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shell_pwsh.go
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shell_pwsh.go
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package cmd
import (
"fmt"
"regexp"
)
type pwsh struct{}
// Pwsh shell instance
var Pwsh Shell = pwsh{}
func (sh pwsh) Hook() (string, error) {
const hook = `using namespace System;
using namespace System.Management.Automation;
$hook = [EventHandler[LocationChangedEventArgs]] {
param([object] $source, [LocationChangedEventArgs] $eventArgs)
end {
$export = {{.SelfPath}} export pwsh;
if ($export) {
Invoke-Expression -Command $export;
}
}
};
$currentAction = $ExecutionContext.SessionState.InvokeCommand.LocationChangedAction;
if ($currentAction) {
$ExecutionContext.SessionState.InvokeCommand.LocationChangedAction = [Delegate]::Combine($currentAction, $hook);
}
else {
$ExecutionContext.SessionState.InvokeCommand.LocationChangedAction = $hook;
};
`
return hook, nil
}
func (sh pwsh) Export(e ShellExport) (out string) {
for key, value := range e {
if value == nil {
out += sh.unset(key)
} else {
out += sh.export(key, *value)
}
}
return out
}
func (sh pwsh) Dump(env Env) (out string) {
for key, value := range env {
out += sh.export(key, value)
}
return
}
func (sh pwsh) export(key, value string) string {
value = sh.escape(value)
if !regexp.MustCompile(`'.*'`).MatchString(value) {
value = fmt.Sprintf("'%s'", value)
}
return fmt.Sprintf("$env:%s=%s;", sh.escape(key), value)
}
func (sh pwsh) unset(key string) string {
return fmt.Sprintf("Remove-Item -Path 'env:/%s';", sh.escape(key))
}
func (pwsh) escape(str string) string {
return PowerShellEscape(str)
}
func PowerShellEscape(str string) string {
if str == "" {
return "''"
}
in := []byte(str)
out := ""
i := 0
l := len(in)
escape := false
hex := func(char byte) {
escape = true
out += fmt.Sprintf("\\x%02x", char)
}
backslash := func(char byte) {
escape = true
out += string([]byte{BACKTICK, char})
}
escaped := func(str string) {
escape = true
out += str
}
quoted := func(char byte) {
escape = true
out += string([]byte{char})
}
literal := func(char byte) {
out += string([]byte{char})
}
for i < l {
char := in[i]
switch {
case char == ACK:
hex(char)
case char == TAB:
escaped("`t")
case char == LF:
escaped("`n")
case char == CR:
escaped("`r")
case char <= US:
hex(char)
// case char <= AMPERSTAND:
// quoted(char)
case char == SINGLE_QUOTE:
backslash(char)
case char <= PLUS:
quoted(char)
case char <= NINE:
literal(char)
// case char <= QUESTION:
// quoted(char)
case char <= UPPERCASE_Z:
literal(char)
// case char == OPEN_BRACKET:
// quoted(char)
// case char == BACKSLASH:
// quoted(char)
case char == UNDERSCORE:
literal(char)
// case char <= CLOSE_BRACKET:
// quoted(char)
// case char <= BACKTICK:
// quoted(char)
// case char <= TILDA:
// quoted(char)
case char == DEL:
hex(char)
default:
quoted(char)
}
i++
}
if escape {
out = "'" + out + "'"
}
return out
}