test: Polish test script to work on single project or all at once

test/main.sh

@@ -1,12 +1,18 @@
 #!/bin/bash
 
-CC_COMMAND='g++ -Wall -Wextra -Werror -pedantic -D__PROGTEST__'
+CC_COMMAND='g++ -Wall -Wextra -Werror -pedantic -D__PROGTEST__ -Wdouble-promotion -Wfloat-conversion'
 
 RED="\e[31m"
 GREEN="\e[32m"
 YELLOW="\e[33m"
 RESET="\e[0m"
 
+if [[ "$1" =~ --all|-a ]]; then
+	check_all=true
+else
+	check_all=false
+fi
+
 EXIT_STATUS=0
 
 _log() {
@@ -36,23 +42,30 @@ _log() {
 	printf "[${log_color}${log_level_name}${RESET}] %s\n" "$log_message"
 }
 
-for dir in homework-* exercise-*; do
+_test_dir() {
+	local dir="$1"
+
 	if ! cd "$dir" > /dev/null; then
 		_log 2 "Couldn't cd into $dir"
-		cd ..
-		continue
+		return 1
 	fi
 
+	local dir_name="${PWD##*/}"
+
 	if [[ ! -f ./main.c ]]; then
-		_log 1 "No main.c file in $dir"
-		cd ..
-		continue
+		_log 1 "No main.c file in $dir_name"
+		return 1
+	fi
+
+	if [[ ! -d ./test_data ]]; then
+		_log 1 "No test_data directory in $dir_name"
+		return 1
 	fi
 
 	if ! eval "$CC_COMMAND main.c"; then
-		_log 2 "Failed to compile code in $dir"
-		cd ..
-		continue
+		_log 2 "Failed to compile code in $dir_name"
+		EXIT_STATUS=1
+		return 1
 	fi
 
 	failed_inputs=0
@@ -61,22 +74,25 @@ for dir in homework-* exercise-*; do
 		input_file=${input//*\/}
 		test_case_number=${input_file%%_in.txt}
 
-		command_output="$(diff <(./a.out < "test_data/${test_case_number}_in.txt") "test_data/${test_case_number}_out.txt")"
-
-		if [[ ! "$?" ]]; then
+		if ! diff --color <(./a.out < "test_data/${test_case_number}_in.txt")  "test_data/${test_case_number}_out.txt"; then
 			EXIT_STATUS=1
 			((failed_inputs++))
 			_log 2 "$dir (#$test_case_number)"
-			echo "$command_output"
 		fi
-
 	done
 
 	if ((failed_inputs == 0)); then
-		_log 0 "$dir"
+		_log 0 "$dir_name"
 	fi
+}
 
+if ! $check_all; then
+	_test_dir .
+else
+	for dir in homework-* exercise-*; do
+		_test_dir "$dir"
 		cd .. > /dev/null
-done
+	done
+fi
 
 exit $EXIT_STATUS