mirror of
https://github.com/JetSetIlly/Gopher2600.git
synced 2025-04-02 11:02:17 -04:00
dd4faef536
addtional help wasn't being printed (when asked) if there were no arguments specified added MinMax() function. added ParseTooFewArgs and ParseTooManyArgs values for ParseResult type.
93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
// This file is part of Gopher2600.
|
|
//
|
|
// Gopher2600 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.
|
|
//
|
|
// Gopher2600 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 Gopher2600. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
package modalflag
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"strings"
|
|
)
|
|
|
|
// helpWriter is used to amend the default output from the flag package.
|
|
type helpWriter struct {
|
|
// the last []byte sent to the Write() function
|
|
buffer []byte
|
|
}
|
|
|
|
// Clear contents of output buffer.
|
|
func (hw *helpWriter) Clear() {
|
|
hw.buffer = []byte{}
|
|
}
|
|
|
|
func (hw *helpWriter) Help(output io.Writer, banner string, subModes []string, additionalHelp string) {
|
|
s := string(hw.buffer)
|
|
helpLines := strings.Split(s, "\n")
|
|
|
|
// output "no help available" message if there is no flag information and no
|
|
// sub-modes
|
|
if s == "Usage:\n" && len(subModes) == 0 {
|
|
if additionalHelp != "" {
|
|
output.Write([]byte(additionalHelp))
|
|
output.Write([]byte("\n"))
|
|
return
|
|
}
|
|
|
|
output.Write([]byte("No help available"))
|
|
if banner != "" {
|
|
output.Write([]byte(fmt.Sprintf(" for %s", banner)))
|
|
}
|
|
output.Write([]byte("\n"))
|
|
return
|
|
}
|
|
|
|
if banner != "" {
|
|
// supplement default banner with additional string
|
|
output.Write([]byte(fmt.Sprintf("%s for %s mode\n", helpLines[0], banner)))
|
|
} else {
|
|
// there is no banner so just print the default flag package banner
|
|
output.Write([]byte(helpLines[0]))
|
|
output.Write([]byte("\n"))
|
|
}
|
|
|
|
// add help message produced by flag package
|
|
if len(helpLines) > 1 {
|
|
s := strings.Join(helpLines[1:], "\n")
|
|
output.Write([]byte(s))
|
|
}
|
|
|
|
// add sub-mode information
|
|
if len(subModes) > 0 {
|
|
// add an additional new line if we've already printed flag information
|
|
if len(helpLines) > 2 {
|
|
output.Write([]byte("\n"))
|
|
}
|
|
|
|
output.Write([]byte(fmt.Sprintf(" available sub-modes: %s\n", strings.Join(subModes, ", "))))
|
|
output.Write([]byte(fmt.Sprintf(" default: %s\n", subModes[0])))
|
|
}
|
|
|
|
if additionalHelp != "" {
|
|
output.Write([]byte("\n"))
|
|
output.Write([]byte(additionalHelp))
|
|
output.Write([]byte("\n"))
|
|
}
|
|
}
|
|
|
|
// Write buffers all output.
|
|
func (hw *helpWriter) Write(p []byte) (n int, err error) {
|
|
hw.buffer = append(hw.buffer, p...)
|
|
return len(p), nil
|
|
}
|