/**
 * Minimal example that uses readline - and tries to use _rl_trace to
 * output a debugging message to /var/tmp/readline.%d.
 *
 * Compile via:
 *
 *    gcc -o rl rl.c -lreadline
 *
 * Enter a few lines, and see if the /var/tmp file appears?  TAB-completion
 * will work if you enter filenames.
 *
 * Main code from: http://en.wikipedia.org/wiki/GNU_Readline#Sample_code
 *
 */


#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <readline/readline.h>
#include <readline/history.h>

int main()
{
    char* input, shell_prompt[100];

    // Configure readline to auto-complete paths when the tab key is hit.
    rl_bind_key('\t', rl_complete);

    for(;;) {
        // Create prompt string from user name and current working directory.
        snprintf(shell_prompt, sizeof(shell_prompt), "%s:%s $ ", getenv("USER"), getcwd(NULL, 1024));

        // Display prompt and read input (n.b. input must be freed after use)...
        input = readline(shell_prompt);

        _rl_trace( "Read %s", input );

        // Check for EOF.
        if (!input)
            break;

        // Add input to history.
        add_history(input);

        // Do stuff...

        // Free input.
        free(input);
    }
}