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//! Port of `_pick_variant` from
//! `Completion/Base/Utility/_pick_variant`.
//!
//! Full upstream body (49 lines verbatim):
//! ```text
//! sh: 1 #autoload
//! sh: 7 zparseopts -D -A opts b: c: r:
//! sh: 8 : ${opts[-c]:=$words[1]}
//! sh:10 while [[ $1 = *=* ]]; do
//! sh:11 var+=( "${1%%\=*}" "${1#*=}" )
//! sh:12 shift
//! sh:13 done
//! sh:15 if (( ${#precommands:|builtin_precommands} )); then
//! sh:16 pre=command
//! sh:17 elif (( $+opts[-b] && (...) )); then
//! sh:21 return 0
//! sh:22 elif (( $precommands[(I)builtin] )); then
//! sh:23 pre=builtin
//! sh:24 else
//! sh:26 pre=
//! sh:27 fi
//! sh:30 if [[ $pre != builtin ]] && (( $+_cmd_variant[$opts[-c]] )); then
//! sh:31 (( $+opts[-r] )) && : ${(P)opts[-r]::=${_cmd_variant[$opts[-c]]}}
//! sh:32 [[ $_cmd_variant[$opts[-c]] = "$1" ]] && return 1
//! sh:33 return 0
//! sh:34 fi
//! sh:36 output="$(_call_program variant $pre $opts[-c] "${@[2,-1]}" </dev/null 2>&1)"
//! sh:38 for cmd pat in "$var[@]"; do
//! sh:39 if [[ $output = *$~pat* ]]; then
//! sh:40 (( $+opts[-r] )) && : ${(P)opts[-r]::=$cmd}
//! sh:41 _cmd_variant[$opts[-c]]="$cmd"
//! sh:42 return 0
//! sh:43 fi
//! sh:44 done
//! sh:47 return 1
//! ```
use crate::compsys::ported::_call_program::_call_program;
use crate::ported::modules::zutil::bin_zparseopts;
use crate::ported::params::{getaparam, getsparam, setaparam, setsparam};
use crate::ported::pattern::{patcompile, pattry};
use crate::ported::zsh_h::{options, MAX_OPS};
fn make_ops() -> options {
options {
ind: [0u8; MAX_OPS],
args: Vec::new(),
argscount: 0,
argsalloc: 0,
}
}
/// sh:7 — `zparseopts -D -A opts b: c: r:`. `-A` makes opts an
/// assoc; we use the flat key/value layout.
fn run_zparseopts_pick_variant(args: &[String]) -> (Vec<String>, Vec<String>) {
let src = "__compsys_argv";
setaparam(src, args.to_vec());
setaparam("opts_flat", Vec::new());
let _ = bin_zparseopts(
"zparseopts",
&[
"-D".to_string(),
"-v".to_string(),
src.to_string(),
"-a".to_string(),
"opts_flat".to_string(),
"b:".to_string(),
"c:".to_string(),
"r:".to_string(),
],
&make_ops(),
0,
);
let opts_flat = getaparam("opts_flat").unwrap_or_default();
let remaining = getaparam(src).unwrap_or_default();
// Tear down the `__compsys_argv` zparseopts-bridge scratch global (not a
// real zsh identifier; zsh operates on positional $argv). Bug #657.
crate::ported::params::unsetparam(src);
(remaining, opts_flat)
}
/// Look up `key` in a flat [k, v, k, v, ...] options array.
fn opt(opts_flat: &[String], key: &str) -> Option<String> {
let mut i = 0;
while i + 1 < opts_flat.len() {
if opts_flat[i] == key {
return Some(opts_flat[i + 1].clone());
}
i += 2;
}
None
}
/// `_pick_variant` — detect which variant of a command is installed
/// by running it (cached in `$_cmd_variant`) and matching its output
/// against caller-supplied `name=pattern` specs.
