Major restructuring to switch build system from old scripts to GNU Automake.

tests/Display_-_--buffer-percent.test

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# Check that "--buffer-percent" displays correctly.
+
+# Dummy assignments for "shellcheck".
+testSubject="${testSubject:-false}"; workFile1="${workFile1:-.tmp1}"
+
+# The output should show 100% and 0% as the buffer initially fills up due to
+# there being nowhere to write it to, and then empties.
+( dd if=/dev/zero bs=1024 count=1024; sleep 2; ) 2>/dev/null \
+| "${testSubject}" -f -T -i 0.5 -B 1024 2>"${workFile1}" \
+| (sleep 1; dd bs=1024 count=512; sleep 1; cat; ) >/dev/null 2>&1
+
+differentLines=$(tr '\r' '\n' < "${workFile1}" | sed '/^ *$/d' | sort | uniq | wc -l | tr -dc '0-9')
+test "${differentLines}" -gt 1 && exit 0
+
+echo "expected output changes not seen"
+tr '\r' '\n' < "${workFile1}" | sed 's/^ *$/d' | sort | uniq
+exit 1
+
+# EOF