Shell.cc

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// **************************************************************************
// **************************************************************************
#include "Shell.h"

#include <fstream>
#include <iostream>

#include <signal.h>    // SIGWINCH
#include <sys/wait.h>  // waitpid
#include <sys/ioctl.h> // ioctl

#include <panel.h>

#define FORK_ALLOWED

using namespace std;

Shell *Shell::This = 0;

// --------------------------------------------------------------------------
//
//
Shell::Shell(const char *prgname) : ReadlineWindow(prgname),
    fPanelHeight(13), fIsVisible(1), fLine(0)
{
    if (stdscr!=0)
    {
        endwin();
        cout << "ERROR - Only one instance of class Shell is allowed." << endl;
        exit(-1);
    }

    This = this;

    // ---------------------- Setup ncurses -------------------------

    initscr();                // Start curses mode

    cbreak();                 // Line buffering disabled, Pass on
    noecho();                 // Switch off echo mode
    nonl();                   // Associate return with CR

    intrflush(stdscr, FALSE);
    keypad(stdscr, FALSE);    // Switch off keymapping for function keys

    start_color();            // Initialize ncurses colors
    use_default_colors();     // Assign terminal default colors to -1
    //assume_default_colors(-1, -1); // standard terminal colors assigned to pair 0

    // Setup colors
    for (int i=1; i<8; i++)
        init_pair(i, i, -1);  // -1: def background

    signal(SIGWINCH, HandleResizeImp);  // Attach HandleResize to SIGWINCH signal

    // ---------------------- Setup pansl --------------------------

    // Create the necessary windows
    WINDOW *wins[4];
    CreateWindows(wins);

    // Initialize the panels
    fPanelIn    = new_panel(wins[0]);
    fPanelFrame = new_panel(wins[1]);
    fPanelOut   = new_panel(wins[2]);

    win.SetWindow(wins[0]);
    wout.SetWindow(wins[2]);

    // Get the panels into the right order for startup
    ShowHide(1);

    // Setup Readline
    SetWindow(wins[0]);
    SetColorPrompt(COLOR_PAIR(COLOR_BLUE));

    // ------------------- Setup key bindings -----------------------
    BindKeySequence("\033OP",    rl_proc_F1);
    BindKeySequence("\033[1;5B", rl_scroll_top);
    BindKeySequence("\033[1;5A", rl_scroll_top);
    BindKeySequence("\033[1;3A", rl_scroll_bot);
    BindKeySequence("\033[1;3B", rl_scroll_bot);
    BindKeySequence("\033[5;3~", rl_top_inc);
    BindKeySequence("\033[6;3~", rl_top_dec);
    BindKeySequence("\033+",     rl_top_resize);
    BindKeySequence("\033-",     rl_top_resize);

    /*
     rl_bind_keyseq("\033\t",   rl_complete); // Meta-Tab
     rl_bind_keyseq("\033[1~",  home); // Home (console)
     rl_bind_keyseq("\033[H",   home); // Home (x)
     rl_bind_keyseq("\033[4~",  end); // End (console)
     rl_bind_keyseq("\033[F",   end); // End (x)
     rl_bind_keyseq("\033[A",   up); // Up
     rl_bind_keyseq("\033[B",   down); // Down
     rl_bind_keyseq("\033[[B",  accept); // F2 (console)
     rl_bind_keyseq("\033OQ",   accept); // F2 (x)
     rl_bind_keyseq("\033[21~", cancel); // F10
     */

    // Ctrl+dn:   \033[1;5B
    // Ctrl+up:   \033[1;5A
    // Alt+up:    \033[1;3A
    // Alt+dn:    \033[1;3B
    // Alt+pg up: \033[5;3~
    // Alt+pg dn: \033[6;3~
}

// --------------------------------------------------------------------------
//
//
Shell::~Shell()
{
    // Maybe not needed because the window is more or less valid until the
    // object is destructed anyway.
    //win.SetWindow(0);
    //wout.SetWindow(0);
    //SetWindow(0);

    endwin();
    cout << "The end." << endl;
}

// --------------------------------------------------------------------------
//
//
void Shell::ShowHide(int v)
{
    if (v>-2)
        fIsVisible = v==-1 ? !fIsVisible : v;

    if (fIsVisible)
    {
        show_panel(fPanelIn);
        show_panel(fPanelFrame);
        show_panel(fPanelOut);
    }
    else
    {
        show_panel(fPanelIn);
        hide_panel(fPanelFrame);
        hide_panel(fPanelOut);
    }

    update_panels();
    doupdate();
}


// --------------------------------------------------------------------------
//
//
void Shell::CreateWindows(WINDOW *w[3], int all)
{
    int maxx, maxy;
    getmaxyx(stdscr, maxy, maxx);

    int separator = maxy-fPanelHeight;

