nnn/noice.c

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9.8 KiB
C
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#include <sys/stat.h>
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#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <curses.h>
#include <libgen.h>
#include <locale.h>
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#include <regex.h>
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#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
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#ifdef LINUX
#include <bsd/string.h>
#endif
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#ifdef DEBUG
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#define DEBUG_FD 8
#define DPRINTF_D(x) dprintf(DEBUG_FD, #x "=%d\n", x)
#define DPRINTF_U(x) dprintf(DEBUG_FD, #x "=%u\n", x)
#define DPRINTF_S(x) dprintf(DEBUG_FD, #x "=%s\n", x)
#define DPRINTF_P(x) dprintf(DEBUG_FD, #x "=0x%p\n", x)
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#else
#define DPRINTF_D(x)
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#define DPRINTF_U(x)
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#define DPRINTF_S(x)
#define DPRINTF_P(x)
#endif /* DEBUG */
#define LEN(x) (sizeof(x) / sizeof(*(x)))
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#define MIN(x, y) ((x) < (y) ? (x) : (y))
#define ISODD(x) ((x) & 1)
#define CONTROL(c) ((c) ^ 0x40)
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struct assoc {
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char *regex; /* Regex to match on filename */
char *bin; /* Program */
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};
/* Configuration */
struct assoc assocs[] = {
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{ "\\.(avi|mp4|mkv|mp3|ogg)$", "mplayer" },
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{ "\\.(png|jpg|gif)$", "feh" },
{ "\\.(html|svg)$", "firefox" },
{ "\\.pdf$", "mupdf" },
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{ "\\.sh$", "sh" },
{ ".*", "less" },
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};
struct entry {
char *name;
mode_t mode;
};
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#define CWD "cwd: "
#define CURSR " > "
#define EMPTY " "
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/*
* Layout:
* .---------
* | cwd: /mnt/path
* |
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* | file0
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* | file1
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* | > file2
* | file3
* | file4
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* ...
* | filen
* |
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* | Permission denied
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* '------
*/
int die = 0;
void printmsg(char *msg);
void printwarn(void);
void printerr(int ret, char *prefix);
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char *
openwith(char *file)
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{
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regex_t regex;
char *bin = NULL;
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int i;
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for (i = 0; i < LEN(assocs); i++) {
if (regcomp(&regex, assocs[i].regex,
REG_NOSUB | REG_EXTENDED) != 0)
continue;
if (regexec(&regex, file, 0, NULL, 0) != REG_NOMATCH) {
bin = assocs[i].bin;
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break;
}
}
DPRINTF_S(bin);
return bin;
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}
int
setfilter(regex_t *regex, char *filter)
{
char *errbuf;
int r;
r = regcomp(regex, filter, REG_NOSUB | REG_EXTENDED);
if (r != 0) {
errbuf = malloc(COLS * sizeof(char));
regerror(r, regex, errbuf, COLS * sizeof(char));
printmsg(errbuf);
free(errbuf);
}
return r;
}
int
visible(regex_t *regex, char *file)
{
if (regexec(regex, file, 0, NULL, 0) != REG_NOMATCH)
return 1;
return 0;
}
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int
entrycmp(const void *va, const void *vb)
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{
const struct entry *a, *b;
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a = (struct entry *)va;
b = (struct entry *)vb;
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return strcmp(a->name, b->name);
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}
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void
initcurses(void)
{
initscr();
cbreak();
noecho();
nonl();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
curs_set(FALSE); /* Hide cursor */
}
void
exitcurses(void)
{
endwin(); /* Restore terminal */
}
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/* Messages show up at the bottom */
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void
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printmsg(char *msg)
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{
move(LINES - 1, 0);
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printw("%s\n", msg);
}
/* Display warning as a message */
void
printwarn(void)
{
printmsg(strerror(errno));
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}
/* Kill curses and display error before exiting */
void
printerr(int ret, char *prefix)
{
