/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <curses.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <locale.h>
#include <regex.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "util.h"
#ifdef DEBUG
#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)
#else
#define DPRINTF_D(x)
#define DPRINTF_U(x)
#define DPRINTF_S(x)
#define DPRINTF_P(x)
#endif /* DEBUG */
#define LEN(x) (sizeof(x) / sizeof(*(x)))
#undef MIN
#define MIN(x, y) ((x) < (y) ? (x) : (y))
#define ISODD(x) ((x) & 1)
#define CONTROL(c) ((c) ^ 0x40)
#define TOUPPER(ch) \
(((ch) >= 'a' && (ch) <= 'z') ? ((ch) - 'a' + 'A') : (ch))
#define MAX_CMD_LEN (PATH_MAX << 1)
#define CURSYM(flag) (flag ? CURSR : EMPTY)
struct assoc {
char *regex; /* Regex to match on filename */
char *bin; /* Program */
};
/* Supported actions */
enum action {
SEL_QUIT = 1,
SEL_BACK,
SEL_GOIN,
SEL_FLTR,
SEL_NEXT,
SEL_PREV,
SEL_PGDN,
SEL_PGUP,
SEL_HOME,
SEL_END,
SEL_CD,
SEL_CDHOME,
SEL_TOGGLEDOT,
SEL_DETAIL,
SEL_FSIZE,
SEL_MTIME,
SEL_REDRAW,
SEL_COPY,
SEL_RUN,
SEL_RUNARG,
};
struct key {
int sym; /* Key pressed */
enum action act; /* Action */
char *run; /* Program to run */
char *env; /* Environment variable to run */
};
#include "config.h"
typedef struct entry {
char name[PATH_MAX];
mode_t mode;
time_t t;
off_t size;
} *pEntry;
/* Global context */
struct entry *dents;
int ndents, cur;
int idle;
char *opener = NULL;
char *fallback_opener = NULL;
char *copier = NULL;
const char* size_units[] = {"B", "K", "M", "G", "T", "P", "E", "Z", "Y"};
/*
* Layout:
* .---------
* | cwd: /mnt/path
* |
* | file0
* | file1
* | > file2
* | file3
* | file4
* ...
* | filen
* |
* | Permission denied
* '------
*/
void printmsg(char *);
void printwarn(void);
void printerr(int, char *);
#undef dprintf
int
dprintf(int fd, const char *fmt, ...)
{
char buf[BUFSIZ];
int r;
va_list ap;
va_start(ap, fmt);
r = vsnprintf(buf, sizeof(buf), fmt, ap);
if (r > 0)
r = write(fd, buf, r);
va_end(ap);
return r;
}
void *
xmalloc(size_t size)
{
void *p;
p = malloc(size);
if (p == NULL)
printerr(1, "malloc");
return p;
}
void *
xrealloc(void *p, size_t size)
{
p = realloc(p, size);
if (p == NULL)
printerr(1, "realloc");
return p;
}
char *
xstrdup(const char *s)
{
char *p;
p = strdup(s);
if (p == NULL)
printerr(1, "strdup");
return p;
}
/* Some implementations of dirname(3) may modify `path' and some
* return a pointer inside `path'. */
char *
xdirname(const char *path)
{
static char out[PATH_MAX];
char tmp[PATH_MAX], *p;
strlcpy(tmp, path, sizeof(tmp));
p = dirname(tmp);
if (p == NULL)
printerr(1, "dirname");
strlcpy(out, p, sizeof(out));
return out;
}
void
spawn(char *file, char *arg, char *dir)
{
pid_t pid;
