2 files changed, 99 insertions, 0 deletions
diff --git a/debug/debug.go b/debug/debug.go
new file mode 100644
index 0000000..9af3d9d
--- /dev/null
+++ b/debug/debug.go
@@ -0,0 +1,97 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package debug
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"runtime/debug"
+
+)
+
+var writer io.Writer
+
+func init() {
+	var err error
+	writer, err = os.OpenFile("/tmp/gomuks-debug.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
+	if err != nil {
+		writer = nil
+	}
+}
+
+func Printf(text string, args ...interface{}) {
+	if writer != nil {
+		fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
+		fmt.Fprintf(writer, text+"\n", args...)
+	}
+}
+
+func Print(text ...interface{}) {
+	if writer != nil {
+		fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
+		fmt.Fprintln(writer, text...)
+	}
+}
+
+func PrintStack() {
+	if writer != nil {
+		data := debug.Stack()
+		writer.Write(data)
+	}
+}
+
+const Oops = ` __________
+< Oh noes! >
+ ‾‾‾\‾‾‾‾‾‾
+     \   ^__^
+      \  (XX)\_______
+         (__)\       )\/\
+          U  ||----W |
+             ||     ||`
+
+func PrettyPanic() {
+	fmt.Println(Oops)
+	fmt.Println("")
+	fmt.Println("A fatal error has occurred.")
+	fmt.Println("")
+	traceFile := fmt.Sprintf("/tmp/gomuks-panic-%s.txt", time.Now().Format("2006-01-02--15-04-05"))
+	data := debug.Stack()
+	err := ioutil.WriteFile(traceFile, data, 0644)
+	if err != nil {
+		fmt.Println("Saving the stack trace to", traceFile, "failed:")
+		fmt.Println("--------------------------------------------------------------------------------")
+		fmt.Println(err)
+		fmt.Println("--------------------------------------------------------------------------------")
+		fmt.Println("")
+		fmt.Println("You can file an issue at https://github.com/tulir/gomuks/issues.")
+		fmt.Println("Please provide the file save error (above) and the stack trace of the original error (below) when filing an issue.")
+		fmt.Println("")
+		fmt.Println("--------------------------------------------------------------------------------")
+		debug.PrintStack()
+		fmt.Println("--------------------------------------------------------------------------------")
+	} else {
+		fmt.Println("The stack trace has been saved to", traceFile)
+		fmt.Println("")
+		fmt.Println("You can file an issue at https://github.com/tulir/gomuks/issues.")
+		fmt.Println("Please provide the contents of that file when filing an issue.")
+	}
+	os.Exit(1)
+}
diff --git a/debug/doc.go b/debug/doc.go
new file mode 100644
index 0000000..253441c
--- /dev/null
+++ b/debug/doc.go
@@ -0,0 +1,2 @@
+// Package debug contains utilities to log debug messages and display panics nicely.
+package debug