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exitcurses();
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printf("%s: %s\n", prefix, strerror(errno));
exit(ret);
}
/*
* Returns 0 normally
* On movement it updates *cur
* Returns SEL_{QUIT,BACK,GOIN,FLTR} otherwise
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*/
#define SEL_QUIT 1
#define SEL_BACK 2
#define SEL_GOIN 3
#define SEL_FLTR 4
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int
nextsel(int *cur, int max)
{
int c;
c = getch();
switch (c) {
case 'q':
return SEL_QUIT;
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/* Back */
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case KEY_BACKSPACE:
case KEY_LEFT:
case 'h':
return SEL_BACK;
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/* Inside */
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case KEY_ENTER:
case '\r':
case KEY_RIGHT:
case 'l':
return SEL_GOIN;
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/* Filter */
case '/':
case '&':
return SEL_FLTR;
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/* Next */
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case 'j':
case KEY_DOWN:
case CONTROL('N'):
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if (*cur < max - 1)
(*cur)++;
break;
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/* Previous */
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case 'k':
case KEY_UP:
case CONTROL('P'):
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if (*cur > 0)
(*cur)--;
break;
}
return 0;
}
char *
readln(void)
{
int c;
int i = 0;
char *ln = NULL;
int y, x, x0;
echo();
curs_set(TRUE);
/* Starting point */
getyx(stdscr, y, x);
x0 = x;
while (c = getch()) {
if (c == KEY_ENTER || c == '\r')
break;
if (c == KEY_BACKSPACE) {
getyx(stdscr, y, x);
if (x >= x0) {
ln = realloc(ln, (i - 1) * sizeof(*ln));
i--;
move(y, x);
printw("%c", ' ');
move(y, x);
} else {
move(y, x0);
}
continue;
}
ln = realloc(ln, (i + 1) * sizeof(*ln));
ln[i] = c;
i++;
}
if (ln != NULL) {
ln = realloc(ln, (i + 1) * sizeof(*ln));
ln[i] = '\0';
}
curs_set(FALSE);
noecho();
return ln;
}
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int
testopendir(char *path)
{
DIR *dirp;
dirp = opendir(path);
if (dirp == NULL) {
return 0;
} else {
closedir(dirp);
return 1;
}
}
void
printent(struct entry *ent, int active)
{
char *name;
unsigned int maxlen = COLS - strlen(CURSR) - 1;
char cm = 0;
/* Copy name locally */
name = strdup(ent->name);
if (name == NULL)
printerr(1, "strdup name");
if (S_ISDIR(ent->mode)) {
cm = '/';
maxlen--;
} else if (S_ISLNK(ent->mode)) {
cm = '@';
maxlen--;
}
/* No text wrapping in entries */
if (strlen(name) > maxlen)
name[maxlen] = '\0';
if (cm == 0)
printw("%s%s\n", active ? CURSR : EMPTY, name);
else
printw("%s%s%c\n", active ? CURSR : EMPTY, name, cm);
free(name);
}
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void
browse(const char *ipath, const char *ifilter)
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{
DIR *dirp;
int dfd;
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struct dirent *dp;
struct entry *dents;
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int i, n, cur;
int r, ret;
char *path = strdup(ipath);
char *filter = strdup(ifilter);
regex_t filter_re;
char *cwd;
struct stat sb;
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begin:
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/* Path and filter should be malloc(3)-ed strings at all times */
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n = 0;
cur = 0;
dents = NULL;
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dirp = opendir(path);
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if (dirp == NULL) {
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printwarn();
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goto nochange;
}
/* Search filter */
r = setfilter(&filter_re, filter);
if (r != 0)
goto nochange;
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while ((dp = readdir(dirp)) != NULL) {
char *name;
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/* Skip self and parent */
if (strcmp(dp->d_name, ".") == 0
|| strcmp(dp->d_name, "..") == 0)
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continue;
if (!visible(&filter_re, dp->d_name))
continue;
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/* Deep copy because readdir(3) reuses the entries */
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dents = realloc(dents, (n + 1) * sizeof(*dents));
if (dents == NULL)
printerr(1, "realloc");
dents[n].name = strdup(dp->d_name);
if (dents[n].name == NULL)
printerr(1, "strdup");
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/* Handle root case */
if (strcmp(path, "/") == 0)
asprintf(&name, "/%s", dents[n].name);
else
asprintf(&name, "%s/%s", path, dents[n].name);
/* Get mode flags */
r = lstat(name, &sb);
free(name);
if (r == -1)
printerr(1, "stat");
dents[n].mode = sb.st_mode;
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n++;
}
qsort(dents, n, sizeof(*dents), entrycmp);
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for (;;) {
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int nlines;
int maxlen;
int odd;
char *pathnew;
char *name;
char *bin;
pid_t pid;
int fd;
char *dir;
char *tmp;
regex_t re;
