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mtm.c
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mtm.c
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/* Copyright 2017 - 2019 Rob King <jking@deadpixi.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <locale.h>
#include <pwd.h>
#include <signal.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/types.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#include "vtparser.h"
/*** CONFIGURATION */
#include "config.h"
#define MIN(x, y) ((x) < (y)? (x) : (y))
#define MAX(x, y) ((x) > (y)? (x) : (y))
#define CTL(x) ((x) & 0x1f)
#define USAGE "usage: mtm [-T NAME] [-t NAME] [-c KEY]\n"
/*** DATA TYPES */
typedef enum{
HORIZONTAL,
VERTICAL,
VIEW
} Node;
typedef struct SCRN SCRN;
struct SCRN{
int sy, sx, vis, tos, off;
short fg, bg, sfg, sbg, sp;
bool insert, oxenl, xenl, saved;
attr_t sattr;
WINDOW *win;
};
typedef struct NODE NODE;
struct NODE{
Node t;
int y, x, h, w, pt, ntabs;
bool *tabs, pnm, decom, am, lnm;
wchar_t repc;
NODE *p, *c1, *c2;
SCRN pri, alt, *s;
wchar_t *g0, *g1, *g2, *g3, *gc, *gs, *sgc, *sgs;
VTPARSER vp;
};
/*** GLOBALS AND PROTOTYPES */
static NODE *root, *focused, *lastfocused = NULL;
static int commandkey = CTL(COMMAND_KEY), nfds = 1; /* stdin */
static fd_set fds;
static char iobuf[BUFSIZ];
static void setupevents(NODE *n);
static void reshape(NODE *n, int y, int x, int h, int w);
static void draw(NODE *n);
static void reshapechildren(NODE *n);
static const char *term = NULL;
static void freenode(NODE *n, bool recursive);
void start_pairs(void);
short mtm_alloc_pair(int fg, int bg);
/*** UTILITY FUNCTIONS */
static void
quit(int rc, const char *m) /* Shut down MTM. */
{
if (m)
fprintf(stderr, "%s\n", m);
if (root)
freenode(root, true);
endwin();
exit(rc);
}
static void
safewrite(int fd, const char *b, size_t n) /* Write, checking for errors. */
{
size_t w = 0;
while (w < n){
ssize_t s = write(fd, b + w, n - w);
if (s < 0 && errno != EINTR)
return;
else if (s < 0)
s = 0;
w += (size_t)s;
}
}
static const char *
getshell(void) /* Get the user's preferred shell. */
{
if (getenv("SHELL"))
return getenv("SHELL");
struct passwd *pwd = getpwuid(getuid());
if (pwd)
return pwd->pw_shell;
return "/bin/sh";
}
/*** TERMINAL EMULATION HANDLERS
* These functions implement the various terminal commands activated by
* escape sequences and printing to the terminal. Large amounts of boilerplate
* code is shared among all these functions, and is factored out into the
* macros below:
* PD(n, d) - Parameter n, with default d.
* P0(n) - Parameter n, default 0.
* P1(n) - Parameter n, default 1.
* CALL(h) - Call handler h with no arguments.
* SENDN(n, s, c) - Write string c bytes of s to n.
* SEND(n, s) - Write string s to node n's host.
* (END)HANDLER - Declare/end a handler function
* COMMONVARS - All of the common variables for a handler.
* x, y - cursor position
* mx, my - max possible values for x and y
* px, py - physical cursor position in scrollback
* n - the current node
* win - the current window
* top, bot - the scrolling region
* tos - top of the screen in the pad
* s - the current SCRN buffer
* The funny names for handlers are from their ANSI/ECMA/DEC mnemonics.
