mirror of https://github.com/rwxrob/bonzai
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
78 lines
1.9 KiB
Go
78 lines
1.9 KiB
Go
// Copyright 2022 Robert S. Muhlestein.
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
package bonzai
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"os"
|
|
"strings"
|
|
)
|
|
|
|
// Method defines the main code to execute for a command (Cmd). By
|
|
// convention the parameter list should be named "args" if there are
|
|
// args expected and underscore (_) if not. Methods must never write
|
|
// error output to anything but standard error and should almost always
|
|
// use the log package to do so.
|
|
type Method func(caller *Cmd, args ...string) error
|
|
|
|
// ----------------------- errors, exit, debug -----------------------
|
|
|
|
// DoNotExit effectively disables Exit and ExitError allowing the
|
|
// program to continue running, usually for test evaluation.
|
|
var DoNotExit bool
|
|
|
|
// ExitOff sets DoNotExit to false.
|
|
func ExitOff() { DoNotExit = true }
|
|
|
|
// ExitOn sets DoNotExit to true.
|
|
func ExitOn() { DoNotExit = false }
|
|
|
|
// Exit calls os.Exit(0) unless DoNotExit has been set to true. Cmds
|
|
// should never call Exit themselves returning a nil error from their
|
|
// Methods instead.
|
|
func Exit() {
|
|
if !DoNotExit {
|
|
os.Exit(0)
|
|
}
|
|
}
|
|
|
|
// ExitError prints err and exits with 1 return value unless DoNotExit
|
|
// has been set to true. Commands should usually never call ExitError
|
|
// themselves returning an error from their Method instead.
|
|
func ExitError(err ...interface{}) {
|
|
switch e := err[0].(type) {
|
|
case string:
|
|
if len(e) > 1 {
|
|
log.Printf(e+"\n", err[1:]...)
|
|
} else {
|
|
log.Println(e)
|
|
}
|
|
case error:
|
|
out := fmt.Sprintf("%v", e)
|
|
if len(out) > 0 {
|
|
log.Println(out)
|
|
}
|
|
}
|
|
if !DoNotExit {
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
|
|
// ArgsFrom returns a list of field strings split on space with an extra
|
|
// trailing special space item appended if the line has any trailing
|
|
// spaces at all signifying a definite word boundary and not a potential
|
|
// prefix.
|
|
func ArgsFrom(line string) []string {
|
|
args := []string{}
|
|
if line == "" {
|
|
return args
|
|
}
|
|
args = strings.Fields(line)
|
|
if line[len(line)-1] == ' ' {
|
|
args = append(args, "")
|
|
}
|
|
return args
|
|
}
|