pub fn _pick_variant(args: &[String]) -> i32 {
// sh:7
let (argv, opts_flat) = run_zparseopts_pick_variant(args);
// sh:8 — opts[-c] defaults to $words[1]
let cmd_name = match opt(&opts_flat, "-c") {
Some(v) => v,
None => getaparam("words")
.unwrap_or_default()
.first()
.cloned()
.unwrap_or_default(),
};
// sh:10-13 — extract `name=pattern` pairs from argv head
let mut var: Vec<(String, String)> = Vec::new();
let mut argv = argv;
while let Some(first) = argv.first() {
if let Some(eq) = first.find('=') {
let (n, p) = first.split_at(eq);
var.push((n.to_string(), p[1..].to_string()));
argv.remove(0);
} else {
break;
}
}
// sh:30 cached?
let cmd_variant_arr = getaparam("_cmd_variant").unwrap_or_default();
let cached: Option<String> = cmd_variant_arr
.chunks(2)
.find(|kv| kv.first().map(|k| k == &cmd_name).unwrap_or(false))
.and_then(|kv| kv.get(1).cloned());
if let Some(cached_v) = cached {
if let Some(r) = opt(&opts_flat, "-r") {
let _ = setsparam(&r, &cached_v);
}
let dflt = argv.first().cloned().unwrap_or_default();
if cached_v == dflt {
return 1;
}
return 0;
}
// sh:36 — `output="$(_call_program variant … "${@[2,-1]}" </dev/null 2>&1)"`.
// The shell captures the probe command's output with STDERR MERGED (`2>&1`)
// and stdin from /dev/null. Native `_call_program` publishes only the
// command's STDOUT to `$REPLY`, and native `_pick_variant` calls it directly
// (no `$(… 2>&1)` wrapper), so a probe that prints its usage/version to
// STDERR — e.g. `nc -h` (BSD netcat writes 86 lines to stderr, nothing to
// stdout) — yielded an EMPTY `$REPLY`, no pattern matched, and the DEFAULT
// (last) variant was picked: `nc <TAB>` completed `nedit` options
// (`-iconic`/`-line`/…) instead of netcat's `-b`/`-i`/`-l`. `_call_program`
// runs `sh -c <joined args>`, so append the redirects as command words to
// reproduce the `</dev/null 2>&1` the shell puts on the `$()`.
let mut call_args: Vec<String> = vec!["variant".to_string(), cmd_name.clone()];
if argv.len() > 1 {
call_args.extend(argv[1..].iter().cloned());
}
call_args.push("</dev/null".to_string());
call_args.push("2>&1".to_string());
let _ = _call_program(&call_args);
let output = getsparam("REPLY").unwrap_or_default();
// sh:38-43 — for each (name, pattern), test output match
for (name, pat) in &var {
// sh:39 — `if [[ $output = *$~pat* ]]`: the pattern is matched as a
// SUBSTRING (`*…*` on both sides), not anchored to the whole output.
// Without the wrapping `*`, `pattry` did a full-string match, so e.g.
// `grep (BSD grep, GNU compatible) 2.6.0-FreeBSD` never matched the
// `gpl2='(2.5.1|GNU compatible)'` spec → `_pick_variant` fell through
// to the `unix` default → wrong (reduced) option set for `grep`/etc.
let matched = match patcompile(
&{
let mut __pat_tok = format!("*{}*", pat);
crate::ported::glob::tokenize(&mut __pat_tok);
__pat_tok
},
0,
None,
) {
Some(prog) => pattry(&prog, &output),
None => output.contains(pat),
};
if matched {
if let Some(r) = opt(&opts_flat, "-r") {
let _ = setsparam(&r, name);
}
// Append to _cmd_variant
let mut arr = getaparam("_cmd_variant").unwrap_or_default();
arr.push(cmd_name.clone());
arr.push(name.clone());
setaparam("_cmd_variant", arr);
return 0;
}
}
// sh:46-47
let dflt = argv.first().cloned().unwrap_or_default();
if let Some(r) = opt(&opts_flat, "-r") {
let _ = setsparam(&r, &dflt);
}
let mut arr = getaparam("_cmd_variant").unwrap_or_default();
arr.push(cmd_name);
arr.push(dflt);
setaparam("_cmd_variant", arr);
1
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn no_args_returns_one() {
let _g = crate::test_util::global_state_lock();
setaparam("_cmd_variant", Vec::new());
assert_eq!(_pick_variant(&[]), 1);
}
}