*/
#define PD(x, d) (argc < (x) || !argv? (d) : argv[(x)])
#define P0(x) PD(x, 0)
#define P1(x) (!P0(x)? 1 : P0(x))
#define CALL(x) (x)(v, n, 0, 0, 0, NULL, NULL)
#define SENDN(n, s, c) safewrite(n->pt, s, c)
#define SEND(n, s) SENDN(n, s, strlen(s))
#define COMMONVARS \
NODE *n = (NODE *)p; \
SCRN *s = n->s; \
WINDOW *win = s->win; \
int py, px, y, x, my, mx, top = 0, bot = 0, tos = s->tos; \
(void)v; (void)p; (void)w; (void)iw; (void)argc; (void)argv; \
(void)win; (void)y; (void)x; (void)my; (void)mx; (void)osc; \
(void)tos; \
getyx(win, py, px); y = py - s->tos; x = px; \
getmaxyx(win, my, mx); my -= s->tos; \
wgetscrreg(win, &top, &bot); \
bot++; bot -= s->tos; \
top = top <= tos? 0 : top - tos; \
#define HANDLER(name) \
static void \
name (VTPARSER *v, void *p, wchar_t w, wchar_t iw, \
int argc, int *argv, const wchar_t *osc) \
{ COMMONVARS
#define ENDHANDLER n->repc = 0; } /* control sequences aren't repeated */
HANDLER(bell) /* Terminal bell. */
beep();
ENDHANDLER
HANDLER(numkp) /* Application/Numeric Keypad Mode */
n->pnm = (w == L'=');
ENDHANDLER
HANDLER(vis) /* Cursor visibility */
s->vis = iw == L'6'? 0 : 1;
ENDHANDLER
HANDLER(cup) /* CUP - Cursor Position */
s->xenl = false;
wmove(win, tos + (n->decom? top : 0) + P1(0) - 1, P1(1) - 1);
ENDHANDLER
HANDLER(dch) /* DCH - Delete Character */
for (int i = 0; i < P1(0); i++)
wdelch(win);
ENDHANDLER
HANDLER(ich) /* ICH - Insert Character */
for (int i = 0; i < P1(0); i++)
wins_nwstr(win, L" ", 1);
ENDHANDLER
HANDLER(cuu) /* CUU - Cursor Up */
wmove(win, MAX(py - P1(0), tos + top), x);
ENDHANDLER
HANDLER(cud) /* CUD - Cursor Down */
wmove(win, MIN(py + P1(0), tos + bot - 1), x);
ENDHANDLER
HANDLER(cuf) /* CUF - Cursor Forward */
wmove(win, py, MIN(x + P1(0), mx - 1));
ENDHANDLER
HANDLER(ack) /* ACK - Acknowledge Enquiry */
SEND(n, "\006");
ENDHANDLER
HANDLER(hts) /* HTS - Horizontal Tab Set */
if (x < n->ntabs && x > 0)
n->tabs[x] = true;
ENDHANDLER
HANDLER(ri) /* RI - Reverse Index */
int otop = 0, obot = 0;
wgetscrreg(win, &otop, &obot);
wsetscrreg(win, otop >= tos? otop : tos, obot);
y == top? wscrl(win, -1) : wmove(win, MAX(tos, py - 1), x);
wsetscrreg(win, otop, obot);
ENDHANDLER
HANDLER(decid) /* DECID - Send Terminal Identification */
if (w == L'c')
SEND(n, iw == L'>'? "\033[>1;10;0c" : "\033[?1;2c");
else if (w == L'Z')
SEND(n, "\033[?6c");
ENDHANDLER
HANDLER(hpa) /* HPA - Cursor Horizontal Absolute */
wmove(win, py, MIN(P1(0) - 1, mx - 1));
ENDHANDLER
HANDLER(hpr) /* HPR - Cursor Horizontal Relative */
wmove(win, py, MIN(px + P1(0), mx - 1));
ENDHANDLER
HANDLER(vpa) /* VPA - Cursor Vertical Absolute */
wmove(win, MIN(tos + bot - 1, MAX(tos + top, tos + P1(0) - 1)), x);
ENDHANDLER
HANDLER(vpr) /* VPR - Cursor Vertical Relative */
wmove(win, MIN(tos + bot - 1, MAX(tos + top, py + P1(0))), x);
ENDHANDLER
HANDLER(cbt) /* CBT - Cursor Backwards Tab */
for (int i = x - 1; i < n->ntabs && i >= 0; i--) if (n->tabs[i]){
wmove(win, py, i);
return;
}
wmove(win, py, 0);
ENDHANDLER
HANDLER(ht) /* HT - Horizontal Tab */
for (int i = x + 1; i < n->w && i < n->ntabs; i++) if (n->tabs[i]){
wmove(win, py, i);
return;
}
wmove(win, py, mx - 1);
ENDHANDLER
HANDLER(tab) /* Tab forwards or backwards */
for (int i = 0; i < P1(0); i++) switch (w){