int status;
pid = fork();
if (pid == 0) {
if (dir != NULL)
status = chdir(dir);
execlp(file, file, arg, NULL);
_exit(1);
} else {
/* Ignore interruptions */
while (waitpid(pid, &status, 0) == -1)
DPRINTF_D(status);
DPRINTF_D(pid);
}
}
char *
xgetenv(char *name, char *fallback)
{
char *value;
if (name == NULL)
return fallback;
value = getenv(name);
return value && value[0] ? value : fallback;
}
int
xstricmp(const char *s1, const char *s2)
{
while (*s2 != 0 && TOUPPER(*s1) == TOUPPER(*s2))
s1++, s2++;
/* In case of alphabetically same names, make sure
lower case one comes before upper case one */
if (!*s1 && !*s2)
return 1;
return (int) (TOUPPER(*s1) - TOUPPER(*s2));
}
char *
openwith(char *file)
{
regex_t regex;
char *bin = NULL;
int i;
for (i = 0; i < LEN(assocs); i++) {
if (regcomp(®ex, assocs[i].regex,
REG_NOSUB | REG_EXTENDED | REG_ICASE) != 0)
continue;
if (regexec(®ex, file, 0, NULL, 0) == 0) {
bin = assocs[i].bin;
break;
}
}
DPRINTF_S(bin);
return bin;
}
int
setfilter(regex_t *regex, char *filter)
{
char errbuf[LINE_MAX];
size_t len;
int r;
r = regcomp(regex, filter, REG_NOSUB | REG_EXTENDED | REG_ICASE);
if (r != 0) {
len = COLS;
if (len > sizeof(errbuf))
len = sizeof(errbuf);
regerror(r, regex, errbuf, len);
printmsg(errbuf);
}
return r;
}
void
initfilter(int dot, char **ifilter)
{
*ifilter = dot ? "." : "^[^.]";
}
int
visible(regex_t *regex, char *file)
{
return regexec(regex, file, 0, NULL, 0) == 0;
}
int
entrycmp(const void *va, const void *vb)
{
if (mtimeorder)
return ((pEntry)vb)->t - ((pEntry)va)->t;
if (sizeorder)
return ((pEntry)vb)->size - ((pEntry)va)->size;
return xstricmp(((pEntry)va)->name, ((pEntry)vb)->name);
}
void
initcurses(void)
{
if (initscr() == NULL) {
char *term = getenv("TERM");
if (term != NULL)
fprintf(stderr, "error opening terminal: %s\n", term);
else
fprintf(stderr, "failed to initialize curses\n");
exit(1);
}
cbreak();
noecho();
nonl();
intrflush(stdscr, FALSE);
keypad(stdscr, TRUE);
curs_set(FALSE); /* Hide cursor */
timeout(1000); /* One second */
}
void
exitcurses(void)
{
endwin(); /* Restore terminal */
}
/* Messages show up at the bottom */
void
printmsg(char *msg)
{
move(LINES - 1, 0);
printw("%s\n", msg);
}
/* Display warning as a message */
void
printwarn(void)
{
printmsg(strerror(errno));
}
/* Kill curses and display error before exiting */
void
printerr(int ret, char *prefix)
{
exitcurses();
fprintf(stderr, "%s: %s\n", prefix, strerror(errno));
exit(ret);
}
/* Clear the last line */
void
clearprompt(void)
{
printmsg("");
}
/* Print prompt on the last line */
void
printprompt(char *str)
{
clearprompt();
printw(str);
}
/* Returns SEL_* if key is bound and 0 otherwise.
