zshrs 0.11.18

The first compiled Unix shell — bytecode VM, worker pool, AOP intercept, Rkyv caching
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131

//! Port of `_history` from `Completion/Base/Completer/_history`.
//!
//! Full upstream body (65 lines, abridged):
//! ```text
//! sh: 1  #autoload
//! sh:19  local opt expl max slice hmax=$#historywords beg=2
//! sh:21  if zstyle -t … remove-all-dups; then opt=-  else opt=-1  fi
//! sh:27  if zstyle -t … sort; then opt+=J else opt+=V fi
//! sh:33  if zstyle -s … range max; then …
//! sh:42  PREFIX="$IPREFIX$PREFIX"
//! sh:44  SUFFIX="$SUFFIX$ISUFFIX"
//! sh:50  while [[ $compstate[nmatches] -eq 0 && beg -lt max ]]; do
//! sh:52    if [[ -n $compstate[quote] ]]
//! sh:53    then hslice=( ${(Q)historywords[beg,beg+slice]} )
//! sh:54    else hslice=( ${historywords[beg,beg+slice]} )
//! sh:55    fi
//! sh:56    _wanted "$opt" history-words expl 'history word' \
//! sh:57        compadd -Q -a hslice
//! sh:58    (( beg+=slice ))
//! sh:59  done
//! sh:61  (( $compstate[nmatches] ))
//! ```

use crate::compsys::ported::_wanted::_wanted;
use crate::ported::modules::zutil::{lookupstyle, testforstyle};
use crate::ported::params::{getaparam, getsparam, setaparam, setsparam};
use crate::ported::zle::compcore::get_compstate_str;

/// `_history` — complete from `$historywords` array.
pub fn _history() -> i32 {
    let historywords = getaparam("historywords").unwrap_or_default();
    let hmax = historywords.len();
    let mut beg = 2usize;

    let curcontext = getsparam("curcontext").unwrap_or_default();
    let ctx = format!(":completion:{}:", curcontext);

    // sh:21
    let remove_all_dups = testforstyle(&ctx, "remove-all-dups") == 0;
    let opt_prefix = if remove_all_dups { "-" } else { "-1" };
    // sh:27
    let sort_on = testforstyle(&ctx, "sort") == 0;
    let opt = if sort_on {
        format!("{}J", opt_prefix)
    } else {
        format!("{}V", opt_prefix)
    };

    // sh:33-40  range style
    let range_val = lookupstyle(&ctx, "range")
        .first()
        .cloned()
        .unwrap_or_default();
    let (mut max, slice): (usize, usize) = if !range_val.is_empty() {
        let (m_str, s_str) = if range_val.contains(':') {
            let mut parts = range_val.splitn(2, ':');
            let m = parts.next().unwrap_or("0").to_string();
            let s = parts.next().unwrap_or("0").to_string();
            (m, s)
        } else {
            (range_val.clone(), range_val)
        };
        let m = m_str.parse::<usize>().unwrap_or(hmax);
        let s = s_str.parse::<usize>().unwrap_or(m);
        (m.min(hmax), s)
    } else {
        (hmax, hmax)
    };
    if max > hmax {
        max = hmax;
    }

    // sh:42-46  flatten quoted/unquoted PREFIX/IPREFIX semantics
    let prefix = getsparam("PREFIX").unwrap_or_default();
    let iprefix = getsparam("IPREFIX").unwrap_or_default();
    let _ = setsparam("PREFIX", &format!("{}{}", iprefix, prefix));
    let _ = setsparam("IPREFIX", "");
    let suffix = getsparam("SUFFIX").unwrap_or_default();
    let isuffix = getsparam("ISUFFIX").unwrap_or_default();
    let _ = setsparam("SUFFIX", &format!("{}{}", suffix, isuffix));
    let _ = setsparam("ISUFFIX", "");

    // sh:50-59  walk slices until nmatches > 0 or beg >= max.
    while get_compstate_str("nmatches").and_then(|s| s.parse::<i64>().ok()) == Some(0)
        && beg < max
    {
        let end = (beg + slice).min(hmax);
        let hslice: Vec<String> = if beg <= end && beg >= 1 && end <= historywords.len() {
            historywords[beg - 1..end].to_vec()
        } else {
            Vec::new()
        };
        setaparam("hslice", hslice);
        let _ = _wanted(&[
            opt.clone(),
            "history-words".to_string(),
            "expl".to_string(),
            "history word".to_string(),
            "compadd".to_string(),
            "-Q".to_string(),
            "-a".to_string(),
            "hslice".to_string(),
        ]);
        beg += slice;
        if slice == 0 {
            break;
        }
    }

    // sh:61
    let nm: i64 = get_compstate_str("nmatches")
        .and_then(|s| s.parse().ok())
        .unwrap_or(0);
    if nm == 0 {
        1
    } else {
        0
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn empty_historywords_returns_one() {
        let _g = crate::test_util::global_state_lock();
        setaparam("historywords", Vec::new());
        assert_eq!(_history(), 1);
    }
}