case L'I': CALL(ht); break;
case L'\t': CALL(ht); break;
case L'Z': CALL(cbt); break;
}
ENDHANDLER
HANDLER(decaln) /* DECALN - Screen Alignment Test */
chtype e[] = {COLOR_PAIR(0) | 'E', 0};
for (int r = 0; r < my; r++){
for (int c = 0; c <= mx; c++)
mvwaddchnstr(win, tos + r, c, e, 1);
}
wmove(win, py, px);
ENDHANDLER
HANDLER(su) /* SU - Scroll Up/Down */
wscrl(win, (w == L'T' || w == L'^')? -P1(0) : P1(0));
ENDHANDLER
HANDLER(sc) /* SC - Save Cursor */
s->sx = px; /* save X position */
s->sy = py; /* save Y position */
wattr_get(win, &s->sattr, &s->sp, NULL); /* save attrs and color pair */
s->sfg = s->fg; /* save foreground color */
s->sbg = s->bg; /* save background color */
s->oxenl = s->xenl; /* save xenl state */
s->saved = true; /* save data is valid */
n->sgc = n->gc; n->sgs = n->gs; /* save character sets */
ENDHANDLER
HANDLER(rc) /* RC - Restore Cursor */
if (iw == L'#'){
CALL(decaln);
return;
}
if (!s->saved)
return;
wmove(win, s->sy, s->sx); /* get old position */
wattr_set(win, s->sattr, s->sp, NULL); /* get attrs and color pair */
s->fg = s->sfg; /* get foreground color */
s->bg = s->sbg; /* get background color */
s->xenl = s->oxenl; /* get xenl state */
n->gc = n->sgc; n->gs = n->sgs; /* save character sets */
/* restore colors */
int cp = mtm_alloc_pair(s->fg, s->bg);
wcolor_set(win, cp, NULL);
cchar_t c;
setcchar(&c, L" ", A_NORMAL, cp, NULL);
wbkgrndset(win, &c);
ENDHANDLER
HANDLER(tbc) /* TBC - Tabulation Clear */
switch (P0(0)){
case 0: n->tabs[x < n->ntabs? x : 0] = false; break;
case 3: memset(n->tabs, 0, sizeof(bool) * (n->ntabs)); break;
}
ENDHANDLER
HANDLER(cub) /* CUB - Cursor Backward */
s->xenl = false;
wmove(win, py, MAX(x - P1(0), 0));
ENDHANDLER
HANDLER(el) /* EL - Erase in Line */
cchar_t b;
setcchar(&b, L" ", A_NORMAL, mtm_alloc_pair(s->fg, s->bg), NULL);
switch (P0(0)){
case 0: wclrtoeol(win); break;
case 1: for (int i = 0; i <= x; i++) mvwadd_wchnstr(win, py, i, &b, 1); break;
case 2: wmove(win, py, 0); wclrtoeol(win); break;
}
wmove(win, py, x);
ENDHANDLER
HANDLER(ed) /* ED - Erase in Display */
int o = 1;
switch (P0(0)){
case 0: wclrtobot(win); break;
case 3: werase(win); break;
case 2: wmove(win, tos, 0); wclrtobot(win); break;
case 1:
for (int i = tos; i < py; i++){
wmove(win, i, 0);
wclrtoeol(win);
}
wmove(win, py, x);
el(v, p, w, iw, 1, &o, NULL);
break;
}
wmove(win, py, px);
ENDHANDLER
HANDLER(ech) /* ECH - Erase Character */
cchar_t c;
setcchar(&c, L" ", A_NORMAL, mtm_alloc_pair(s->fg, s->bg), NULL);
for (int i = 0; i < P1(0); i++)
mvwadd_wchnstr(win, py, x + i, &c, 1);
wmove(win, py, px);
ENDHANDLER
HANDLER(dsr) /* DSR - Device Status Report */
char buf[100] = {0};
if (P0(0) == 6)
snprintf(buf, sizeof(buf) - 1, "\033[%d;%dR",
(n->decom? y - top : y) + 1, x + 1);
else
snprintf(buf, sizeof(buf) - 1, "\033[0n");
SEND(n, buf);
ENDHANDLER
HANDLER(idl) /* IL or DL - Insert/Delete Line */
/* we don't use insdelln here because it inserts above and not below,
* and has a few other edge cases... */
int otop = 0, obot = 0, p1 = MIN(P1(0), (my - 1) - y);
wgetscrreg(win, &otop, &obot);
wsetscrreg(win, py, obot);
wscrl(win, w == L'L'? -p1 : p1);
wsetscrreg(win, otop, obot);
wmove(win, py, 0);
ENDHANDLER
