How to implement tab completion behaviour found in terminals?

This is a discussion on How to implement tab completion behaviour found in terminals? within the C++ Programming forums, part of the General Programming Boards category; Hello all! I'm doing a terminal app and wanted to add the feature of completing the word when the user ...

  1. #1
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    Question How to implement tab completion behaviour found in terminals?

    Hello all!

    I'm doing a terminal app and wanted to add the feature of completing the word when the user hits tab. Like in the terminals for folder names and such.

    The tiny problem is I have no idea of how to do that. For example what method to read from the user?
    Code:
    #include <iostream> 
    #include <string> 
    using namespace std; 
     
    int main () { 
      string mystr;
      cin >> mystr; //needs an enter and 
      getline (cin, mystr); //also
    }

  2. #2
    and the hat of int overfl Salem's Avatar
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    Well you should read the FAQ and find out what "raw" terminal options are available to you.
    That is, you get every key as it is pressed.

    Standard C++ is line buffered, so you only get whole lines.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    I hope this wont annoy you but I don't understand your idea. And/or maybe I haven't explained mine very well either.

    You're saying to read the FAQ of my terminal and then see what raw options are available. Then I would use the method to run orders in the terminal from my program. Is this it?

    Because what I wanted is to have a C++ program to run from the command line that is able to complete commands every time the user hits the tab button.
    I thought that this would not be so difficult but maybe it is?

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    How to get individual keys typed from the keyboard, without using buffered input, is operating system dependent. Windows has API calls, Linux/Unix has the termio system.

    Jim

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    I see. So a program with that option would never be very portable pitty.

    Thanks for the reply, I'll see what I should use for Mac.

  6. #6
    and the hat of int overfl Salem's Avatar
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    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

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    wow, at first glance seems pretty awsome!

    I'll dig into it.

    Thanks!

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    I'm sorry for the noobness but I can't figure out how to use it.
    It's a library, so it's supposed to provide functions, right? Sort of like an API?

    Another issue is that, as far as I can understand, Mac users are supposed to use the 4.1 version (instead of 6.1). Before I figured this out I downloaded and installed the 6.1, now I' trying to do the same for 4.1 but get stuck here Fink - Package Database - Package readline (Comfortable terminal input library)

    Do you have experience using this?

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    Quote Originally Posted by kotoko View Post
    Another issue is that, as far as I can understand, Mac users are supposed to use the 4.1 version (instead of 6.1).
    Not what I read; but, I have no idea how to use the library or whatever ReadLine is.

    MacOS X users may obtain MacOS X packages for readline-4.3 from Fink, and readline-6.0 from DarwinPorts or MacPorts.
    Last edited by stahta01; 11-05-2010 at 04:04 PM.

  10. #10
    Super Moderator VirtualAce's Avatar
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    Perhaps learning the language should be your focus instead of trying to implement this or that with it.

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