config-get and config-set now work

[clinton/Smoothieware.git] / src / modules / utils / simpleshell / SimpleShell.cpp

#include "mbed.h"
#include "libs/Kernel.h"
#include "SimpleShell.h"
#include "libs/nuts_bolts.h"
#include "libs/utils.h"


void SimpleShell::on_module_loaded(){
    this->current_path = "/";
    this->register_for_event(ON_CONSOLE_LINE_RECEIVED);
}

// When a new line is received, check if it is a command, and if it is, act upon it
void SimpleShell::on_console_line_received( void* argument ){
    string possible_command = *static_cast<string*>(argument);

    // We don't compare to a string but to a checksum of that string, this saves some space in flash memory
    unsigned short check_sum = get_checksum( possible_command.substr(0,possible_command.find_first_of(" \r\n")) );  // todo: put this method somewhere more convenient
    
    // Act depending on command
    switch( check_sum ){
        case ls_command_checksum      : this->ls_command( get_arguments(possible_command)); break;
        case cd_command_checksum      : this->cd_command( get_arguments(possible_command)); break;
        case cat_command_checksum     : this->cat_command(get_arguments(possible_command)); break;
    }
}

// Convert a path indication ( absolute or relative ) into a path ( absolute )
string SimpleShell::absolute_from_relative( string path ){
    if( path[0] == '/' ){ return path; }
    if( path[0] == '.' ){ return this->current_path; } 
    return this->current_path + path;
}

// Act upon an ls command
// Convert the first parameter into an absolute path, then list the files in that path
void SimpleShell::ls_command( string parameters ){
    string folder = this->absolute_from_relative( parameters );
    DIR* d;
    struct dirent* p;
    d = opendir(folder.c_str());
    if(d != NULL) {
        while((p = readdir(d)) != NULL) { this->kernel->serial->printf("%s\r\n", lc(string(p->d_name)).c_str()); }
    } else {
        this->kernel->serial->printf("Could not open directory %s \r\n", folder.c_str());
    }
}

// Change current absolute path to provided path
void SimpleShell::cd_command( string parameters ){
    string folder = this->absolute_from_relative( parameters );
    if( folder[folder.length()-1] != '/' ){ folder += "/"; }
    DIR *d;
    struct dirent *p;
    d = opendir(folder.c_str());
    if(d == NULL) { 
        this->kernel->serial->printf("Could not open directory %s \r\n", folder.c_str() ); 
    }else{
        this->current_path = folder;
    }
}

// Output the contents of a file, first parameter is the filename, second is the limit ( in number of lines to output )
void SimpleShell::cat_command( string parameters ){
    
    // Get parameters ( filename and line limit ) 
    string filename          = this->absolute_from_relative(shift_parameter( parameters ));
    string limit_paramater   = shift_parameter( parameters );
    int limit = -1;
    if( limit_paramater != "" ){ limit = int(atof(limit_paramater.c_str())); }
   
    // Open file 
    FILE *lp = fopen(filename.c_str(), "r");
    string buffer;
    int c;
    int newlines = 0; 
    
    // Print each line of the file
    while ((c = fgetc (lp)) != EOF){
        if( char(c) == '\n' ){  newlines++; }
        this->kernel->serial->putc(c); 
        if( newlines == limit ){ break; }
    }; 
    fclose(lp);

}