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// Std
#[allow(deprecated, unused_imports)]
use std::{ascii::AsciiExt, io::Write};
// Internal
use crate::{
app::{parser::Parser, App},
args::{AnyArg, ArgSettings},
completions, INTERNAL_ERROR_MSG,
};
pub struct ZshGen<'a, 'b>
where
'a: 'b,
{
p: &'b Parser<'a, 'b>,
}
impl<'a, 'b> ZshGen<'a, 'b> {
pub fn new(p: &'b Parser<'a, 'b>) -> Self {
debugln!("ZshGen::new;");
ZshGen { p }
}
pub fn generate_to<W: Write>(&self, buf: &mut W) {
debugln!("ZshGen::generate_to;");
w!(
buf,
format!(
"\
#compdef {name}
autoload -U is-at-least
_{name}() {{
typeset -A opt_args
typeset -a _arguments_options
local ret=1
if is-at-least 5.2; then
_arguments_options=(-s -S -C)
else
_arguments_options=(-s -C)
fi
local context curcontext=\"$curcontext\" state line
{initial_args}
{subcommands}
}}
{subcommand_details}
_{name} \"$@\"",
name = self.p.meta.bin_name.as_ref().unwrap(),
initial_args = get_args_of(self.p),
subcommands = get_subcommands_of(self.p),
subcommand_details = subcommand_details(self.p)
)
.as_bytes()
);
}
}
// Displays the commands of a subcommand
// (( $+functions[_[bin_name_underscore]_commands] )) ||
// _[bin_name_underscore]_commands() {
// local commands; commands=(
// '[arg_name]:[arg_help]'
// )
// _describe -t commands '[bin_name] commands' commands "$@"
//
// Where the following variables are present:
// [bin_name_underscore]: The full space delineated bin_name, where spaces have been replaced by
// underscore characters
// [arg_name]: The name of the subcommand
// [arg_help]: The help message of the subcommand
// [bin_name]: The full space delineated bin_name
//
// Here's a snippet from rustup:
//
// (( $+functions[_rustup_commands] )) ||
// _rustup_commands() {
// local commands; commands=(
// 'show:Show the active and installed toolchains'
// 'update:Update Rust toolchains'
// # ... snip for brevity
// 'help:Prints this message or the help of the given subcommand(s)'
// )
// _describe -t commands 'rustup commands' commands "$@"
//
fn subcommand_details(p: &Parser) -> String {
debugln!("ZshGen::subcommand_details;");
// First we do ourself
let mut ret = vec![format!(
"\
(( $+functions[_{bin_name_underscore}_commands] )) ||
_{bin_name_underscore}_commands() {{
local commands; commands=(
{subcommands_and_args}
)
_describe -t commands '{bin_name} commands' commands \"$@\"
}}",
bin_name_underscore = p.meta.bin_name.as_ref().unwrap().replace(" ", "__"),
bin_name = p.meta.bin_name.as_ref().unwrap(),
subcommands_and_args = subcommands_of(p)
)];
// Next we start looping through all the children, grandchildren, etc.
let mut all_subcommands = completions::all_subcommands(p);
all_subcommands.sort();
all_subcommands.dedup();
for &(_, ref bin_name) in &all_subcommands {
debugln!("ZshGen::subcommand_details:iter: bin_name={}", bin_name);
ret.push(format!(
"\
(( $+functions[_{bin_name_underscore}_commands] )) ||
_{bin_name_underscore}_commands() {{
local commands; commands=(
{subcommands_and_args}
)
_describe -t commands '{bin_name} commands' commands \"$@\"
}}",
bin_name_underscore = bin_name.replace(" ", "__"),
bin_name = bin_name,
subcommands_and_args = subcommands_of(parser_of(p, bin_name))
));
}
ret.join("\n")
}
// Generates subcommand completions in form of
//
// '[arg_name]:[arg_help]'
//
// Where:
// [arg_name]: the subcommand's name
// [arg_help]: the help message of the subcommand
//
// A snippet from rustup:
// 'show:Show the active and installed toolchains'
// 'update:Update Rust toolchains'
fn subcommands_of(p: &Parser) -> String {
debugln!("ZshGen::subcommands_of;");
let mut ret = vec![];
fn add_sc(sc: &App, n: &str, ret: &mut Vec<String>) {
debugln!("ZshGen::add_sc;");
let s = format!(
"\"{name}:{help}\" \\",