HANDLER(csr) /* CSR - Change Scrolling Region */
if (wsetscrreg(win, tos + P1(0) - 1, tos + PD(1, my) - 1) == OK)
CALL(cup);
ENDHANDLER
HANDLER(decreqtparm) /* DECREQTPARM - Request Device Parameters */
SEND(n, P0(0)? "\033[3;1;2;120;1;0x" : "\033[2;1;2;120;128;1;0x");
ENDHANDLER
HANDLER(sgr0) /* Reset SGR to default */
wattrset(win, A_NORMAL);
wcolor_set(win, 0, NULL);
s->fg = s->bg = -1;
wbkgdset(win, COLOR_PAIR(0) | ' ');
ENDHANDLER
HANDLER(cls) /* Clear screen */
CALL(cup);
wclrtobot(win);
CALL(cup);
ENDHANDLER
HANDLER(ris) /* RIS - Reset to Initial State */
n->gs = n->gc = n->g0 = CSET_US; n->g1 = CSET_GRAPH;
n->g2 = CSET_US; n->g3 = CSET_GRAPH;
n->decom = s->insert = s->oxenl = s->xenl = n->lnm = false;
CALL(cls);
CALL(sgr0);
n->am = true;
n->pnm = false;
n->pri.vis = n->alt.vis = 1;
n->s = &n->pri;
wsetscrreg(n->pri.win, 0, MAX(SCROLLBACK, n->h) - 1);
wsetscrreg(n->alt.win, 0, n->h - 1);
for (int i = 0; i < n->ntabs; i++)
n->tabs[i] = (i % 8 == 0);
ENDHANDLER
HANDLER(mode) /* Set or Reset Mode */
bool set = (w == L'h');
for (int i = 0; i < argc; i++) switch (P0(i)){
case 1: n->pnm = set; break;
case 3: CALL(cls); break;
case 4: s->insert = set; break;
case 6: n->decom = set; CALL(cup); break;
case 7: n->am = set; break;
case 20: n->lnm = set; break;
case 25: s->vis = set? 1 : 0; break;
case 34: s->vis = set? 1 : 2; break;
case 1048: CALL((set? sc : rc)); break;
case 1049:
CALL((set? sc : rc)); /* fall-through */
case 47: case 1047: if (set && n->s != &n->alt){
n->s = &n->alt;
CALL(cls);
} else if (!set && n->s != &n->pri)
n->s = &n->pri;
break;
}
ENDHANDLER
HANDLER(sgr) /* SGR - Select Graphic Rendition */
bool doc = false, do8 = COLORS >= 8, do16 = COLORS >= 16, do256 = COLORS >= 256;
if (!argc)
CALL(sgr0);
short bg = s->bg, fg = s->fg;
for (int i = 0; i < argc; i++) switch (P0(i)){
case 0: CALL(sgr0); break;
case 1: wattron(win, A_BOLD); break;
case 2: wattron(win, A_DIM); break;
case 4: wattron(win, A_UNDERLINE); break;
case 5: wattron(win, A_BLINK); break;
case 7: wattron(win, A_REVERSE); break;
case 8: wattron(win, A_INVIS); break;
case 22: wattroff(win, A_DIM); wattroff(win, A_BOLD); break;
case 24: wattroff(win, A_UNDERLINE); break;
case 25: wattroff(win, A_BLINK); break;
case 27: wattroff(win, A_REVERSE); break;
case 30: fg = COLOR_BLACK; doc = do8; break;
case 31: fg = COLOR_RED; doc = do8; break;
case 32: fg = COLOR_GREEN; doc = do8; break;
case 33: fg = COLOR_YELLOW; doc = do8; break;
case 34: fg = COLOR_BLUE; doc = do8; break;
case 35: fg = COLOR_MAGENTA; doc = do8; break;
case 36: fg = COLOR_CYAN; doc = do8; break;
case 37: fg = COLOR_WHITE; doc = do8; break;
case 38: fg = P0(i+1) == 5? P0(i+2) : s->fg; i += 2; doc = do256; break;
case 39: fg = -1; doc = true; break;
case 40: bg = COLOR_BLACK; doc = do8; break;
case 41: bg = COLOR_RED; doc = do8; break;
case 42: bg = COLOR_GREEN; doc = do8; break;
case 43: bg = COLOR_YELLOW; doc = do8; break;
case 44: bg = COLOR_BLUE; doc = do8; break;
case 45: bg = COLOR_MAGENTA; doc = do8; break;
case 46: bg = COLOR_CYAN; doc = do8; break;
case 47: bg = COLOR_WHITE; doc = do8; break;
case 48: bg = P0(i+1) == 5? P0(i+2) : s->bg; i += 2; doc = do256; break;
case 49: bg = -1; doc = true; break;
case 90: fg = COLOR_BLACK; doc = do16; break;
