Convert bash function to fish's [closed]

问题

Can someone help me convert this bash function to fish? It would also be nice if you could explain what these do like "${@%%.app}”, 's/ /.*/g’, "$@\” etc.

bid() {
    local shortname location

    # combine all args as regex
    # (and remove ".app" from the end if it exists due to autocomplete)
    shortname=$(echo "${@%%.app}"|sed 's/ /.*/g')
    # if the file is a full match in apps folder, roll with it
    if [ -d "/Applications/$shortname.app" ]; then
        location="/Applications/$shortname.app"
    else # otherwise, start searching
        location=$(mdfind -onlyin /Applications -onlyin ~/Applications -onlyin /Developer/Applications 'kMDItemKind==Application'|awk -F '/' -v re="$shortname" 'tolower($NF) ~ re {print $0}'|head -n1)
    fi
    # No results? Die.
    [[ -z $location || $location = "" ]] && echo "$1 not found, I quit" && return
    # Otherwise, find the bundleid using spotlight metadata
    bundleid=$(mdls -name kMDItemCFBundleIdentifier -r "$location")
    # return the result or an error message
    [[ -z $bundleid || $bundleid = "" ]] && echo "Error getting bundle ID for \"$@\"" || echo "$location: $bundleid”
}

Thanks very much in advance.

回答1:

Some notes on the differences:

setting variables
- bash: var=value
- fish: set var value
function arguments
- bash: "$@"
- fish: $argv
function local variables
- bash: local var
- fish: set -l var
conditionals I
- bash: [[ ... ]] and [ ... ]
- fish: test ...
conditionals II
- bash: if cond; then cmds; fi
- fish: if cond; cmds; end
conditionals III
- bash: cmd1 && cmd2
- fish: cmd1; and cmd2
- fish (as of fish 3.0): cmd1 && cmd2
command substitution
- bash: output=$(pipeline)
- fish: set output (pipeline)
process substitution
- bash: join <(sort file1) <(sort file2)
- fish: join (sort file1 | psub) (sort file2 | psub)

Documentation

bash: https://www.gnu.org/software/bash/manual/bashref.html
fish: http://fishshell.com/docs/current/index.html

来源：https://stackoverflow.com/questions/29667714/convert-bash-function-to-fishs

标签

bash

shell

fish