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https://github.com/fish-shell/fish-shell
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f342ae6a1c
I've been needing this for some time to generate completions for functions that we can dynamically generate completions for that take one or more comma-separated values in any order.
44 lines
2 KiB
Fish
44 lines
2 KiB
Fish
# This function is intended to be used to generate completions in `-a "(...)"` calls for arguments that take 1..n values
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# separated by commas and we dynamically or statically generated a list of n values that must be combined and permuted
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# in order to appease both the `complete` machinery and the target application.
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#
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# TODO: Make this work with completions that have their description appended after a \t
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function __fish_concat_completions -d "Generate completions that are specified as comma-separated values from stdin source"
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type -q awk || return;
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set -l token (commandline -ct)
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# We want to filter out suggestions the user has already entered.
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set -l extant (string split -- ',' $token)
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set -l filter (printf '^%s$\n' (printf '%s\n' $extant | string escape --style=regex) | string join '|')
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# Work around the insanity of trying to read from stdin within a function. Note that we can't place the
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# `read` call in between () to capture the output because that breaks its connection to stdin.
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while read -l line;
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echo $line;
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end | string match -er '.' | string match -rv -- $filter | string replace -r '^' -- (string replace -rf '^(.+),.*$' '$1,' $token; or echo "")
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return
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# Verified compatible with bsd awk and gnu awk
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awk '
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{
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lines[NR-1] = $0
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}
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END {
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n = NR
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for (k = 1; k <= n; k++) {
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generate_permutations(lines, n, k)
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}
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}
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function generate_permutations(arr, total_len, perm_len, prefix, _i, _swap) {
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if (perm_len == 0) {
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print prefix
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return
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}
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for (_i = 0; _i < total_len; _i++) {
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_swap = arr[total_len-1]; arr[total_len-1] = arr[_i]; arr[_i] = _swap
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generate_permutations(arr, total_len-1, perm_len-1, prefix arr[total_len-1] (perm_len == 1 ? "" : ","))
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arr[_i] = arr[total_len-1]; arr[total_len-1] = _swap
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}
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}
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'
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end
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