case 91: fg = COLOR_RED; doc = do16; break;
case 92: fg = COLOR_GREEN; doc = do16; break;
case 93: fg = COLOR_YELLOW; doc = do16; break;
case 94: fg = COLOR_BLUE; doc = do16; break;
case 95: fg = COLOR_MAGENTA; doc = do16; break;
case 96: fg = COLOR_CYAN; doc = do16; break;
case 97: fg = COLOR_WHITE; doc = do16; break;
case 100: bg = COLOR_BLACK; doc = do16; break;
case 101: bg = COLOR_RED; doc = do16; break;
case 102: bg = COLOR_GREEN; doc = do16; break;
case 103: bg = COLOR_YELLOW; doc = do16; break;
case 104: bg = COLOR_BLUE; doc = do16; break;
case 105: bg = COLOR_MAGENTA; doc = do16; break;
case 106: bg = COLOR_CYAN; doc = do16; break;
case 107: bg = COLOR_WHITE; doc = do16; break;
#if defined(A_ITALIC) && !defined(NO_ITALICS) && !defined(REVERSE_ITALICS)
case 3: wattron(win, A_ITALIC); break;
case 23: wattroff(win, A_ITALIC); break;
#endif
#if defined(REVERSE_ITALICS)
case 3: wattron(win, A_REVERSE); break;
case 23: wattroff(win, A_REVERSE); break;
#endif
}
if (doc){
int p = mtm_alloc_pair(s->fg = fg, s->bg = bg);
wcolor_set(win, p, NULL);
cchar_t c;
setcchar(&c, L" ", A_NORMAL, p, NULL);
wbkgrndset(win, &c);
}
}
HANDLER(cr) /* CR - Carriage Return */
s->xenl = false;
wmove(win, py, 0);
ENDHANDLER
HANDLER(ind) /* IND - Index */
y == (bot - 1)? scroll(win) : wmove(win, py + 1, x);
ENDHANDLER
HANDLER(nel) /* NEL - Next Line */
CALL(cr); CALL(ind);
ENDHANDLER
HANDLER(pnl) /* NL - Newline */
CALL((n->lnm? nel : ind));
ENDHANDLER
HANDLER(cpl) /* CPL - Cursor Previous Line */
wmove(win, MAX(tos + top, py - P1(0)), 0);
ENDHANDLER
HANDLER(cnl) /* CNL - Cursor Next Line */
wmove(win, MIN(tos + bot - 1, py + P1(0)), 0);
ENDHANDLER
HANDLER(print) /* Print a character to the terminal */
if (wcwidth(w) < 0)
return;
if (s->insert)
CALL(ich);
if (s->xenl){
s->xenl = false;
if (n->am)
CALL(nel);
getyx(win, y, x);
y -= tos;
}
if (w < MAXMAP && n->gc[w])
w = n->gc[w];
n->repc = w;
if (x == mx - wcwidth(w)){
s->xenl = true;
wins_nwstr(win, &w, 1);
} else
waddnwstr(win, &w, 1);
n->gc = n->gs;
} /* no ENDHANDLER because we don't want to reset repc */
HANDLER(rep) /* REP - Repeat Character */
for (int i = 0; i < P1(0) && n->repc; i++)
print(v, p, n->repc, 0, 0, NULL, NULL);
ENDHANDLER
HANDLER(scs) /* Select Character Set */
wchar_t **t = NULL;
switch (iw){
case L'(': t = &n->g0; break;
case L')': t = &n->g1; break;
case L'*': t = &n->g2; break;
case L'+': t = &n->g3; break;
default: return; break;
}
switch (w){
case L'A': *t = CSET_UK; break;
case L'B': *t = CSET_US; break;
case L'0': *t = CSET_GRAPH; break;
case L'1': *t = CSET_US; break;
case L'2': *t = CSET_GRAPH; break;
}
ENDHANDLER
HANDLER(so) /* Switch Out/In Character Set */
if (w == 0x0e)
n->gs = n->gc = n->g1; /* locking shift */
else if (w == 0xf)
n->gs = n->gc = n->g0; /* locking shift */
else if (w == L'n')
n->gs = n->gc = n->g2; /* locking shift */
else if (w == L'o')
n->gs = n->gc = n->g3; /* locking shift */
else if (w == L'N'){
n->gs = n->gc; /* non-locking shift */
n->gc = n->g2;
} else if (w == L'O'){
n->gs = n->gc; /* non-locking shift */
n->gc = n->g3;
}
ENDHANDLER
static void
setupevents(NODE *n)
{
n->vp.p = n;
