Detect if in TTY; output version info

cmd/service/main.go

@@ -8,6 +8,8 @@ import (
 	"os"
 
 	"git.kettek.net/accord/service/internal/cfg"
+	"git.kettek.net/accord/service/internal/version"
+	"git.kettek.net/accord/service/pkg/istty"
 )
 
 func main() {
@@ -18,9 +20,14 @@ func main() {
 	readChannel := make(chan AMessage)
 	quitChannel := make(chan error)
 
-	// Start our STDIN read loop
-	if cfg.UsePipes {
-		go readLoop(os.Stdin, quitChannel, readChannel)
+	if istty.Is() {
+		fmt.Println("Running from TTY, starting as stand-alone service.")
+		fmt.Printf("  Git Id: %s\n", version.GitCommitId)
+	} else {
+		// Start our STDIN read loop
+		if cfg.UsePipes {
+			go readLoop(os.Stdin, quitChannel, readChannel)
+		}
 	}
 
 	// Begin waiting for data on our channels.

internal/version/generate_nix.go

@@ -0,0 +1,4 @@
+// +build darwin,dragonfly,freebsd,linux,netbsd,openbsd,solaris
+package version
+
+//go:generate sh ./generate_nix.sh

internal/version/generate_nix.sh

@@ -0,0 +1,9 @@
+echo "// Code generated automatically; DO NOT EDIT." > version.go
+echo "package version" >> version.go
+echo "" >> version.go
+echo "var (" >> version.go
+echo "  // GitCommitId provides the git commit id used to build this service." >> version.go
+echo -n "  GitCommitId string = \"" >> version.go
+git log -n1 --format="%h" | tr -d '\n' >> version.go
+echo "\"" >> version.go
+echo ")" >> version.go

internal/version/version.go

@@ -0,0 +1,7 @@
+// Code generated automatically; DO NOT EDIT.
+package version
+
+var (
+  // GitCommitId provides the git commit id used to build this service.
+  GitCommitId string = "c198177"
+)

pkg/istty/istty.go

@@ -0,0 +1,17 @@
+package istty
+
+// #cgo CFLAGS: -g -Wall
+// #include "istty.h"
+import "C"
+
+// Is returns if the process context is a TTY.
+func Is() bool {
+	t := C.isTTY()
+
+	return bool(t)
+}
+
+// Close closes the TTY if possible.
+func Close() {
+	C.closeTTY()
+}

pkg/istty/istty.h

@@ -0,0 +1,36 @@
+#ifdef _WIN32
+#if       _WIN32_WINNT < 0x0500
+  #undef  _WIN32_WINNT
+  #define _WIN32_WINNT   0x0500
+#endif
+#include <windows.h>
+#include <stdbool.h>
+#include "Wincon.h" 
+
+bool isTTY() {
+  HWND consoleWnd = GetConsoleWindow();
+  DWORD dwProcessId;
+  GetWindowThreadProcessId(consoleWnd, &dwProcessId);
+  if (GetCurrentProcessId()==dwProcessId) {
+    return false;
+  }
+  return true;
+}
+
+void closeTTY() {
+  ShowWindow(GetConsoleWindow(), SW_HIDE);
+}
+#elif defined(__APPLE__) || defined(__linux) || defined(__unix) || defined(__posix)
+#include <stdio.h>
+#include <unistd.h>
+#include <stdbool.h>
+
+bool isTTY() {
+  if (isatty(fileno(stdin))) {
+    return true;
+  } 
+  return false;
+}
+
+void closeTTY() {}
+#endif