* Also modifies the run and env pointers (used on SEL_{RUN,RUNARG}) */
int
nextsel(char **run, char **env)
{
int c, i;
c = getch();
if (c == -1)
idle++;
else
idle = 0;
for (i = 0; i < LEN(bindings); i++)
if (c == bindings[i].sym) {
*run = bindings[i].run;
*env = bindings[i].env;
return bindings[i].act;
}
return 0;
}
char *
readln(void)
{
static char ln[LINE_MAX];
timeout(-1);
echo();
curs_set(TRUE);
memset(ln, 0, sizeof(ln));
wgetnstr(stdscr, ln, sizeof(ln) - 1);
noecho();
curs_set(FALSE);
timeout(1000);
return ln[0] ? ln : NULL;
}
int
canopendir(char *path)
{
DIR *dirp;
dirp = opendir(path);
if (dirp == NULL)
return 0;
closedir(dirp);
return 1;
}
char *
mkpath(char *dir, char *name, char *out, size_t n)
{
/* Handle absolute path */
if (name[0] == '/')
strlcpy(out, name, n);
else {
/* Handle root case */
if (strcmp(dir, "/") == 0)
snprintf(out, n, "/%s", name);
else
snprintf(out, n, "%s/%s", dir, name);
}
return out;
}
void
printent(struct entry *ent, int active)
{
if (S_ISDIR(ent->mode))
printw("%s%s/\n", active ? CURSR : EMPTY, ent->name);
else if (S_ISLNK(ent->mode))
printw("%s%s@\n", active ? CURSR : EMPTY, ent->name);
else if (S_ISSOCK(ent->mode))
printw("%s%s=\n", active ? CURSR : EMPTY, ent->name);
else if (S_ISFIFO(ent->mode))
printw("%s%s|\n", active ? CURSR : EMPTY, ent->name);
else if (ent->mode & S_IXUSR)
printw("%s%s*\n", active ? CURSR : EMPTY, ent->name);
else
printw("%s%s\n", active ? CURSR : EMPTY, ent->name);
}
void (*printptr)(struct entry *ent, int active) = &printent;
char*
coolsize(off_t size)
{
static char size_buf[12]; /* Buffer to hold human readable size */
int i = 0;
long double fsize = (double)size;
while (fsize > 1024) {
fsize /= 1024;
i++;
}
snprintf(size_buf, 12, "%.*Lf%s", i, fsize, size_units[i]);
return size_buf;
}
void
printent_long(struct entry *ent, int active)
{
static char buf[18];
const static struct tm *p;
p = localtime(&ent->t);
strftime(buf, 18, "%b %d %H:%M %Y", p);
if (active)
attron(A_REVERSE);
if (S_ISDIR(ent->mode))
printw("%s%-17.17s / %s/\n",
CURSYM(active), buf, ent->name);
else if (S_ISLNK(ent->mode))
printw("%s%-17.17s @ %s@\n",
CURSYM(active), buf, ent->name);
else if (S_ISSOCK(ent->mode))
printw("%s%-17.17s = %s=\n",
CURSYM(active), buf, ent->name);
else if (S_ISFIFO(ent->mode))
printw("%s%-17.17s | %s|\n",
CURSYM(active), buf, ent->name);
else if (S_ISBLK(ent->mode))
printw("%s%-17.17s b %s\n",
CURSYM(active), buf, ent->name);
else if (S_ISCHR(ent->mode))
printw("%s%-17.17s c %s\n",
CURSYM(active), buf, ent->name);
else if (ent->mode & S_IXUSR)
printw("%s%-17.17s %8.8s* %s*\n", CURSYM(active),
buf, coolsize(ent->size), ent->name);
else
printw("%s%-17.17s %8.8s %s\n", CURSYM(active),
buf, coolsize(ent->size), ent->name);
if (active)
attroff(A_REVERSE);
}
int
dentfill(char *path, struct entry **dents,
int (*filter)(regex_t *, char *), regex_t *re)
{
char newpath[PATH_MAX];
DIR *dirp;
struct dirent *dp;
struct stat sb;
int r, n = 0;
dirp = opendir(path);
if (dirp == NULL)
return 0;
while ((dp = readdir(dirp)) != NULL) {
/* Skip self and parent */
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0)
continue;
if (filter(re, dp->d_name) == 0)
continue;
*dents = xrealloc(*dents, (n + 1) * sizeof(**dents));
strlcpy((*dents)[n].name, dp->d_name, sizeof((*dents)[n].name));
/* Get mode flags */
mkpath(path, dp->d_name, newpath, sizeof(newpath));
r = lstat(newpath, &sb);
if (r == -1)
printerr(1, "lstat");