vtonevent(&n->vp, VTPARSER_CONTROL, 0x05, ack);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x07, bell);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x08, cub);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x09, tab);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0a, pnl);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0b, pnl);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0c, pnl);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0d, cr);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0e, so);
vtonevent(&n->vp, VTPARSER_CONTROL, 0x0f, so);
vtonevent(&n->vp, VTPARSER_CSI, L'A', cuu);
vtonevent(&n->vp, VTPARSER_CSI, L'B', cud);
vtonevent(&n->vp, VTPARSER_CSI, L'C', cuf);
vtonevent(&n->vp, VTPARSER_CSI, L'D', cub);
vtonevent(&n->vp, VTPARSER_CSI, L'E', cnl);
vtonevent(&n->vp, VTPARSER_CSI, L'F', cpl);
vtonevent(&n->vp, VTPARSER_CSI, L'G', hpa);
vtonevent(&n->vp, VTPARSER_CSI, L'H', cup);
vtonevent(&n->vp, VTPARSER_CSI, L'I', tab);
vtonevent(&n->vp, VTPARSER_CSI, L'J', ed);
vtonevent(&n->vp, VTPARSER_CSI, L'K', el);
vtonevent(&n->vp, VTPARSER_CSI, L'L', idl);
vtonevent(&n->vp, VTPARSER_CSI, L'M', idl);
vtonevent(&n->vp, VTPARSER_CSI, L'P', dch);
vtonevent(&n->vp, VTPARSER_CSI, L'S', su);
vtonevent(&n->vp, VTPARSER_CSI, L'T', su);
vtonevent(&n->vp, VTPARSER_CSI, L'X', ech);
vtonevent(&n->vp, VTPARSER_CSI, L'Z', tab);
vtonevent(&n->vp, VTPARSER_CSI, L'`', hpa);
vtonevent(&n->vp, VTPARSER_CSI, L'^', su);
vtonevent(&n->vp, VTPARSER_CSI, L'@', ich);
vtonevent(&n->vp, VTPARSER_CSI, L'a', hpr);
vtonevent(&n->vp, VTPARSER_CSI, L'b', rep);
vtonevent(&n->vp, VTPARSER_CSI, L'c', decid);
vtonevent(&n->vp, VTPARSER_CSI, L'd', vpa);
vtonevent(&n->vp, VTPARSER_CSI, L'e', vpr);
vtonevent(&n->vp, VTPARSER_CSI, L'f', cup);
vtonevent(&n->vp, VTPARSER_CSI, L'g', tbc);
vtonevent(&n->vp, VTPARSER_CSI, L'h', mode);
vtonevent(&n->vp, VTPARSER_CSI, L'l', mode);
vtonevent(&n->vp, VTPARSER_CSI, L'm', sgr);
vtonevent(&n->vp, VTPARSER_CSI, L'n', dsr);
vtonevent(&n->vp, VTPARSER_CSI, L'r', csr);
vtonevent(&n->vp, VTPARSER_CSI, L's', sc);
vtonevent(&n->vp, VTPARSER_CSI, L'u', rc);
vtonevent(&n->vp, VTPARSER_CSI, L'x', decreqtparm);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'0', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'1', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'2', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'7', sc);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'8', rc);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'A', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'B', scs);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'D', ind);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'E', nel);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'H', hts);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'M', ri);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'Z', decid);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'c', ris);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'p', vis);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'=', numkp);
vtonevent(&n->vp, VTPARSER_ESCAPE, L'>', numkp);
vtonevent(&n->vp, VTPARSER_PRINT, 0, print);
}
/*** MTM FUNCTIONS
* These functions do the user-visible work of MTM: creating nodes in the
* tree, updating the display, and so on.
*/
static bool *
newtabs(int w, int ow, bool *oldtabs) /* Initialize default tabstops. */
{
bool *tabs = calloc(w, sizeof(bool));
if (!tabs)
return NULL;
for (int i = 0; i < w; i++) /* keep old overlapping tabs */
tabs[i] = i < ow? oldtabs[i] : (i % 8 == 0);
return tabs;
}
static NODE *
newnode(Node t, NODE *p, int y, int x, int h, int w) /* Create a new node. */
{
NODE *n = calloc(1, sizeof(NODE));
bool *tabs = newtabs(w, 0, NULL);
if (!n || h < 2 || w < 2 || !tabs)
return free(n), free(tabs), NULL;
n->t = t;
n->pt = -1;
n->p = p;
n->y = y;
n->x = x;
n->h = h;
n->w = w;
n->tabs = tabs;
n->ntabs = w;
return n;
}
static void
freenode(NODE *n, bool recurse) /* Free a node. */
{
if (n){
if (lastfocused == n)
lastfocused = NULL;
if (n->pri.win)
delwin(n->pri.win);
if (n->alt.win)
delwin(n->alt.win);
if (recurse)
freenode(n->c1, true);
if (recurse)
freenode(n->c2, true);
if (n->pt >= 0){
close(n->pt);
FD_CLR(n->pt, &fds);
}
free(n->tabs);
free(n);
}
}
static void
fixcursor(void) /* Move the terminal cursor to the active view. */
{
if (focused){
int y, x;
curs_set(focused->s->off != focused->s->tos? 0 : focused->s->vis);
getyx(focused->s->win, y, x);
y = MIN(MAX(y, focused->s->tos), focused->s->tos + focused->h - 1);
wmove(focused->s->win, y, x);
}
}
static const char *
getterm(void)
{
const char *envterm = getenv("TERM");
if (term)
return term;
if (envterm && COLORS >= 256 && !strstr(DEFAULT_TERMINAL, "-256color"))
return DEFAULT_256_COLOR_TERMINAL;
return DEFAULT_TERMINAL;
}
static NODE *
newview(NODE *p, int y, int x, int h, int w) /* Open a new view. */
{
struct winsize ws = {.ws_row = h, .ws_col = w};
NODE *n = newnode(VIEW, p, y, x, h, w);
if (!n)
return NULL;
SCRN *pri = &n->pri, *alt = &n->alt;
pri->win = newpad(MAX(h, SCROLLBACK), w);
alt->win = newpad(h, w);
if (!pri->win || !alt->win)
return freenode(n, false), NULL;
pri->tos = pri->off = MAX(0, SCROLLBACK - h);
n->s = pri;
nodelay(pri->win, TRUE); nodelay(alt->win, TRUE);
scrollok(pri->win, TRUE); scrollok(alt->win, TRUE);
keypad(pri->win, TRUE); keypad(alt->win, TRUE);
setupevents(n);
ris(&n->vp, n, L'c', 0, 0, NULL, NULL);
pid_t pid = forkpty(&n->pt, NULL, NULL, &ws);
if (pid < 0){
if (!p)
perror("forkpty");
return freenode(n, false), NULL;
} else if (pid == 0){
char buf[100] = {0};
snprintf(buf, sizeof(buf) - 1, "%lu", (unsigned long)getppid());
setsid();
setenv("MTM", buf, 1);
setenv("TERM", getterm(), 1);
signal(SIGCHLD, SIG_DFL);
execl(getshell(), getshell(), NULL);
return NULL;
}
FD_SET(n->pt, &fds);
fcntl(n->pt, F_SETFL, O_NONBLOCK);
nfds = n->pt > nfds? n->pt : nfds;
return n;
}
static NODE *
newcontainer(Node t, NODE *p, int y, int x, int h, int w,
NODE *c1, NODE *c2) /* Create a new container */
{
NODE *n = newnode(t, p, y, x, h, w);
if (!n)
return NULL;
n->c1 = c1;
n->c2 = c2;
c1->p = c2->p = n;
reshapechildren(n);
return n;
}
static void
focus(NODE *n) /* Focus a node. */
{
if (!n)
return;
else if (n->t == VIEW){
lastfocused = focused;
focused = n;
} else
focus(n->c1? n->c1 : n->c2);
}
#define ABOVE(n) n->y - 2, n->x + n->w / 2
#define BELOW(n) n->y + n->h + 2, n->x + n->w / 2
#define LEFT(n) n->y + n->h / 2, n->x - 2
#define RIGHT(n) n->y + n->h / 2, n->x + n->w + 2
static NODE *
findnode(NODE *n, int y, int x) /* Find the node enclosing y,x. */
{
#define IN(n, y, x) (y >= n->y && y <= n->y + n->h && \
x >= n->x && x <= n->x + n->w)
if (IN(n, y, x)){
if (n->c1 && IN(n->c1, y, x))
return findnode(n->c1, y, x);
if (n->c2 && IN(n->c2, y, x))
return findnode(n->c2, y, x);
return n;
}
return NULL;
}
static void
replacechild(NODE *n, NODE *c1, NODE *c2) /* Replace c1 of n with c2. */
{
c2->p = n;
if (!n){
root = c2;
reshape(c2, 0, 0, LINES, COLS);
} else if (n->c1 == c1)
n->c1 = c2;
else if (n->c2 == c1)
n->c2 = c2;
n = n? n : root;
reshape(n, n->y, n->x, n->h, n->w);
draw(n);
}
static void
removechild(NODE *p, const NODE *c) /* Replace p with other child. */
{
replacechild(p->p, p, c == p->c1? p->c2 : p->c1);
freenode(p, false);
}
static void
deletenode(NODE *n) /* Delete a node. */
{
if (!n || !n->p)
quit(EXIT_SUCCESS, NULL);
if (n == focused)
focus(n->p->c1 == n? n->p->c2 : n->p->c1);
removechild(n->p, n);
freenode(n, true);
}
static void
reshapeview(NODE *n, int d, int ow) /* Reshape a view. */
{
int oy, ox;
bool *tabs = newtabs(n->w, ow, n->tabs);
struct winsize ws = {.ws_row = n->h, .ws_col = n->w};
if (tabs){
free(n->tabs);
n->tabs = tabs;
n->ntabs = n->w;
}
getyx(n->s->win, oy, ox);
wresize(n->pri.win, MAX(n->h, SCROLLBACK), MAX(n->w, 2));
wresize(n->alt.win, MAX(n->h, 2), MAX(n->w, 2));
n->pri.tos = n->pri.off = MAX(0, SCROLLBACK - n->h);
n->alt.tos = n->alt.off = 0;
wsetscrreg(n->pri.win, 0, MAX(SCROLLBACK, n->h) - 1);
wsetscrreg(n->alt.win, 0, n->h - 1);
if (d > 0){ /* make sure the new top line syncs up after reshape */
wmove(n->s->win, oy + d, ox);
wscrl(n->s->win, -d);
}
doupdate();
refresh();
ioctl(n->pt, TIOCSWINSZ, &ws);
}
static void
reshapechildren(NODE *n) /* Reshape all children of a view. */
{
if (n->t == HORIZONTAL){
int i = n->w % 2? 0 : 1;
reshape(n->c1, n->y, n->x, n->h, n->w / 2);
reshape(n->c2, n->y, n->x + n->w / 2 + 1, n->h, n->w / 2 - i);
} else if (n->t == VERTICAL){
int i = n->h % 2? 0 : 1;
reshape(n->c1, n->y, n->x, n->h / 2, n->w);
reshape(n->c2, n->y + n->h / 2 + 1, n->x, n->h / 2 - i, n->w);
}
}
static void
reshape(NODE *n, int y, int x, int h, int w) /* Reshape a node. */
{
if (n->y == y && n->x == x && n->h == h && n->w == w && n->t == VIEW)
return;
int d = n->h - h;
int ow = n->w;
n->y = y;
n->x = x;
n->h = MAX(h, 1);
n->w = MAX(w, 1);
if (n->t == VIEW)
reshapeview(n, d, ow);
else
reshapechildren(n);
draw(n);
}
static void
drawchildren(const NODE *n) /* Draw all children of n. */
{
draw(n->c1);
if (n->t == HORIZONTAL)
mvvline(n->y, n->x + n->w / 2, ACS_VLINE, n->h);
else
mvhline(n->y + n->h / 2, n->x, ACS_HLINE, n->w);
wnoutrefresh(stdscr);
draw(n->c2);
}
static void
draw(NODE *n) /* Draw a node. */
{
if (n->t == VIEW)
pnoutrefresh(n->s->win, n->s->off, 0, n->y, n->x,
n->y + n->h - 1, n->x + n->w - 1);
else
drawchildren(n);
}
static void
split(NODE *n, Node t) /* Split a node. */
{
int nh = t == VERTICAL? (n->h - 1) / 2 : n->h;
int nw = t == HORIZONTAL? (n->w) / 2 : n->w;
NODE *p = n->p;
NODE *v = newview(NULL, 0, 0, MAX(0, nh), MAX(0, nw));
if (!v)
return;
NODE *c = newcontainer(t, n->p, n->y, n->x, n->h, n->w, n, v);
if (!c){
freenode(v, false);
return;
}
replacechild(p, n, c);
focus(v);
draw(p? p : root);
}