locheck: add support for linux. (Asana#56)

* locheck: add support for linux.

* Makefile: fix build path.

Makefile

@@ -2,9 +2,18 @@ EXECUTABLE_NAME = locheck
 REPO = https://github.com/Asana/locheck
 VERSION = 0.9.11
 
+UNAME_S := $(shell uname -s)
+
+ifeq ($(UNAME_S), Darwin)
+	BUILD_PATH_PREFIX := .build/apple/Products/Release
+endif
+ifeq ($(UNAME_S), Linux)
+	BUILD_PATH_PREFIX := .build/release
+endif
+
 PREFIX = /usr/local
 INSTALL_PATH = $(PREFIX)/bin/$(EXECUTABLE_NAME)
-BUILD_PATH = .build/apple/Products/Release/$(EXECUTABLE_NAME)
+BUILD_PATH = $(BUILD_PATH_PREFIX)/$(EXECUTABLE_NAME)
 CURRENT_PATH = $(PWD)
 RELEASE_TAR = $(REPO)/archive/$(VERSION).tar.gz
 GIT_STATUS := $(shell git status -s)

Sources/LocheckCommand/main.swift

@@ -6,11 +6,16 @@
 //
 
 import ArgumentParser
-import Darwin
 import Files
 import Foundation
 import LocheckLogic
 
+#if os(Linux) || os(FreeBSD)
+    import func Glibc.exit
+#else
+    import func Darwin.exit
+#endif
+
 let version = "0.9.11"
 
 struct Locheck: ParsableCommand {
@@ -42,7 +47,7 @@ private func withProblemReporter(
     block(problemReporter)
     if problemReporter.hasError || (treatWarningsAsErrors && problemReporter.hasWarning) {
         print("Errors found")
-        Darwin.exit(1)
+        exit(1)
     }
     print("Finished validating")
 }

Sources/LocheckLogic/ProblemReporter.swift

@@ -5,10 +5,16 @@
 //  Created by Steve Landey on 8/18/21.
 //
 
-import func Darwin.fputs
-import var Darwin.stderr
 import Foundation
 
+#if os(Linux) || os(FreeBSD)
+    import func Glibc.fputs
+    import var Glibc.stderr
+#else
+    import func Darwin.fputs
+    import var Darwin.stderr
+#endif
+
 private struct StderrOutputStream: TextOutputStream {
     mutating func write(_ string: String) {
         fputs(string, stderr)