fisher/man/man1/getopts.1

.\" generated with Ronn/v0.7.3
.\" http://github.com/rtomayko/ronn/tree/0.7.3
.
.TH "GETOPTS" "1" "January 2016" "" "fisherman"
.
.SH "NAME"
\fBgetopts\fR \- Parse CLI options
.
.SH "SYNOPSIS"
\fBgetopts\fR [\fIoptions\fR \.\.\.]
.
.br
\fBgetopts\fR [\fIoptions\fR \.\.\.] \fB|\fR \fBwhile\fR read \-l key value; \.\.\.; \fBend\fR
.
.br
.
.SH "DESCRIPTION"
getopts is a command line parser, designed to process command line arguments based in the POSIX Utility Syntax Guidelines\. If no arguments are given getopts returns \fB1\fR\.
.
.SH "USAGE"
In the following example:
.
.IP "" 4
.
.nf

getopts \-ab1 \-\-foo=bar baz
.
.fi
.
.IP "" 0
.
.P
And its output:
.
.IP "" 4
.
.nf

a
b    1
foo  bar
_    baz
.
.fi
.
.IP "" 0
.
.P
The items on the left represent the option flags or \fIkeys\fR associated with the CLI\. The items on the right are the option \fIvalues\fR\. The underscore \fB_\fR character is the default \fIkey\fR for arguments without a key\.
.
.P
Use \fBread(1)\fR to process the generated stream and \fBswitch(1)\fR to match patterns:
.
.IP "" 4
.
.nf

getopts \-ab1 \-\-foo=bar baz | while read \-l key option
    switch $key
        case _
        case a
        case b
        case foo
    end
end
.
.fi
.
.IP "" 0
.
.SH "OPTIONS"
None\.
.
.SH "EXAMPLES"
The following is a mock of \fBfish(1)\fR CLI missing the implementation:
.
.IP "" 4
.
.nf

function fish
    set \-l mode
    set \-l flags
    set \-l commands
    set \-l debug_level

    getopts $argv | while read \-l key value
        switch $key
            case c command
                set commands $commands $value

            case d debug\-level
                set debug_level $value

            case i interactive
                set mode $value

            case l login
                set mode $value

            case n no\-execute
                set mode $value

            case p profile
                set flags $flags $value

            case h help
                printf "usage: $_ [OPTIONS] [\-c command] [FILE [ARGUMENTS\.\.\.]]\en"
                return

            case \e*
                printf "$_: \'%s\' is not a valid option\.\en" $key
                return 1
        end
    end

    # Implementation
end
.
.fi
.
.IP "" 0
.
.SH "BUGS"
.
.IP "\(bu" 4
getopts does \fInot\fR read the standard input\. Use getopts to collect options and the standard input to process a stream of data relevant to your program\.
.
.IP "\(bu" 4
A double dash, \fB\-\-\fR, marks the end of options\. Arguments after this sequence are placed in the default underscore key, \fB_\fR\.
.
.IP "\(bu" 4
The getopts described in this document is \fInot\fR equivalent to the getopts \fIbuiltin\fR found in other shells\.
.
.IP "" 0
.
.SH "AUTHORS"
Jorge Bucaran \fIj@bucaran\.me\fR\.
.
.SH "SEE ALSO"
POSIX Utility Syntax Guidelines [goo\.gl/yrgQn9]
.
.br