name = n,
help =
sc.p.meta
.about
.unwrap_or("")
.replace("[", "\\[")
.replace("]", "\\]")
);
if !s.is_empty() {
ret.push(s);
}
}
// The subcommands
for sc in p.subcommands() {
debugln!("ZshGen::subcommands_of:iter: subcommand={}", sc.p.meta.name);
add_sc(sc, &sc.p.meta.name, &mut ret);
if let Some(ref v) = sc.p.meta.aliases {
for alias in v.iter().filter(|&&(_, vis)| vis).map(|&(n, _)| n) {
add_sc(sc, alias, &mut ret);
}
}
}
ret.join("\n")
}
// Get's the subcommand section of a completion file
// This looks roughly like:
//
// case $state in
// ([bin_name]_args)
// curcontext=\"${curcontext%:*:*}:[name_hyphen]-command-$words[1]:\"
// case $line[1] in
//
// ([name])
// _arguments -C -s -S \
// [subcommand_args]
// && ret=0
//
// [RECURSIVE_CALLS]
//
// ;;",
//
// [repeat]
//
// esac
// ;;
// esac",
//
// Where the following variables are present:
// [name] = The subcommand name in the form of "install" for "rustup toolchain install"
// [bin_name] = The full space delineated bin_name such as "rustup toolchain install"
// [name_hyphen] = The full space delineated bin_name, but replace spaces with hyphens
// [repeat] = From the same recursive calls, but for all subcommands
// [subcommand_args] = The same as zsh::get_args_of
fn get_subcommands_of(p: &Parser) -> String {
debugln!("get_subcommands_of;");
debugln!(
"get_subcommands_of: Has subcommands...{:?}",
p.has_subcommands()
);
if !p.has_subcommands() {
return String::new();
}
let sc_names = completions::subcommands_of(p);
let mut subcmds = vec![];
for &(ref name, ref bin_name) in &sc_names {
let mut v = vec![format!("({})", name)];
let subcommand_args = get_args_of(parser_of(p, &*bin_name));
if !subcommand_args.is_empty() {
v.push(subcommand_args);
}
let subcommands = get_subcommands_of(parser_of(p, &*bin_name));
if !subcommands.is_empty() {
v.push(subcommands);
}
v.push(String::from(";;"));
subcmds.push(v.join("\n"));
}
format!(
"case $state in
({name})
words=($line[{pos}] \"${{words[@]}}\")
(( CURRENT += 1 ))
curcontext=\"${{curcontext%:*:*}}:{name_hyphen}-command-$line[{pos}]:\"
case $line[{pos}] in
{subcommands}
esac
;;
esac",
name = p.meta.name,
name_hyphen = p.meta.bin_name.as_ref().unwrap().replace(" ", "-"),
subcommands = subcmds.join("\n"),
pos = p.positionals().len() + 1
)
}
fn parser_of<'a, 'b>(p: &'b Parser<'a, 'b>, sc: &str) -> &'b Parser<'a, 'b> {
debugln!("parser_of: sc={}", sc);
if sc == p.meta.bin_name.as_ref().unwrap_or(&String::new()) {
return p;
}
&p.find_subcommand(sc).expect(INTERNAL_ERROR_MSG).p
}
// Writes out the args section, which ends up being the flags, opts and postionals, and a jump to
// another ZSH function if there are subcommands.
// The structer works like this:
// ([conflicting_args]) [multiple] arg [takes_value] [[help]] [: :(possible_values)]
// ^-- list '-v -h' ^--'*' ^--'+' ^-- list 'one two three'
//
// An example from the rustup command:
//
// _arguments -C -s -S \
// '(-h --help --verbose)-v[Enable verbose output]' \
// '(-V -v --version --verbose --help)-h[Prints help information]' \
// # ... snip for brevity
// ':: :_rustup_commands' \ # <-- displays subcommands
// '*::: :->rustup' \ # <-- displays subcommand args and child subcommands
// && ret=0
//
// The args used for _arguments are as follows:
// -C: modify the $context internal variable
// -s: Allow stacking of short args (i.e. -a -b -c => -abc)
// -S: Do not complete anything after '--' and treat those as argument values
fn get_args_of(p: &Parser) -> String {
debugln!("get_args_of;");
let mut ret = vec![String::from("_arguments \"${_arguments_options[@]}\" \\")];
let opts = write_opts_of(p);
let flags = write_flags_of(p);
let positionals = write_positionals_of(p);
let sc_or_a = if p.has_subcommands() {
format!(
