add man(1) generation

1 files changed, 23 insertions, 0 deletions

diff --git a/spool/spool.go b/spool/spool.go
index e7b13e9..4335d50 100644
--- a/spool/spool.go
+++ b/spool/spool.go
@@ -3,6 +3,9 @@ package spool
 import (
 	"fmt"
 	"os"
+	"reflect"
+	"runtime/debug"
+	"strings"
 )
 
 var (
@@ -10,6 +13,10 @@ var (
 	Stdout = os.Stdout
 )
 
+type empty struct{}
+
+const PanicErrorCode = 8
+
 var Print = func(format string, values ...any) (any, error) {
 	return fmt.Fprintf(Stdout, format, values...)
 }
@@ -17,3 +24,19 @@ var Print = func(format string, values ...any) (any, error) {
 var Warn = func(format string, values ...any) (any, error) {
 	return fmt.Fprintf(Stderr, format, values...)
 }
+
+var Panic = func(code ExitCode, format string, values ...any) (any, error) {
+	pkg := reflect.TypeOf(empty{}).PkgPath()
+	v, err := fmt.Fprintf(Stderr, format, values...)
+	st := strings.Split(string(debug.Stack()), "\n")
+	for i, l := range st {
+		if strings.Contains(l, pkg) {
+			st = st[i:]
+			break
+		}
+	}
+
+	_, _ = Warn("%s\n", strings.Join(st, "\n"))
+	os.Exit(PanicErrorCode)
+	return v, err
+}