Add a Bash version

.gitignore

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+/tests/data/have1.txt

rshasum.bash

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+#!/bin/bash
+#
+# Copyright (C) 2018 Shlomi Fish <[email protected]>
+#
+# Distributed under the terms of the ISC license.
+#
+
+export SUM="${RSHASUM_SUM:-sha256sum}"
+tfn="`mktemp`"
+find . -type f -follow | (LC_ALL=C sort) | xargs -d '\n' "$SUM" | tee "$tfn"
+"$SUM" - < "$tfn"
+rm -f "$tfn"

tests/data/1/0.txt

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+test string

tests/data/1/2.txt

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+toast ::: string

tests/data/want1.txt

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+d5579c46dfcc7f18207013e65b44e4cb4e2c2298f4ac457ba8f82743f31e930b  ./0.txt
+7ea4c2a1c490e653b0ea37bb1a087553380ba642536dabbb2f3b4eb3a2bd6fdf  ./2.txt
+767cd9df9f4f5b9245d06ab083d6fd09e2a02e9724f8b595a805b7e1980daa22  -

tests/test-bash.t

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+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 1;
+use Test::Differences (qw( eq_or_diff ));
+use IO::All qw/ io /;
+use Cwd qw/ getcwd /;
+
+{
+    my $cwd = getcwd();
+    system(qq%cd tests/data/1/ && "$cwd"/rshasum.bash > ../have1.txt%);
+
+    # TEST
+    eq_or_diff(
+        io->file("tests/data/have1.txt")->all,
+        io->file("tests/data/want1.txt")->all,
+        "rshasum #1",
+    );
+}