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135 lines
4.3 KiB
C++
135 lines
4.3 KiB
C++
/**
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* @file vt52_curses.hh
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*/
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#ifndef __vt52_curses_hh
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#define __vt52_curses_hh
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#include <curses.h>
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#include <term.h>
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#undef set_window /* XXX term.h #defines this... */
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#include <list>
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#include <string>
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#include "view_curses.hh"
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/**
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* VT52 emulator for curses, useful for mediating between curses and readline,
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* which don't play well together. It is expected that a subclass of this
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* class will fork off a child process that sends and receives VT52 keycodes(?)
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* which is translated by this class into curses calls.
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*
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* VT52 seems to be the simplest terminal to emulate since we do not need to
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* maintain the state of the screen, beyond past lines. For example, when
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* inserting a character, VT52 moves the cursor to the insertion point, clears
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* the rest of the line and then rewrites the rest of the line with the new
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* character. This is in contrast to VT100 which moves the cursor to the
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* insertion point and then sends a code to insert the character and relying
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* on the terminal to shift the rest of the line to the right a character.
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*/
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class vt52_curses
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: public view_curses {
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public:
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vt52_curses();
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virtual ~vt52_curses();
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/** @param win The curses window this view is attached to. */
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void set_window(WINDOW *win) { this->vc_window = win; };
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/** @return The curses window this view is attached to. */
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WINDOW *get_window() { return this->vc_window; };
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/**
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* Set the Y position of this view on the display. A value greater than
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* zero is considered to be an absolute size. A value less than zero makes
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* the position relative to the bottom of the enclosing window.
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*
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* @param y The Y position of the cursor on the curses display.
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*/
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void set_y(int y) { this->vc_y = y; };
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/** @return The abs/rel Y position of the cursor on the curses display. */
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int get_y() { return this->vc_y; };
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/** @param x The X position of the cursor on the curses display. */
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void set_x(int x) { this->vc_x = x; };
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/** @return The X position of the cursor on the curses display. */
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int get_x() { return this->vc_x; };
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/**
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* @return The height of this view, which consists of a single line for
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* input, plus any past lines of output, which will appear ABOVE the Y
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* position for this view.
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* @todo Kinda hardwired to the way readline works.
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*/
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int get_height() { return this->vc_past_lines.size() + 1; };
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void set_max_height(int mh) { this->vc_max_height = mh; };
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int get_max_height() { return this->vc_max_height; };
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/**
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* Map an ncurses input keycode to a vt52 sequence.
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*
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* @param ch The input character.
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* @param len_out The length of the returned sequence.
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* @return The vt52 sequence to send to the child.
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*/
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const char *map_input(int ch, int &len_out);
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/**
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* Map VT52 output to ncurses calls.
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*
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* @param output VT52 encoded output from the child process.
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* @param len The length of the output array.
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*/
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void map_output(const char *output, int len);
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/**
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* Paints any past lines and moves the cursor to the current X position.
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*/
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void do_update(void);
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const static char ESCAPE = 27; /*< VT52 Escape key value. */
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const static char BACKSPACE = 8; /*< VT52 Backspace key value. */
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const static char BELL = 7; /*< VT52 Bell value. */
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const static char STX = 2; /*< VT52 Start-of-text value. */
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protected:
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/** @return The absolute Y position of this view. */
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int get_actual_y()
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{
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unsigned long width, height;
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int retval;
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getmaxyx(this->vc_window, height, width);
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if (this->vc_y < 0) {
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retval = height + this->vc_y;
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}
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else {
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retval = this->vc_y;
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}
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return retval;
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};
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WINDOW *vc_window; /*< The window that contains this view. */
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int vc_x; /*< The X position of the cursor. */
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int vc_y; /*< The Y position of the cursor. */
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int vc_max_height;
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char vc_escape[16]; /*< Storage for escape sequences. */
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int vc_escape_len; /*< The number of chars in vc_escape. */
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char vc_map_buffer; /*<
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* Buffer returned by map_input for trivial
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* translations (one-to-one).
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*/
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/** Vector of past lines of output from the child. */
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std::list<std::string> vc_past_lines;
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};
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#endif
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