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redraw:
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nlines = MIN(LINES - 4, n);
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/* Clean screen */
erase();
/* Strip trailing slashes */
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for (i = strlen(path) - 1; i > 0; i--)
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if (path[i] == '/')
path[i] = '\0';
else
break;
DPRINTF_D(cur);
DPRINTF_S(path);
/* No text wrapping in cwd line */
cwd = malloc(COLS * sizeof(char));
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strlcpy(cwd, path, COLS * sizeof(char));
cwd[COLS - strlen(CWD) - 1] = '\0';
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printw(CWD "%s\n\n", cwd);
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/* Print listing */
odd = ISODD(nlines);
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if (cur < nlines / 2) {
for (i = 0; i < nlines; i++)
printent(&dents[i], i == cur);
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} else if (cur >= n - nlines / 2) {
for (i = n - nlines; i < n; i++)
printent(&dents[i], i == cur);
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} else {
for (i = cur - nlines / 2;
i < cur + nlines / 2 + odd; i++)
printent(&dents[i], i == cur);
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}
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nochange:
ret = nextsel(&cur, n);
switch (ret) {
case SEL_QUIT:
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free(path);
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free(filter);
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return;
case SEL_BACK:
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/* There is no going back */
if (strcmp(path, "/") == 0) {
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goto nochange;
} else {
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dir = dirname(path);
tmp = malloc(strlen(dir) + 1);
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strlcpy(tmp, dir, strlen(dir) + 1);
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free(path);
path = tmp;
free(filter);
filter = strdup(ifilter); /* Reset filter */
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goto out;
}
case SEL_GOIN:
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/* Cannot descend in empty directories */
if (n == 0)
goto nochange;
name = dents[cur].name;
/* Handle root case */
if (strcmp(path, "/") == 0)
asprintf(&pathnew, "/%s", name);
else
asprintf(&pathnew, "%s/%s", path, name);
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DPRINTF_S(name);
DPRINTF_S(pathnew);
/* Get path info */
fd = open(pathnew, O_RDONLY | O_NONBLOCK);
if (fd == -1) {
printwarn();
free(pathnew);
goto nochange;
}
r = fstat(fd, &sb);
close(fd);
if (r == -1) {
printwarn();
free(pathnew);
goto nochange;
}
DPRINTF_U(sb.st_mode);
/* Directory */
if (S_ISDIR(sb.st_mode)) {
free(path);
path = pathnew;
free(filter);
filter = strdup(ifilter); /* Reset filter */
goto out;
}
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/* Regular file */
if (S_ISREG(sb.st_mode)) {
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/* Open with */
bin = openwith(name);
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if (bin == NULL) {
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printmsg("No association");
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free(pathnew);
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goto nochange;
}
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exitcurses();
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/* Run program */
pid = fork();
if (pid == 0)
execlp(bin, bin, pathnew, NULL);
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else
waitpid(pid, NULL, 0);
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initcurses();
free(pathnew);
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goto redraw;
}
/* All the rest */
printmsg("Unsupported file");
free(pathnew);
goto nochange;
case SEL_FLTR:
/* Read filter */
move(LINES - 1, 0);
printw("filter: ");
tmp = readln();
if (tmp == NULL) {
printmsg("");
goto nochange;
}
r = setfilter(&re, tmp);
if (r != 0) {
printmsg("");
goto nochange;
}
free(filter);
filter = tmp;
filter_re = re;
DPRINTF_S(filter);
goto out;
}
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}
out:
for (i = 0; i < n; i++)
free(dents[i].name);
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free(dents);
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/* Should never be null */
r = closedir(dirp);
if (r == -1)
printerr(1, "closedir");
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goto begin;
}
int
main(int argc, char *argv[])
{
char *ipath = argv[1] != NULL ? argv[1] : "/";
char *ifilter = "^[^.].*"; /* Hide dotfiles */
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/* Test initial path */
if (!testopendir(ipath))
printerr(1, ipath);
/* Set locale before curses setup */
setlocale(LC_ALL, "");
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initcurses();
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browse(ipath, ifilter);
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exitcurses();
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return 0;
}