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feat(completions/ARRAY): add _comp_xfunc_ARRAY_filter
Co-authored-by: Christoph Anton Mitterer <[email protected]>
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‎completions/ARRAY‎

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# Utility xfunc functions for array manipulations -*- shell-script -*-
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# Filter the array elements with the specified condition.
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# @param $1 Array name (that is not "value" or other internal variable names)
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# @param $2 When any of the options `-EFG' is specified, the second argument is
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# used as a pattern string whose meaning is determined by the option `-EFG'.
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# Otherwise, the second argument specifies the command that tests the array
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# element. The command is supposed to exit with:
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#
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# status 0 .... when the element should be preserved
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# status 1 .... when the element should be removed
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# status 2 .... when the usage of the predicate is wrong
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# status 27 ... when the loop should be canceled. All the remaining
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# elements will be preserved regardless of the presence of
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# option `-r'.
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#
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# The other exit statuses are reserved and cancel the array filtering with an
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# error message, and the function returns with the exit status 2. If this is
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# an existing command name, the command is called with the value of the array
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# element being specified as the first command argument. Otherwise, this
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# shall be a shell command that tests the array-element value stored in the
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# environment variable "value".
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#
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# Options:
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#
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# The following options specify the type of the pattern. When mutiple
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# options are supplied, the last-specified one overwrite the previous
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# option.
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#
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# -E $2 is interpreted as a POSIX extended regular expression.
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# The default anchoring is `-m` (see below).
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# -F $2 is interpreted as a fixed string. The default anchoring
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# is `-m` (see below).
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# -G $2 is interpreted as a glob pattern. The default anchoring
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# is `-x` (see below).
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#
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# Combined with any of -EFG, the following options specify the anchoring
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# type of the pattern matching. When multiple options are supplied, the
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# last-specified one overwrites the previous option.
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#
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# -p performs the prefix matching.
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# -s performs the suffix matching.
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# -m performs the middle matching.
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# -x performs the exact matching.
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#
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# -r Revert the condition, i.e., remove elements that satisfy
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# the original condition.
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# -C Array compaction is not performed.
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#
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# @return 2 with a wrong usage, 1 when any elements are removed, 0 when the set
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# of array elements are unchanged. [ Note: the compaction will be performed
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# (without the option -C) even when the set of array elements are
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# unchanged. ]
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_comp_xfunc_ARRAY_filter()
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{
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local _comp_local_flags='' _comp_local_pattype='' _comp_local_anchoring=''
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local OPTIND=1 OPTARG='' OPTERR=0 _comp_local_opt=''
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while getopts 'EFGpsmxrC' _comp_local_opt "$@"; do
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case $_comp_local_opt in
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[EFG]) _comp_local_pattype=$_comp_local_opt ;;
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[psmx]) _comp_local_anchoring=$_comp_local_opt ;;
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[rC]) _comp_local_flags=$_comp_local_opt$_comp_local_flags ;;
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*)
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printf 'bash_completion: %s: %s\n' "$FUNCNAME" 'usage error' >&2
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printf 'usage: %s %s\n' "$FUNCNAME" "[-EFGpsmxrC] ARRAY_NAME CONDITION" >&2
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return 2
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;;
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esac
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done
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shift "$((OPTIND - 1))"
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if (($# != 2)); then
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printf 'bash_completion: %s: %s\n' "$FUNCNAME" "unexpected number of arguments: $#" >&2
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printf 'usage: %s %s\n' "$FUNCNAME" "[-EFGpsmxrC] ARRAY_NAME CONDITION" >&2
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return 2
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elif [[ $1 != [a-zA-Z_]*([a-zA-Z_0-9]) ]]; then
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printf 'bash_completion: %s: %s\n' "$FUNCNAME" "invalid array name '$1'." >&2
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return 2
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elif [[ $1 == @(_comp_local_*|OPTIND|OPTARG|OPTERR) ]]; then
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printf 'bash_completion: %s: %s\n' "$FUNCNAME" "array name '$1' is reserved for internal uses" >&2
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return 2
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elif [[ ! $_comp_local_pattype && $1 == value ]]; then
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printf 'bash_completion: %s: %s\n' "$FUNCNAME" "array name '$1' cannot be used for the predicate" >&2
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return 2
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fi
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# When the array is empty:
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eval "((\${#$1[@]}))" || return 0
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local _comp_local_predicate='' _comp_local_pattern=$2
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case $_comp_local_pattype in
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E)
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case $_comp_local_anchoring in
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p) _comp_local_predicate='[[ $_comp_local_value =~ ^($_comp_local_pattern) ]]' ;;
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s) _comp_local_predicate='[[ $_comp_local_value =~ ($_comp_local_pattern)$ ]]' ;;
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x) _comp_local_predicate='[[ $_comp_local_value =~ ^($_comp_local_pattern)$ ]]' ;;
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*) _comp_local_predicate='[[ $_comp_local_value =~ $_comp_local_pattern ]]' ;;
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esac
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;;
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F)
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case $_comp_local_anchoring in
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p) _comp_local_predicate='[[ $_comp_local_value == "$_comp_local_pattern"* ]]' ;;
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s) _comp_local_predicate='[[ $_comp_local_value == *"$_comp_local_pattern" ]]' ;;
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x) _comp_local_predicate='[[ $_comp_local_value == "$_comp_local_pattern" ]]' ;;
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*) _comp_local_predicate='[[ $_comp_local_value == *"$_comp_local_pattern"* ]]' ;;
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esac
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;;
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G)
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case $_comp_local_anchoring in
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p) _comp_local_predicate='[[ $_comp_local_value == $_comp_local_pattern* ]]' ;;
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s) _comp_local_predicate='[[ $_comp_local_value == *$_comp_local_pattern ]]' ;;
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m) _comp_local_predicate='[[ $_comp_local_value == *$_comp_local_pattern* ]]' ;;
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*) _comp_local_predicate='[[ $_comp_local_value == $_comp_local_pattern ]]' ;;
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esac
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;;
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*)
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if type -t "$2" &>/dev/null; then
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_comp_local_predicate="$2 \"\$_comp_local_value\""
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else
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_comp_local_predicate="local -x value=\$_comp_local_value; $2"
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fi
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;;
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esac
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local _comp_local_unset='' _comp_local_expected_status=0
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[[ $_comp_local_flags == *r* ]] && _comp_local_expected_status=1
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local _comp_local_indices _comp_local_index _comp_local_value
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eval "_comp_local_indices=(\"\${!$1[@]}\")"
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for _comp_local_index in "${_comp_local_indices[@]}"; do
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eval "_comp_local_value=\${$1[\$_comp_local_index]}; $_comp_local_predicate"
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case $? in
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"$_comp_local_expected_status") continue ;;
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[01])
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unset -v "$1[\$_comp_local_index]"
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_comp_local_unset=1
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;;
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27) break ;;
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*)
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printf 'bash_completion: %s: %s\n' "$FUNCNAME" \
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"filter condition broken '${_comp_local_pattype:+-$_comp_local_pattype }$2'" >&2
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return 2
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;;
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esac
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done
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# Compaction of the sparse array
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[[ $_comp_local_flags == *C* ]] ||
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eval "((\${#$1[@]})) && $1=(\"\${$1[@]}\")"
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[[ ! $_comp_local_unset ]]
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}

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