"\":: :_{name}_commands\" \\",
name = p.meta.bin_name.as_ref().unwrap().replace(" ", "__")
)
} else {
String::new()
};
let sc = if p.has_subcommands() {
format!("\"*::: :->{name}\" \\", name = p.meta.name)
} else {
String::new()
};
if !opts.is_empty() {
ret.push(opts);
}
if !flags.is_empty() {
ret.push(flags);
}
if !positionals.is_empty() {
ret.push(positionals);
}
if !sc_or_a.is_empty() {
ret.push(sc_or_a);
}
if !sc.is_empty() {
ret.push(sc);
}
ret.push(String::from("&& ret=0"));
ret.join("\n")
}
// Escape help string inside single quotes and brackets
fn escape_help(string: &str) -> String {
string
.replace("\\", "\\\\")
.replace("'", "'\\''")
.replace("[", "\\[")
.replace("]", "\\]")
}
// Escape value string inside single quotes and parentheses
fn escape_value(string: &str) -> String {
string
.replace("\\", "\\\\")
.replace("'", "'\\''")
.replace("(", "\\(")
.replace(")", "\\)")
.replace(" ", "\\ ")
}
fn write_opts_of(p: &Parser) -> String {
debugln!("write_opts_of;");
let mut ret = vec![];
for o in p.opts() {
debugln!("write_opts_of:iter: o={}", o.name());
let help = o.help().map_or(String::new(), escape_help);
let mut conflicts = get_zsh_arg_conflicts!(p, o, INTERNAL_ERROR_MSG);
conflicts = if conflicts.is_empty() {
String::new()
} else {
format!("({})", conflicts)
};
let multiple = if o.is_set(ArgSettings::Multiple) {
"*"
} else {
""
};
let pv = if let Some(pv_vec) = o.possible_vals() {
format!(
": :({})",
pv_vec
.iter()
.map(|v| escape_value(*v))
.collect::<Vec<String>>()
.join(" ")
)
} else {
String::new()
};
if let Some(short) = o.short() {
let s = format!(
"'{conflicts}{multiple}-{arg}+[{help}]{possible_values}' \\",
conflicts = conflicts,
multiple = multiple,
arg = short,
possible_values = pv,
help = help
);
debugln!("write_opts_of:iter: Wrote...{}", &*s);
ret.push(s);
}
if let Some(long) = o.long() {
let l = format!(
"'{conflicts}{multiple}--{arg}=[{help}]{possible_values}' \\",
conflicts = conflicts,
multiple = multiple,
arg = long,
possible_values = pv,
help = help
);
debugln!("write_opts_of:iter: Wrote...{}", &*l);
ret.push(l);
}
}
ret.join("\n")
}
fn write_flags_of(p: &Parser) -> String {
debugln!("write_flags_of;");
let mut ret = vec![];
for f in p.flags() {
debugln!("write_flags_of:iter: f={}", f.name());
let help = f.help().map_or(String::new(), escape_help);
let mut conflicts = get_zsh_arg_conflicts!(p, f, INTERNAL_ERROR_MSG);
conflicts = if conflicts.is_empty() {
String::new()
} else {
format!("({})", conflicts)
};
let multiple = if f.is_set(ArgSettings::Multiple) {
"*"
} else {
""
};
if let Some(short) = f.short() {
let s = format!(
"'{conflicts}{multiple}-{arg}[{help}]' \\",
multiple = multiple,
conflicts = conflicts,
arg = short,
help = help
);
debugln!("write_flags_of:iter: Wrote...{}", &*s);
ret.push(s);
}
if let Some(long) = f.long() {
let l = format!(
"'{conflicts}{multiple}--{arg}[{help}]' \\",
conflicts = conflicts,
multiple = multiple,
arg = long,
help = help
);
debugln!("write_flags_of:iter: Wrote...{}", &*l);
ret.push(l);
}
}
ret.join("\n")
}
fn write_positionals_of(p: &Parser) -> String {
debugln!("write_positionals_of;");
let mut ret = vec![];
for arg in p.positionals() {
debugln!("write_positionals_of:iter: arg={}", arg.b.name);
let a = format!(
"'{optional}:{name}{help}:{action}' \\",
optional = if !arg.b.is_set(ArgSettings::Required) {
":"
} else {
""
},
name = arg.b.name,
help = arg
.b
.help
.map_or("".to_owned(), |v| " -- ".to_owned() + v)
.replace("[", "\\[")
.replace("]", "\\]"),
action = arg.possible_vals().map_or("_files".to_owned(), |values| {
format!(
"({})",
values
.iter()
.map(|v| escape_value(*v))
.collect::<Vec<String>>()
.join(" ")
)
})
);
debugln!("write_positionals_of:iter: Wrote...{}", a);
ret.push(a);
}
ret.join("\n")
}