Command Line Flags in Scilab

Here’s the translation of the Go code to Scilab, along with explanations in Markdown format suitable for Hugo:

// Command-line flags are a common way to specify options for command-line
// programs. For example, in `wc -l` the `-l` is a command-line flag.

// Scilab doesn't have a built-in package for parsing command-line arguments
// like Go's `flag` package. However, we can use the `argv()` function to
// access command-line arguments and implement a simple parsing mechanism.

function [value] = getOption(args, name, default)
    for i = 1:length(args)
        if strindex(args(i), name + "=") == 1 then
            value = part(args(i), length(name + "=") + 1:length(args(i)))
            return
        end
    end
    value = default
endfunction

function main()
    args = argv()
    
    // Declare and parse command-line flags
    word = getOption(args, "--word", "foo")
    numb = strtod(getOption(args, "--numb", "42"))
    fork = getOption(args, "--fork", "false") == "true"
    svar = getOption(args, "--svar", "bar")
    
    // Print the parsed flags
    mprintf("word: %s\n", word)
    mprintf("numb: %d\n", numb)
    mprintf("fork: %s\n", string(fork))
    mprintf("svar: %s\n", svar)
    
    // Print any remaining arguments
    tail = []
    for i = 1:length(args)
        if ~strindex(args(i), "--") == 1 then
            tail = [tail args(i)]
        end
    end
    mprintf("tail: ")
    disp(tail)
end

main()

To experiment with the command-line flags program, save it to a file (e.g., command_line_flags.sce) and run it using the Scilab interpreter:

$ scilab -nw -f command_line_flags.sce -- --word=opt --numb=7 --fork=true --svar=flag
word: opt
numb: 7
fork: true
svar: flag
tail: []

Note that if you omit flags, they automatically take their default values:

$ scilab -nw -f command_line_flags.sce -- --word=opt
word: opt
numb: 42
fork: false
svar: bar
tail: []

Trailing positional arguments can be provided after any flags:

$ scilab -nw -f command_line_flags.sce -- --word=opt a1 a2 a3
word: opt
numb: 42
fork: false
svar: bar
tail: ["a1", "a2", "a3"]

This Scilab implementation provides a basic command-line flag parsing functionality. However, it’s important to note that Scilab doesn’t have a built-in package for sophisticated command-line argument parsing like Go’s flag package. For more complex command-line interfaces in Scilab, you might need to implement a more robust parsing mechanism or use external libraries.

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Command Line Flags in Scilab