    WINDOW *new_in    = all ? newwin(maxy,    maxx,   0, 0) : 0;
    WINDOW *new_frame = newwin(separator-1,   maxx,   0, 0);
    WINDOW *new_out   = newwin(separator-1-2, maxx-2, 1, 1);

    box(new_frame,     0,0);
    wmove(new_frame,   0, 1);
    waddch(new_frame,  ACS_RTEE);
    wprintw(new_frame, " F1 ");
    waddch(new_frame,  ACS_LTEE);

    scrollok(new_out, true);
    leaveok (new_out, true);

    if (new_in)
    {
        scrollok(new_in, true);  // Allow scrolling
        leaveok (new_in, false);  // Move the cursor with the output

        wmove(new_in, maxy-1, 0);
    }

    w[0] = new_in;
    w[1] = new_frame;
    w[2] = new_out;
}

// --------------------------------------------------------------------------
//
//
int Shell::rl_proc_F1(int /*cnt*/, int /*key*/)
{
    This->ShowHide(-1); // toggle
    return 0;
}

int Shell::rl_scroll_top(int, int key)
{
    This->win << "Scroll " << key << endl;
    return 0;
}

int Shell::rl_scroll_bot(int, int key)
{
    This->win << "Scroll " << key << endl;
    return 0;
}

int Shell::rl_top_inc(int, int key)
{
    This->win << "Increase " << key << endl;
    return 0;
}

int Shell::rl_top_dec(int, int key)
{
    This->win << "Increase " << key << endl;
    return 0;
}

int Shell::rl_top_resize(int, int key)
{
    This->Resize(key=='+' ? This->fPanelHeight-1 : This->fPanelHeight+1);
    return 0;
}


// --------------------------------------------------------------------------
//
//
void Shell::HandleResizeImp(int)
{
    This->HandleResize();
}

// --------------------------------------------------------------------------
//
//
void Shell::HandleResize()
{
    // Get the new terminal size
    struct winsize w;
    ioctl(0, TIOCGWINSZ, &w);

    // propagate it to the terminal
    resize_term(w.ws_row, w.ws_col);

    // Store the pointer to the old windows
    WINDOW *w_in    = panel_window(fPanelIn);
    WINDOW *w_frame = panel_window(fPanelFrame);
    WINDOW *w_out   = panel_window(fPanelOut);

    // Create new windows
    WINDOW *wins[3];
    CreateWindows(wins);

    // Redirect the streams and the readline output to the new windows
    win.SetWindow(wins[0]);
    wout.SetWindow(wins[2]);

    SetWindow(wins[0]);

    // Replace windows in the panels
    replace_panel(fPanelIn,    wins[0]);
    replace_panel(fPanelFrame, wins[1]);
    replace_panel(fPanelOut,   wins[2]);

    // delete the old obsolete windows
    delwin(w_in);
    delwin(w_out);
    delwin(w_frame);

    // FIXME:  NEEDED also in Redisplay panel
    //Redisplay();

    // Redisplay their contents
    win.Display();
    wout.Display();
}

// --------------------------------------------------------------------------
//
//
bool Shell::Resize(int h)
{
    // Get curretn terminal size
    int lines, cols;
    getmaxyx(stdscr, lines, cols);

    // Check if we are in a valid range
    if (h<1 || h>lines-5)
        return false;

    // Set new height for panel to be kept free
    fPanelHeight = h;

    // Store the pointers of the old windows associated with the panels
    // which should be resized
    WINDOW *w_frame = panel_window(fPanelFrame);
    WINDOW *w_out   = panel_window(fPanelOut);

    // Create new windows
    WINDOW *wins[3];
    CreateWindows(wins, false);

    // Redirect the output stream to the new window
    wout.SetWindow(wins[2]);

    // Replace the windows associated with the panels
    replace_panel(fPanelFrame, wins[1]);
    replace_panel(fPanelOut,   wins[2]);

    // delete the ols windows
    delwin(w_out);
    delwin(w_frame);

    // FIXME:  NEEDED also in Redisplay panel
    //Redisplay();

    // Redisplay the contents
    wout.Display();

    return true;
}

bool Shell::PrintKeyBindings()
{
    ReadlineColor::PrintKeyBindings(win);
    win << " " << kUnderline << "Special key bindings:" << endl << endl;;
    win << kBold << "   F1              " << kReset << "Toggle visibility of upper panel" << endl;
    win << endl;
    return true;
}

bool Shell::PrintGeneralHelp()
{
    ReadlineColor::PrintGeneralHelp(win, GetName());
    win << kBold << "   hide         " << kReset << "Hide upper panel." << endl;
    win << kBold << "   show         " << kReset << "Show upper panel." << endl;
    win << kBold << "   height <h>   " << kReset << "Set height of upper panel to h." << endl;
    win << endl;
    return true;
}

// --------------------------------------------------------------------------
//
//
bool Shell::Process(const string &str)
{
    // Implement readline commands:
    //   rl set     (rl_variable_bind(..))
    //   rl_read_init_file(filename)
    //  int rl_add_defun (const char *name, rl_command_func_t *function, int key)

    if (ReadlineColor::Process(win, str))
        return true;

    if (Readline::Process(str))
        return true;

    // ----------- ReadlineNcurses -----------

    if (string(str)=="hide")
    {
        ShowHide(0);
        return true;
    }
    if (string(str)=="show")
    {
        ShowHide(1);
        return true;
    }

    if (str.substr(0, 7)=="height ")
    {
        int h;
        sscanf(str.c_str()+7, "%d", &h);
        return Resize(h);
    }

    if (str=="d")
    {
        wout.Display();
        return true;
    }

    return false;
}

// --------------------------------------------------------------------------
//
void Shell::Shutdown(const char *buf)
{
    ReadlineWindow::Shutdown(buf);

    // Now move the cursor to the start of the prompt
    RewindCursor();

    // Output the text ourself to get it into the backlog
    // buffer of win. We cannot use GetBuffer() because rl_end
    // is not updated finally.
    win << kBlue << GetPrompt() << kReset << buf << endl;
}