" "" ""
rm -f f1 f2 out.gz

# -d	Decompress (act as gunzip)
echo "hello world" | gzip > f.gz
testing "-d (act as gunzip)" "gzip -d f.gz && 
    test -f f && ! test -f f.gz && cat f" "hello world\n" "" ""
rm -f f.gz f

echo "hello world" | gzip > f.gz
testing "-dc (act as zcat)" "gzip -dc f.gz && 
    ! test -f f && test -f f.gz" "hello world\n" "" ""
rm -f f.gz f

# -f	Force: allow overwrite of output file
echo "hello world" > f1
echo "precious data" > f1.gz
testing "no overwrite without -f" \
    "gzip f1 2>/dev/null || echo refused && cat f1 f1.gz" \
    "refused\nhello world\nprecious data\n" "" ""
testing "overwrite with -f" \
    "gzip -f f1 && echo allowed && ! test -f f1 && zcat f1.gz" \
    "allowed\nhello world\n" "" ""
rm -f f1 f1.gz

# -k	Keep input files (don't remove)
echo "hello world" > f1
testing "-k" "gzip -k f1 && cat f1 && zcat f1.gz" \
    "hello world\nhello world\n" "" ""
rm -f f1 f1.gz

# Test that -9 compresses better than -1.
for i in $(seq 1 1000) ; do echo "hello world" >> x ; done
gzip -c1 x > x1.gz
gzip -c9 x > x9.gz
testing "-1 vs -9" \
    "test $(stat -c '%s' x1.gz) -gt $(stat -c '%s' x9.gz) && echo okay" \
    "okay\n" "" ""
rm -f x x1.gz x9.gz

# Test that gzip preserves permissions and times.
export TZ=UTC
echo "hello world" > f1
chmod 0411 f1
touch -a -t 197801020304 f1
touch -m -t 198704030201 f1
testing "permissions/times preservation" \
    "gzip -k f1 && TZ=UTC stat -c '%a %Y' f1 && stat -c '%a %X %Y' f1.gz" \
    "411 544413660\n411 252558240 544413660\n" "" ""
rm -f f1 f1.gz