1
2using namespace System.Management.Automation
3using namespace System.Management.Automation.Language
4
5Register-ArgumentCompleter -Native -CommandName 'my-app' -ScriptBlock {
6    param($wordToComplete, $commandAst, $cursorPosition)
7
8    $commandElements = $commandAst.CommandElements
9    $command = @(
10        'my-app'
11        for ($i = 1; $i -lt $commandElements.Count; $i++) {
12            $element = $commandElements[$i]
13            if ($element -isnot [StringConstantExpressionAst] -or
14                $element.StringConstantType -ne [StringConstantType]::BareWord -or
15                $element.Value.StartsWith('-') -or
16                $element.Value -eq $wordToComplete) {
17                break
18        }
19        $element.Value
20    }) -join ';'
21
22    $completions = @(switch ($command) {
23        'my-app' {
24            [CompletionResult]::new('-c', 'c', [CompletionResultType]::ParameterName, 'some config file')
25            [CompletionResult]::new('-C', 'C', [CompletionResultType]::ParameterName, 'some config file')
26            [CompletionResult]::new('--config', 'config', [CompletionResultType]::ParameterName, 'some config file')
27            [CompletionResult]::new('--conf', 'conf', [CompletionResultType]::ParameterName, 'some config file')
28            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
29            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
30            [CompletionResult]::new('-V', 'V', [CompletionResultType]::ParameterName, 'Print version')
31            [CompletionResult]::new('--version', 'version', [CompletionResultType]::ParameterName, 'Print version')
32            [CompletionResult]::new('test', 'test', [CompletionResultType]::ParameterValue, 'tests things')
33            [CompletionResult]::new('some_cmd', 'some_cmd', [CompletionResultType]::ParameterValue, 'tests other things')
34            [CompletionResult]::new('some-cmd-with-hyphens', 'some-cmd-with-hyphens', [CompletionResultType]::ParameterValue, 'some-cmd-with-hyphens')
35            [CompletionResult]::new('some-hidden-cmd', 'some-hidden-cmd', [CompletionResultType]::ParameterValue, 'some-hidden-cmd')
36            [CompletionResult]::new('help', 'help', [CompletionResultType]::ParameterValue, 'Print this message or the help of the given subcommand(s)')
37            break
38        }
39        'my-app;test' {
40            [CompletionResult]::new('--case', 'case', [CompletionResultType]::ParameterName, 'the case to test')
41            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
42            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
43            [CompletionResult]::new('-V', 'V', [CompletionResultType]::ParameterName, 'Print version')
44            [CompletionResult]::new('--version', 'version', [CompletionResultType]::ParameterName, 'Print version')
45            break
46        }
47        'my-app;some_cmd' {
48            [CompletionResult]::new('--config', 'config', [CompletionResultType]::ParameterName, 'the other case to test')
49            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
50            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
51            [CompletionResult]::new('-V', 'V', [CompletionResultType]::ParameterName, 'Print version')
52            [CompletionResult]::new('--version', 'version', [CompletionResultType]::ParameterName, 'Print version')
53            break
54        }
55        'my-app;some-cmd-with-hyphens' {
56            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
57            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
58            [CompletionResult]::new('-V', 'V', [CompletionResultType]::ParameterName, 'Print version')
59            [CompletionResult]::new('--version', 'version', [CompletionResultType]::ParameterName, 'Print version')
60            break
61        }
62        'my-app;some-hidden-cmd' {
63            [CompletionResult]::new('-h', 'h', [CompletionResultType]::ParameterName, 'Print help')
64            [CompletionResult]::new('--help', 'help', [CompletionResultType]::ParameterName, 'Print help')
65            [CompletionResult]::new('-V', 'V', [CompletionResultType]::ParameterName, 'Print version')
66            [CompletionResult]::new('--version', 'version', [CompletionResultType]::ParameterName, 'Print version')
67            break
68        }
69        'my-app;help' {
70            [CompletionResult]::new('test', 'test', [CompletionResultType]::ParameterValue, 'tests things')
71            [CompletionResult]::new('some_cmd', 'some_cmd', [CompletionResultType]::ParameterValue, 'tests other things')
72            [CompletionResult]::new('some-cmd-with-hyphens', 'some-cmd-with-hyphens', [CompletionResultType]::ParameterValue, 'some-cmd-with-hyphens')
73            [CompletionResult]::new('some-hidden-cmd', 'some-hidden-cmd', [CompletionResultType]::ParameterValue, 'some-hidden-cmd')
74            [CompletionResult]::new('help', 'help', [CompletionResultType]::ParameterValue, 'Print this message or the help of the given subcommand(s)')
75            break
76        }
77        'my-app;help;test' {
78            break
79        }
80        'my-app;help;some_cmd' {
81            break
82        }
83        'my-app;help;some-cmd-with-hyphens' {
84            break
85        }
86        'my-app;help;some-hidden-cmd' {
87            break
88        }
89        'my-app;help;help' {
90            break
91        }
92    })
93
94    $completions.Where{ $_.CompletionText -like "$wordToComplete*" } |
95        Sort-Object -Property ListItemText
96}
97