Use the $Commands environment variable as a list of directories where commands may be located.

bin/loader.cpp

@@ -646,10 +646,8 @@ bool file_exists(const std::string & name)
 	return ::stat(name.c_str(), &st) == 0 && S_ISREG(st.st_mode);
 }
 
-std::string find_exe(const std::string &name)
+std::string old_find_exe(const std::string &name)
 {
-	// TODO -- use the environment variable for directories.
-
 	if (file_exists(name)) return name;
 
 	// if name is a path, then it doesn't exist.
@@ -670,6 +668,65 @@ std::string find_exe(const std::string &name)
 }
 
 
+// this needs to run *after* the MPW environment variables are loaded.
+std::string find_exe(const std::string &name)
+{
+
+	// if this is an absolute or relative name, return as-is.
+
+	if (name.find(':') != name.npos) {
+		std::string path = ToolBox::MacToUnix(name);
+		if (file_exists(path)) return path;
+		return "";
+	}
+
+	if (name.find('/') != name.npos) {
+		if (file_exists(name)) return name;
+		return "";
+	}
+
+
+	// otherwise, check the Commands variable for locations.
+	std::string command = MPW::GetEnv("Commands");
+	if (command.empty()) return old_find_exe(name);
+
+
+	// string is , separated, possibly in MacOS format.
+	std::string::size_type begin = 0;
+	std::string::size_type end = 0;
+	for(;;)
+	{
+		std::string path;
+		end = command.find(',', begin);
+
+		if (end == std::string::npos) {
+
+			if (begin >= command.length()) return "";
+
+			path = command.substr(begin);
+		}
+		else
+		{
+			size_t count = end - begin - 1;
+			path = command.substr(begin, count);
+		}
+
+		if (!path.empty())
+		{
+			// convert to unix.
+			path = ToolBox::MacToUnix(path);
+			// should always have a length...
+			if (path.length() && path.back() != '/') path.push_back('/');
+			path.append(name);
+			if (file_exists(path)) return path;
+		}
+
+		if (end == std::string::npos) return "";
+		begin = end + 1;
+	}
+}
+
+
 void MainLoop()
 {
 	#if 0
@@ -868,14 +925,17 @@ int main(int argc, char **argv)
 	}
 
 
-	std::string command(argv[0]); // InitMPW updates argv...
 
+	MPW::InitEnvironment(defines);
+
+	std::string command(argv[0]); // InitMPW updates argv...
 	command = find_exe(command);
 	if (command.empty())
 	{
 		std::string mpw = MPW::RootDir();
 		fprintf(stderr, "Unable to find command %s\n", argv[0]);
 		fprintf(stderr, "$MPW = %s\n", mpw.c_str());
+		fprintf(stderr, "$Commands = %s\n", MPW::GetEnv("Commands").c_str());
 		exit(EX_USAGE);
 	}
 	argv[0] = ::strdup(command.c_str()); // hmm.. could setenv(mpw_command) instead.
@@ -893,7 +953,7 @@ int main(int argc, char **argv)
 
 	MM::Init(Memory, MemorySize, kGlobalSize, Flags.stackSize);
 	OS::Init();
-	MPW::Init(argc, argv, defines);
+	MPW::Init(argc, argv);
 
 
 	cpuStartup();

mpw/mpw.cpp

@@ -176,7 +176,33 @@ namespace MPW
 		return path; // unknown.
 	}
 
-	uint16_t Init(int argc, char **argv, const std::vector<std::string> &defines)
+	uint16_t InitEnvironment(const std::vector<std::string> &defines)
+	{
+		void EnvLoadFile(const std::string &envfile);
+		void EnvLoadArray(const std::vector<std::string> &data);
+
+		std::string m(RootDir());
+		if (!m.empty())
+		{
+			std::string mm = ToolBox::UnixToMac(m);
+			if (mm.back() != ':') mm.push_back(':');
+
+			Environment.emplace(std::string("MPW"), mm);
+		}
+
+		if (defines.size())
+			EnvLoadArray(defines);
+
+		if (!m.empty())
+		{
+			std::string path(RootDirPathForFile("Environment.text"));
+			EnvLoadFile(path);
+		}
+
+		return 0;
+	}
+
+	uint16_t Init(int argc, char **argv)
 	{
 		/*
 		FDTable.resize(16);
@@ -274,33 +300,10 @@ namespace MPW
 
 		}
 
-		// environment,
-		// just use $MPW and synthesize the other ones.
+		// environment
 		{
-			void EnvLoadFile(const std::string &envfile);
-			void EnvLoadArray(const std::vector<std::string> &data);
-
-			std::string m(RootDir());
-			if (!m.empty())
-			{
-				std::string mm = ToolBox::UnixToMac(m);
-				if (mm.back() != ':') mm.push_back(':');
-
-				Environment.emplace(std::string("MPW"), mm);
-			}
 			Environment.emplace(std::string("Command"), command);
 
-
-			if (defines.size())
-				EnvLoadArray(defines);
-
-			if (!m.empty())
-			{
-
-				std::string path(RootDirPathForFile("Environment.text"));
-				EnvLoadFile(path);
-			}
-
 			std::deque<std::string> e;
 
 			for (const auto &iter : Environment)

mpw/mpw.h

@@ -101,7 +101,8 @@ namespace MPW {
 
 
 	// should add argc/argv/envp...
-	uint16_t Init(int argc, char **argv, const std::vector<std::string> &defines);
+	uint16_t InitEnvironment(const std::vector<std::string> &defines);
+	uint16_t Init(int argc, char **argv);
 
 	uint32_t ExitStatus();
 

verbatim/Environment.text

@@ -16,6 +16,10 @@ ShellDirectory=$MPW
 SysTempFolder=/tmp/
 TempFolder=/tmp/
 
+# comma-separated list of directories, like $PATH
+# add . to include the current directory.
+Commands=${MPW}Tools:
+
 # MPW IIgs 1.1
 AIIGSIncludes=${MPW}Interfaces:AIIGSIncludes:
 RIIGSIncludes=${MPW}Interfaces:RIIGSIncludes: