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dvtm.c
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/*
* The initial "port" of dwm to curses was done by
*
* © 2007-2016 Marc André Tanner <mat at brain-dump dot org>
*
* It is highly inspired by the original X11 dwm and
* reuses some code of it which is mostly
*
* © 2006-2007 Anselm R. Garbe <garbeam at gmail dot com>
*
* See LICENSE for details.
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <wchar.h>
#include <limits.h>
#include <libgen.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/types.h>
#include <fcntl.h>
#include <curses.h>
#include <stdio.h>
#include <stdarg.h>
#include <signal.h>
#include <locale.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <errno.h>
#include <pwd.h>
#if defined __CYGWIN__ || defined __sun
# include <termios.h>
#endif
#include "vt.h"
#ifdef PDCURSES
int ESCDELAY;
#endif
#ifndef NCURSES_REENTRANT
# define set_escdelay(d) (ESCDELAY = (d))
#endif
typedef struct {
float mfact;
unsigned int nmaster;
int history;
int w;
int h;
volatile sig_atomic_t need_resize;
} Screen;
typedef struct {
const char *symbol;
void (*arrange)(void);
} Layout;
typedef struct Client Client;
struct Client {
WINDOW *window;
Vt *term;
Vt *editor, *app;
int editor_fds[2];
volatile sig_atomic_t editor_died;
const char *cmd;
char title[255];
int order;
pid_t pid;
unsigned short int id;
unsigned short int x;
unsigned short int y;
unsigned short int w;
unsigned short int h;
bool has_title_line;
bool minimized;
bool urgent;
volatile sig_atomic_t died;
Client *next;
Client *prev;
Client *snext;
unsigned int tags;
};
typedef struct {
short fg;
short bg;
short fg256;
short bg256;
short pair;
} Color;
typedef struct {
const char *title;
attr_t attrs;
Color *color;
} ColorRule;
#define ALT(k) ((k) + (161 - 'a'))
#if defined CTRL && defined _AIX
#undef CTRL
#endif
#ifndef CTRL
#define CTRL(k) ((k) & 0x1F)
#endif
#define CTRL_ALT(k) ((k) + (129 - 'a'))
#define MAX_ARGS 8
typedef struct {
void (*cmd)(const char *args[]);
const char *args[3];
} Action;
#define MAX_KEYS 3
typedef unsigned int KeyCombo[MAX_KEYS];
typedef struct {
KeyCombo keys;
Action action;
} KeyBinding;
typedef struct {
mmask_t mask;
Action action;
} Button;
typedef struct {
const char *name;
Action action;
} Cmd;
enum { BAR_TOP, BAR_BOTTOM, BAR_OFF };
typedef struct {
int fd;
int pos, lastpos;
bool autohide;
unsigned short int h;
unsigned short int y;
char text[512];
const char *file;
} StatusBar;
typedef struct {
int fd;
const char *file;
unsigned short int id;
} CmdFifo;
typedef struct {
char *data;
size_t len;
size_t size;
} Register;
typedef struct {
char *name;
const char *argv[4];
bool filter;
bool color;
} Editor;
#define LENGTH(arr) (sizeof(arr) / sizeof((arr)[0]))
#define MAX(x, y) ((x) > (y) ? (x) : (y))
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#define TAGMASK ((1 << LENGTH(tags)) - 1)
#ifdef NDEBUG
#define debug(format, args...)
#else
#define debug eprint
#endif
/* commands for use by keybindings */
static void create(const char *args[]);
static void copymode(const char *args[]);
static void focusn(const char *args[]);
static void focusid(const char *args[]);
static void focusnext(const char *args[]);
static void focusnextnm(const char *args[]);
static void focusprev(const char *args[]);
static void focusprevnm(const char *args[]);
static void focuslast(const char *args[]);
static void focusup(const char *args[]);
static void focusdown(const char *args[]);
static void focusleft(const char *args[]);
static void focusright(const char *args[]);
static void killclient(const char *args[]);
static void paste(const char *args[]);
static void quit(const char *args[]);
static void redraw(const char *args[]);
static void scrollback(const char *args[]);
static void send(const char *args[]);
static void setlayout(const char *args[]);
static void incnmaster(const char *args[]);
static void setmfact(const char *args[]);
static void startup(const char *args[]);
static void tag(const char *args[]);
static void tagid(const char *args[]);
static void togglebar(const char *args[]);
static void togglebarpos(const char *args[]);
static void toggleminimize(const char *args[]);
static void togglemouse(const char *args[]);
static void togglerunall(const char *args[]);
static void toggletag(const char *args[]);
static void toggleview(const char *args[]);
static void viewprevtag(const char *args[]);
static void view(const char *args[]);
static void zoom(const char *args[]);
/* commands for use by mouse bindings */
static void mouse_focus(const char *args[]);
static void mouse_fullscreen(const char *args[]);
static void mouse_minimize(const char *args[]);
static void mouse_zoom(const char *args[]);
/* functions and variables available to layouts via config.h */
static Client* nextvisible(Client *c);
static void focus(Client *c);
static void resize(Client *c, int x, int y, int w, int h);
extern Screen screen;
static unsigned int waw, wah, wax, way;
static Client *clients = NULL;
static char *title;
#include "config.h"
/* global variables */
static const char *dvtm_name = "dvtm";
Screen screen = { .mfact = MFACT, .nmaster = NMASTER, .history = SCROLL_HISTORY };
static Client *stack = NULL;
static Client *sel = NULL;
static Client *lastsel = NULL;
static Client *msel = NULL;
static unsigned int seltags;
static unsigned int tagset[2] = { 1, 1 };
static bool mouse_events_enabled = ENABLE_MOUSE;
static Layout *layout = layouts;
static StatusBar bar = { .fd = -1, .lastpos = BAR_POS, .pos = BAR_POS, .autohide = BAR_AUTOHIDE, .h = 1 };
static CmdFifo cmdfifo = { .fd = -1 };
static const char *shell;
static Register copyreg;
static volatile sig_atomic_t running = true;
static bool runinall = false;
static void
eprint(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
}
static void
error(const char *errstr, ...) {
va_list ap;
va_start(ap, errstr);
vfprintf(stderr, errstr, ap);
va_end(ap);
exit(EXIT_FAILURE);
}
static bool
isarrange(void (*func)()) {
return func == layout->arrange;
}
static bool
isvisible(Client *c) {
return c->tags & tagset[seltags];
}
static bool
is_content_visible(Client *c) {
if (!c)
return false;
if (isarrange(fullscreen))
return sel == c;
return isvisible(c) && !c->minimized;
}
static Client*
nextvisible(Client *c) {
for (; c && !isvisible(c); c = c->next);
return c;
}
static void
updatebarpos(void) {
bar.y = 0;
wax = 0;
way = 0;
wah = screen.h;
waw = screen.w;
if (bar.pos == BAR_TOP) {
wah -= bar.h;
way += bar.h;
} else if (bar.pos == BAR_BOTTOM) {
wah -= bar.h;
bar.y = wah;
}
}
static void
hidebar(void) {
if (bar.pos != BAR_OFF) {
bar.lastpos = bar.pos;
bar.pos = BAR_OFF;
}
}
static void
showbar(void) {
if (bar.pos == BAR_OFF)
bar.pos = bar.lastpos;
}
static void
drawbar(void) {
int sx, sy, x, y, width;
unsigned int occupied = 0, urgent = 0;
if (bar.pos == BAR_OFF)
return;
for (Client *c = clients; c; c = c->next) {
occupied |= c->tags;
if (c->urgent)
urgent |= c->tags;
}
getyx(stdscr, sy, sx);
attrset(BAR_ATTR);
move(bar.y, 0);
for (unsigned int i = 0; i < LENGTH(tags); i++){
if (tagset[seltags] & (1 << i))
attrset(TAG_SEL);
else if (urgent & (1 << i))
attrset(TAG_URGENT);
else if (occupied & (1 << i))
attrset(TAG_OCCUPIED);
else
attrset(TAG_NORMAL);
printw(TAG_SYMBOL, tags[i]);
}
attrset(runinall ? TAG_SEL : TAG_NORMAL);
addstr(layout->symbol);
attrset(TAG_NORMAL);
getyx(stdscr, y, x);
(void)y;
int maxwidth = screen.w - x - 2;
addch(BAR_BEGIN);
attrset(BAR_ATTR);
wchar_t wbuf[sizeof bar.text];
size_t numchars = mbstowcs(wbuf, bar.text, sizeof bar.text);
if (numchars != (size_t)-1 && (width = wcswidth(wbuf, maxwidth)) != -1) {
int pos;
for (pos = 0; pos + width < maxwidth; pos++)
addch(' ');
for (size_t i = 0; i < numchars; i++) {
pos += wcwidth(wbuf[i]);
if (pos > maxwidth)
break;
addnwstr(wbuf+i, 1);
}
clrtoeol();
}
attrset(TAG_NORMAL);
mvaddch(bar.y, screen.w - 1, BAR_END);
attrset(NORMAL_ATTR);
move(sy, sx);
wnoutrefresh(stdscr);
}
static int
show_border(void) {
return (bar.pos != BAR_OFF) || (clients && clients->next);
}
static void
draw_border(Client *c) {
char t = '\0';
int x, y, maxlen, attrs = NORMAL_ATTR;
if (!show_border())
return;
if (sel != c && c->urgent)
attrs = URGENT_ATTR;
if (sel == c || (runinall && !c->minimized))
attrs = SELECTED_ATTR;
wattrset(c->window, attrs);
getyx(c->window, y, x);
mvwhline(c->window, 0, 0, ACS_HLINE, c->w);
maxlen = c->w - 10;
if (maxlen < 0)
maxlen = 0;
if ((size_t)maxlen < sizeof(c->title)) {
t = c->title[maxlen];
c->title[maxlen] = '\0';
}
mvwprintw(c->window, 0, 2, "[%s%s#%d]",
*c->title ? c->title : "",
*c->title ? " | " : "",
c->order);
if (t)
c->title[maxlen] = t;
wmove(c->window, y, x);
}
static void
draw_content(Client *c) {
vt_draw(c->term, c->window, c->has_title_line, 0);
}
static void
draw(Client *c) {
if (is_content_visible(c)) {
redrawwin(c->window);
draw_content(c);
}
if (!isarrange(fullscreen) || sel == c)
draw_border(c);
wnoutrefresh(c->window);
}
static void
draw_all(void) {
if (!nextvisible(clients)) {
sel = NULL;
curs_set(0);
erase();
drawbar();
doupdate();
return;
}
if (!isarrange(fullscreen)) {
for (Client *c = nextvisible(clients); c; c = nextvisible(c->next)) {
if (c != sel)
draw(c);
}
}
/* as a last step the selected window is redrawn,
* this has the effect that the cursor position is
* accurate
*/
if (sel)
draw(sel);
}
static void
arrange(void) {
unsigned int m = 0, n = 0;
for (Client *c = nextvisible(clients); c; c = nextvisible(c->next)) {
c->order = ++n;
if (c->minimized)
m++;
}
erase();
attrset(NORMAL_ATTR);
if (bar.fd == -1 && bar.autohide) {
if ((!clients || !clients->next) && n == 1)
hidebar();
else
showbar();
updatebarpos();
}
if (m && !isarrange(fullscreen))
wah--;
layout->arrange();
if (m && !isarrange(fullscreen)) {
unsigned int i = 0, nw = waw / m, nx = wax;
for (Client *c = nextvisible(clients); c; c = nextvisible(c->next)) {
if (c->minimized) {
resize(c, nx, way+wah, ++i == m ? waw - nx : nw, 1);
nx += nw;
}
}
wah++;
}
focus(NULL);
wnoutrefresh(stdscr);
drawbar();
draw_all();
}
static void
attach(Client *c) {
if (clients)
clients->prev = c;
c->next = clients;
c->prev = NULL;
clients = c;
for (int o = 1; c; c = nextvisible(c->next), o++)
c->order = o;
}
static void
attachafter(Client *c, Client *a) { /* attach c after a */
if (c == a)
return;
if (!a)
for (a = clients; a && a->next; a = a->next);
if (a) {
if (a->next)
a->next->prev = c;
c->next = a->next;
c->prev = a;
a->next = c;
for (int o = a->order; c; c = nextvisible(c->next))
c->order = ++o;
}
}
static void
attachstack(Client *c) {
c->snext = stack;
stack = c;
}
static void
detach(Client *c) {
Client *d;
if (c->prev)
c->prev->next = c->next;
if (c->next) {
c->next->prev = c->prev;
for (d = nextvisible(c->next); d; d = nextvisible(d->next))
--d->order;
}
if (c == clients)
clients = c->next;
c->next = c->prev = NULL;
}
static void
settitle(Client *c) {
char *term, *t = title;
if (!t && sel == c && *c->title)
t = c->title;
if (t && (term = getenv("TERM")) && !strstr(term, "linux")) {
printf("\033]0;%s\007", t);
fflush(stdout);
}
}
static void
detachstack(Client *c) {
Client **tc;
for (tc = &stack; *tc && *tc != c; tc = &(*tc)->snext);
*tc = c->snext;
}
static void
focus(Client *c) {
if (!c)
for (c = stack; c && !isvisible(c); c = c->snext);
if (sel == c)
return;
lastsel = sel;
sel = c;
if (lastsel) {
lastsel->urgent = false;
if (!isarrange(fullscreen)) {
draw_border(lastsel);
wnoutrefresh(lastsel->window);
}
}
if (c) {
detachstack(c);
attachstack(c);
settitle(c);
c->urgent = false;
if (isarrange(fullscreen)) {
draw(c);
} else {
draw_border(c);
wnoutrefresh(c->window);
}
}
curs_set(c && !c->minimized && vt_cursor_visible(c->term));
}
static void
applycolorrules(Client *c) {
const ColorRule *r = colorrules;
short fg = r->color->fg, bg = r->color->bg;
attr_t attrs = r->attrs;
for (unsigned int i = 1; i < LENGTH(colorrules); i++) {
r = &colorrules[i];
if (strstr(c->title, r->title)) {
attrs = r->attrs;
fg = r->color->fg;
bg = r->color->bg;
break;
}
}
vt_default_colors_set(c->term, attrs, fg, bg);
}
static void
term_title_handler(Vt *term, const char *title) {
Client *c = (Client *)vt_data_get(term);
if (title)
strncpy(c->title, title, sizeof(c->title) - 1);
c->title[title ? sizeof(c->title) - 1 : 0] = '\0';
settitle(c);
if (!isarrange(fullscreen) || sel == c)
draw_border(c);
applycolorrules(c);
}
static void
term_urgent_handler(Vt *term) {
Client *c = (Client *)vt_data_get(term);
c->urgent = true;
printf("\a");
fflush(stdout);
drawbar();
if (!isarrange(fullscreen) && sel != c && isvisible(c))
draw_border(c);
}
static void
move_client(Client *c, int x, int y) {
if (c->x == x && c->y == y)
return;
debug("moving, x: %d y: %d\n", x, y);
if (mvwin(c->window, y, x) == ERR) {
eprint("error moving, x: %d y: %d\n", x, y);
} else {
c->x = x;
c->y = y;
}
}
static void
resize_client(Client *c, int w, int h) {
bool has_title_line = show_border();
bool resize_window = c->w != w || c->h != h;
if (resize_window) {
debug("resizing, w: %d h: %d\n", w, h);
if (wresize(c->window, h, w) == ERR) {
eprint("error resizing, w: %d h: %d\n", w, h);
} else {
c->w = w;
c->h = h;
}
}
if (resize_window || c->has_title_line != has_title_line) {
c->has_title_line = has_title_line;
vt_resize(c->app, h - has_title_line, w);
if (c->editor)
vt_resize(c->editor, h - has_title_line, w);
}
}
static void
resize(Client *c, int x, int y, int w, int h) {
resize_client(c, w, h);
move_client(c, x, y);
}
static Client*
get_client_by_coord(unsigned int x, unsigned int y) {
if (y < way || y >= way+wah)
return NULL;
if (isarrange(fullscreen))
return sel;
for (Client *c = nextvisible(clients); c; c = nextvisible(c->next)) {
if (x >= c->x && x < c->x + c->w && y >= c->y && y < c->y + c->h) {
debug("mouse event, x: %d y: %d client: %d\n", x, y, c->order);
return c;
}
}
return NULL;
}
static void
sigchld_handler(int sig) {
int errsv = errno;
int status;
pid_t pid;
while ((pid = waitpid(-1, &status, WNOHANG)) != 0) {
if (pid == -1) {
if (errno == ECHILD) {
/* no more child processes */
break;
}
eprint("waitpid: %s\n", strerror(errno));
break;
}
debug("child with pid %d died\n", pid);
for (Client *c = clients; c; c = c->next) {
if (c->pid == pid) {
c->died = true;
break;
}
if (c->editor && vt_pid_get(c->editor) == pid) {
c->editor_died = true;
break;
}
}
}
errno = errsv;
}
static void
sigwinch_handler(int sig) {
screen.need_resize = true;
}
static void
sigterm_handler(int sig) {
running = false;
}
static void
resize_screen(void) {
struct winsize ws;
if (ioctl(0, TIOCGWINSZ, &ws) == -1) {
getmaxyx(stdscr, screen.h, screen.w);
} else {
screen.w = ws.ws_col;
screen.h = ws.ws_row;
}
debug("resize_screen(), w: %d h: %d\n", screen.w, screen.h);
resizeterm(screen.h, screen.w);
wresize(stdscr, screen.h, screen.w);
updatebarpos();
clear();
arrange();
}
static KeyBinding*
keybinding(KeyCombo keys, unsigned int keycount) {
for (unsigned int b = 0; b < LENGTH(bindings); b++) {
for (unsigned int k = 0; k < keycount; k++) {
if (keys[k] != bindings[b].keys[k])
break;
if (k == keycount - 1)
return &bindings[b];
}
}
return NULL;
}
static unsigned int
bitoftag(const char *tag) {
unsigned int i;
if (!tag)
return ~0;
for (i = 0; (i < LENGTH(tags)) && strcmp(tags[i], tag); i++);
return (i < LENGTH(tags)) ? (1 << i) : 0;
}
static void
tagschanged() {
bool allminimized = true;
for (Client *c = nextvisible(clients); c; c = nextvisible(c->next)) {
if (!c->minimized) {
allminimized = false;
break;
}
}
if (allminimized && nextvisible(clients)) {
focus(NULL);
toggleminimize(NULL);
}
arrange();
}
static void
tag(const char *args[]) {
if (!sel)
return;
sel->tags = bitoftag(args[0]) & TAGMASK;
tagschanged();
}
static void
tagid(const char *args[]) {
if (!args[0] || !args[1])
return;
const int win_id = atoi(args[0]);
for (Client *c = clients; c; c = c->next) {
if (c->id == win_id) {
unsigned int ntags = c->tags;
for (unsigned int i = 1; i < MAX_ARGS && args[i]; i++) {
if (args[i][0] == '+')
ntags |= bitoftag(args[i]+1);
else if (args[i][0] == '-')
ntags &= ~bitoftag(args[i]+1);
else
ntags = bitoftag(args[i]);
}
ntags &= TAGMASK;
if (ntags) {
c->tags = ntags;
tagschanged();
}
return;
}
}
}
static void
toggletag(const char *args[]) {
if (!sel)
return;
unsigned int newtags = sel->tags ^ (bitoftag(args[0]) & TAGMASK);
if (newtags) {
sel->tags = newtags;
tagschanged();
}
}
static void
toggleview(const char *args[]) {
unsigned int newtagset = tagset[seltags] ^ (bitoftag(args[0]) & TAGMASK);
if (newtagset) {
tagset[seltags] = newtagset;
tagschanged();
}
}
static void
view(const char *args[]) {
unsigned int newtagset = bitoftag(args[0]) & TAGMASK;
if (tagset[seltags] != newtagset && newtagset) {
seltags ^= 1; /* toggle sel tagset */
tagset[seltags] = newtagset;
tagschanged();
}
}
static void
viewprevtag(const char *args[]) {
seltags ^= 1;
tagschanged();
}
static void
keypress(int code) {
int key = -1;
unsigned int len = 1;
char buf[8] = { '\e' };
if (code == '\e') {
/* pass characters following escape to the underlying app */
nodelay(stdscr, TRUE);
for (int t; len < sizeof(buf) && (t = getch()) != ERR; len++) {
if (t > 255) {
key = t;
break;
}
buf[len] = t;
}
nodelay(stdscr, FALSE);
}
for (Client *c = runinall ? nextvisible(clients) : sel; c; c = nextvisible(c->next)) {
if (is_content_visible(c)) {
c->urgent = false;
if (code == '\e')
vt_write(c->term, buf, len);
else
vt_keypress(c->term, code);
if (key != -1)
vt_keypress(c->term, key);
}
if (!runinall)
break;
}
}
static void
mouse_setup(void) {
#ifdef CONFIG_MOUSE
mmask_t mask = 0;
if (mouse_events_enabled) {
mask = BUTTON1_CLICKED | BUTTON2_CLICKED;
for (unsigned int i = 0; i < LENGTH(buttons); i++)
mask |= buttons[i].mask;
}
mousemask(mask, NULL);
#endif /* CONFIG_MOUSE */
}
static bool
checkshell(const char *shell) {
if (shell == NULL || *shell == '\0' || *shell != '/')
return false;
if (!strcmp(strrchr(shell, '/')+1, dvtm_name))
return false;
if (access(shell, X_OK))
return false;
return true;
}
static const char *
getshell(void) {
const char *shell = getenv("SHELL");
struct passwd *pw;
if (checkshell(shell))
return shell;
if ((pw = getpwuid(getuid())) && checkshell(pw->pw_shell))
return pw->pw_shell;
return "/bin/sh";
}
static void
setup(void) {
shell = getshell();
setlocale(LC_CTYPE, "");
initscr();
start_color();
noecho();
nonl();
keypad(stdscr, TRUE);
mouse_setup();
raw();
vt_init();
vt_keytable_set(keytable, LENGTH(keytable));
for (unsigned int i = 0; i < LENGTH(colors); i++) {
if (COLORS == 256) {
if (colors[i].fg256)
colors[i].fg = colors[i].fg256;
if (colors[i].bg256)
colors[i].bg = colors[i].bg256;
}
colors[i].pair = vt_color_reserve(colors[i].fg, colors[i].bg);
}
resize_screen();
struct sigaction sa;
memset(&sa, 0, sizeof sa);
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sa.sa_handler = sigwinch_handler;
sigaction(SIGWINCH, &sa, NULL);
sa.sa_handler = sigchld_handler;
sigaction(SIGCHLD, &sa, NULL);
sa.sa_handler = sigterm_handler;
sigaction(SIGTERM, &sa, NULL);
sa.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &sa, NULL);
}
static void
destroy(Client *c) {
if (sel == c)
focusnextnm(NULL);
detach(c);
detachstack(c);
if (sel == c) {
Client *next = nextvisible(clients);
if (next) {
focus(next);
toggleminimize(NULL);
} else {
sel = NULL;
}
}
if (lastsel == c)
lastsel = NULL;
werase(c->window);
wnoutrefresh(c->window);
vt_destroy(c->term);
delwin(c->window);
if (!clients && LENGTH(actions)) {