1#ifndef TERM_H
 2#define TERM_H
 3
 4#include <stdbool.h>
 5#include <stdint.h>
 6#include <sys/types.h>
 7
 8/* resolve 1D rune from 2D input */ 
 9#define RUNE(t, x, y) ((t)->runes[(y) * (t)->cols + (x)])
10#define CSI_PARAMS_MAX (16)
11#define TERM_DEFAULT_FG 0xffffffffu
12#define TERM_DEFAULT_BG 0xff222222u
13#define TERM_ATTR_REVERSE (1 << 0)
14
15typedef enum {
16	TSTATE_NORMAL,
17	TSTATE_ESC,
18	TSTATE_CSI,
19	TSTATE_OSC,
20	TSTATE_OSC_ESC,
21	TSTATE_CHARSET,
22	TSTATE_CHARSET_SKIP,
23} TState;
24
25typedef struct {
26	uint32_t cp;  /* codepoint */
27	uint32_t fg;
28	uint32_t bg;
29	uint8_t  attr;
30	uint8_t  width;
31	bool     dmg; /* rune damaged */
32} Rune;
33
34typedef struct {
35	int x;
36	int y;
37} Caret;
38
39typedef struct {
40	Rune*    runes;
41	Rune*    alt;
42	Caret    saved;
43	uint32_t fg;
44	uint32_t bg;
45	uint8_t  attr;
46
47	int cols;
48	int rows;
49	int scroll_top;
50	int scroll_bot;
51
52	int   ptyfd;
53	pid_t ptypid;
54
55	TState  state;
56	bool    acs[2];
57	int     charset;
58	int     charset_target;
59	bool    wrapnext;
60	bool    cursor_visible;
61	bool    bracketed_paste;
62	int     csi_params[CSI_PARAMS_MAX];
63	int     csi_idx;
64} Term;
65
66/* clear screen by filling runes with ' ' and reseting
67   to default terminal foreground and background */
68void term_clear(Term* t, Caret* c);
69
70/* damage all the runes on terminal */
71void term_damage_all(Term* t);
72
73/* damage a single cell on terminal */
74void term_damage_rune(Term* t, int x, int y);
75
76/* put a character on terminal, handle placing special
77   and normal characters */
78void term_putc(Term* t, Caret* c, uint32_t cp);
79
80/* destroy old terminal and create create new terminal
81   with specified dimensions */
82int term_resize(Term* t, Caret* c, int cols, int rows);
83
84/* scroll viewport up by one */
85void term_scroll(Term* t);
86
87/* processes terminal input, parse escape sequences, update
88   caret, screen state, and damage status. */
89bool term_write(Term* t, Caret* c, const char* s, size_t n);
90
91#endif /* TERM_H */
92