#!/bin/sh

# GNU diff is the reference for all of these results.

hgdiff() {

    hg diff "$@" | sed "s/\(\(---\|+++\) [a-zA-Z0-9_/.-]*\).*/\1/"

}

test_added_blank_lines() {

    printf '\nhello world\n\ngoodbye world\n\n' >foo

    echo '>>> two diffs showing three added lines <<<'

    hgdiff

    hgdiff -b

    echo '>>> no diffs <<<'

    hgdiff -B

    hgdiff -Bb

}

test_added_horizontal_space_first_on_a_line() {

    printf '\t hello world\ngoodbye world\n' >foo

    echo '>>> four diffs showing added space first on the first line <<<'

    hgdiff

    hgdiff -b

    hgdiff -B

    hgdiff -Bb

}

test_added_horizontal_space_last_on_a_line() {

    printf 'hello world\t \ngoodbye world\n' >foo

    echo '>>> two diffs showing space appended to the first line <<<'

    hgdiff

    hgdiff -B

    echo '>>> no diffs <<<'

    hgdiff -b

    hgdiff -Bb

}

test_added_horizontal_space_in_the_middle_of_a_word() {

    printf 'hello world\ngood bye world\n' >foo

    echo '>>> four diffs showing space inserted into "goodbye" <<<'

    hgdiff

    hgdiff -B

    hgdiff -b

    hgdiff -Bb

}

test_increased_horizontal_whitespace_amount() {

    printf 'hello world\ngoodbye\t\t  \tworld\n' >foo

    echo '>>> two diffs showing changed whitespace amount in the last line <<<'

    hgdiff

    hgdiff -B

    echo '>>> no diffs <<<'

    hgdiff -b

    hgdiff -Bb

}

test_added_blank_line_with_horizontal_whitespace() {

    printf 'hello world\n \t\ngoodbye world\n' >foo

    echo '>>> four diffs showing added blank line w/horizontal space <<<'

    hgdiff

    hgdiff -B

    hgdiff -b

    hgdiff -Bb

}

hg init

printf 'hello world\ngoodbye world\n' >foo

hg ci -Amfoo -ufoo -d '0 0'

test_added_blank_lines

test_added_horizontal_space_first_on_a_line

test_added_horizontal_space_last_on_a_line

test_added_horizontal_space_in_the_middle_of_a_word

test_increased_horizontal_whitespace_amount

test_added_blank_line_with_horizontal_whitespace