From 421f3f981e67cf787b0d88a069ea8f9c634caf70 Mon Sep 17 00:00:00 2001
From: Sami Samhuri <sami@samhuri.net>
Date: Sun, 16 Jan 2022 00:24:26 -0800
Subject: [PATCH] Improve portability of Makefile

---
 .gitignore     |  2 ++
 Makefile       | 10 +++++-----
 dependency-dir | 17 +++++++++++++++++
 3 files changed, 24 insertions(+), 5 deletions(-)
 create mode 100644 .gitignore
 create mode 100755 dependency-dir

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1b5294f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.o
+a1
diff --git a/Makefile b/Makefile
index 1716472..2673d9b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,13 +1,13 @@
 CFLAGS = -Wall -g
-CPPFLAGS = -I/usr/local/opt/readline/include
-LDFLAGS = -L/usr/local/opt/readline/lib
+CPPFLAGS = -I$(shell ./dependency-dir)/readline/include
+LDFLAGS = -L$(shell ./dependency-dir)/readline/lib
 
 OBJS = utils.o builtins.o exec.o jobs.o main.o
 
-all: a1 
+all: a1
 
 a1: $(OBJS)
 	$(CC) $(CFLAGS) -o a1 $(OBJS) $(LDFLAGS) -lreadline -lhistory -ltermcap
 
-clean: 
-	rm -rf $(OBJS) a1 
+clean:
+	rm -rf $(OBJS) a1
diff --git a/dependency-dir b/dependency-dir
new file mode 100755
index 0000000..144a292
--- /dev/null
+++ b/dependency-dir
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+if [[ $(uname -s) = Darwin ]]; then
+    if command -v brew >/dev/null 2>/dev/null; then
+        echo $(brew --prefix)/opt
+    elif [[ -x /opt/homebrew/bin/brew ]]; then
+        echo $(/opt/homebrew/bin/brew -- prefix)/opt
+    elif [[ -x $HOME/homebrew/bin/brew ]]; then
+        echo $($HOME/homebrew/bin/brew --prefix)/opt
+    elif [[ -x /usr/local/bin/brew ]]; then
+        echo $(/usr/local/bin/brew --prefix)/opt
+    else
+        echo /usr/local
+    fi
+else
+    echo /usr
+fi