🔨 Heavily improve Makefile + Add 'install' target.

Signed-off-by: yc <yc@hackclub.app>

Makefile

@@ -1,14 +1,24 @@
 CC = cc
 CFLAGS = -O4 -Ofast -march=native -flto -fomit-frame-pointer -finline-functions -funroll-loops -std=c2x
 DIR = cgi
+PREFIX = ~
+
+FIND = find
+CP = cp
 
 SOURCES = $(wildcard $(DIR)/*.c)
 TARGETS = $(patsubst $(DIR)/%.c,%,$(SOURCES))
 
+.PHONY: all install clean
+
 all: $(TARGETS)
 
 %: $(DIR)/%.c
 	$(CC) $(CFLAGS) -o $(DIR)/$@ $<
 
+install: $(TARGETS)
+	mkdir -p $(PREFIX)/$(DIR)
+	$(FIND) $(DIR)/ -type f -exec file {} \; | grep "executable" | cut -d: -f1 | xargs -I {} $(CP) {} $(PREFIX)/$(DIR)
+
 clean:
-	find $(DIR)/ -type f ! -name '*.c' -exec rm -f {} \;
+	$(FIND) $(DIR)/ -type f ! -name '*.c' -exec rm -f {} \;