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use std::io::Write;
use clap::builder::StyledStr;
use clap::*;
use crate::generator::{utils, Generator};
use crate::INTERNAL_ERROR_MSG;
/// Generate powershell completion file
#[derive(Copy, Clone, PartialEq, Eq, Debug)]
pub struct PowerShell;
impl Generator for PowerShell {
fn file_name(&self, name: &str) -> String {
format!("_{name}.ps1")
}
fn generate(&self, cmd: &Command, buf: &mut dyn Write) {
let bin_name = cmd
.get_bin_name()
.expect("crate::generate should have set the bin_name");
let subcommands_cases = generate_inner(cmd, "");
let result = format!(
r#"
using namespace System.Management.Automation
using namespace System.Management.Automation.Language
Register-ArgumentCompleter -Native -CommandName '{bin_name}' -ScriptBlock {{
param($wordToComplete, $commandAst, $cursorPosition)
$commandElements = $commandAst.CommandElements
$command = @(
'{bin_name}'
for ($i = 1; $i -lt $commandElements.Count; $i++) {{
$element = $commandElements[$i]
if ($element -isnot [StringConstantExpressionAst] -or
$element.StringConstantType -ne [StringConstantType]::BareWord -or
$element.Value.StartsWith('-') -or
$element.Value -eq $wordToComplete) {{
break
}}
$element.Value
}}) -join ';'
$completions = @(switch ($command) {{{subcommands_cases}
}})
$completions.Where{{ $_.CompletionText -like "$wordToComplete*" }} |
Sort-Object -Property ListItemText
}}
"#
);
w!(buf, result.as_bytes());
}
}
// Escape string inside single quotes
fn escape_string(string: &str) -> String {
string.replace('\'', "''")
}
fn get_tooltip<T: ToString>(help: Option<&StyledStr>, data: T) -> String {
match help {
Some(help) => escape_string(&help.to_string()),
_ => data.to_string(),
}
}
fn generate_inner(p: &Command, previous_command_name: &str) -> String {
debug!("generate_inner");
let command_name = if previous_command_name.is_empty() {
p.get_bin_name().expect(INTERNAL_ERROR_MSG).to_string()
} else {
format!("{};{}", previous_command_name, &p.get_name())
};
let mut completions = String::new();
let preamble = String::from("\n [CompletionResult]::new(");
for option in p.get_opts() {
generate_aliases(&mut completions, &preamble, option);
}
for flag in utils::flags(p) {
generate_aliases(&mut completions, &preamble, &flag);
}
for subcommand in p.get_subcommands() {
let data = &subcommand.get_name();
let tooltip = get_tooltip(subcommand.get_about(), data);
completions.push_str(&preamble);
completions.push_str(
format!("'{data}', '{data}', [CompletionResultType]::ParameterValue, '{tooltip}')")
.as_str(),
);
}
let mut subcommands_cases = format!(
r"
'{}' {{{}
break
}}",
&command_name, completions
);
for subcommand in p.get_subcommands() {
let subcommand_subcommands_cases = generate_inner(subcommand, &command_name);
subcommands_cases.push_str(&subcommand_subcommands_cases);
}
subcommands_cases
}
fn generate_aliases(completions: &mut String, preamble: &String, arg: &Arg) {
use std::fmt::Write as _;
if let Some(aliases) = arg.get_short_and_visible_aliases() {
let tooltip = get_tooltip(arg.get_help(), aliases[0]);
for alias in aliases {
let _ = write!(
completions,
"{preamble}'-{alias}', '{alias}{}', [CompletionResultType]::ParameterName, '{tooltip}')",
// make PowerShell realize there is a difference between `-s` and `-S`
if alias.is_uppercase() { " " } else { "" },
);
}
}
if let Some(aliases) = arg.get_long_and_visible_aliases() {
let tooltip = get_tooltip(arg.get_help(), aliases[0]);
for alias in aliases {
let _ = write!(
completions,
"{preamble}'--{alias}', '{alias}', [CompletionResultType]::ParameterName, '{tooltip}')"
);
}
}
}
|