(*dents)[n].mode = sb.st_mode;
(*dents)[n].t = sb.st_mtime;
(*dents)[n].size = sb.st_size;
n++;
}
/* Should never be null */
r = closedir(dirp);
if (r == -1)
printerr(1, "closedir");
return n;
}
void
dentfree(struct entry *dents)
{
free(dents);
}
/* Return the position of the matching entry or 0 otherwise */
int
dentfind(struct entry *dents, int n, char *cwd, char *path)
{
char tmp[PATH_MAX];
int i;
if (path == NULL)
return 0;
for (i = 0; i < n; i++) {
mkpath(cwd, dents[i].name, tmp, sizeof(tmp));
DPRINTF_S(path);
DPRINTF_S(tmp);
if (strcmp(tmp, path) == 0)
return i;
}
return 0;
}
int
populate(char *path, char *oldpath, char *fltr)
{
regex_t re;
int r;
/* Can fail when permissions change while browsing */
if (canopendir(path) == 0)
return -1;
/* Search filter */
r = setfilter(&re, fltr);
if (r != 0)
return -1;
dentfree(dents);
ndents = 0;
dents = NULL;
ndents = dentfill(path, &dents, visible, &re);
qsort(dents, ndents, sizeof(*dents), entrycmp);
/* Find cur from history */
cur = dentfind(dents, ndents, path, oldpath);
return 0;
}
void
redraw(char *path)
{
static char cwd[PATH_MAX];
static int nlines, odd;
static int i;
nlines = MIN(LINES - 4, ndents);
/* Clean screen */
erase();
/* Strip trailing slashes */
for (i = strlen(path) - 1; i > 0; i--)
if (path[i] == '/')
path[i] = '\0';
else
break;
DPRINTF_D(cur);
DPRINTF_S(path);
/* No text wrapping in cwd line */
if (!realpath(path, cwd)) {
printmsg("Cannot resolve path");
return;
}
printw(CWD "%s\n\n", cwd);
/* Print listing */
odd = ISODD(nlines);
if (cur < (nlines >> 1)) {
for (i = 0; i < nlines; i++)
printptr(&dents[i], i == cur);
} else if (cur >= ndents - (nlines >> 1)) {
for (i = ndents - nlines; i < ndents; i++)
printptr(&dents[i], i == cur);
} else {
nlines >>= 1;
for (i = cur - nlines; i < cur + nlines + odd; i++)
printptr(&dents[i], i == cur);
}
if (showdetail) {
if (ndents) {
static char ind;
ind = '\0';
if (S_ISDIR(dents[cur].mode))
ind = '/';
else if (S_ISLNK(dents[cur].mode))
ind = '@';
else if (S_ISSOCK(dents[cur].mode))
ind = '=';
else if (S_ISFIFO(dents[cur].mode))
ind = '|';
else if (dents[cur].mode & S_IXUSR)
ind = '*';
ind ? sprintf(cwd, "%d items [%s%c]",
ndents, dents[cur].name, ind)
: sprintf(cwd, "%d items [%s]",
ndents, dents[cur].name);
printmsg(cwd);
} else
printmsg("0 items");
}
}
void
browse(char *ipath, char *ifilter)
{
static char path[PATH_MAX], oldpath[PATH_MAX], newpath[PATH_MAX];
static char fltr[LINE_MAX];
char *bin, *dir, *tmp, *run, *env;
struct stat sb;
regex_t re;
int r, fd;
strlcpy(path, ipath, sizeof(path));
strlcpy(fltr, ifilter, sizeof(fltr));
oldpath[0] = '\0';
newpath[0] = '\0';
begin:
r = populate(path, oldpath, fltr);
if (r == -1) {
printwarn();
goto nochange;
}
for (;;) {
redraw(path);
nochange:
switch (nextsel(&run, &env)) {
case SEL_QUIT:
dentfree(dents);
return;
case SEL_BACK:
/* There is no going back */
if (strcmp(path, "/") == 0 ||
strcmp(path, ".") == 0 ||
strchr(path, '/') == NULL)
goto nochange;
dir = xdirname(path);
if (canopendir(dir) == 0) {
printwarn();
goto nochange;
}
/* Save history */
strlcpy(oldpath, path, sizeof(oldpath));
strlcpy(path, dir, sizeof(path));
/* Reset filter */
strlcpy(fltr, ifilter, sizeof(fltr));
goto begin;
case SEL_GOIN:
/* Cannot descend in empty directories */
if (ndents == 0)
goto nochange;
mkpath(path, dents[cur].name, newpath, sizeof(newpath));
DPRINTF_S(newpath);
/* Get path info */
fd = open(newpath, O_RDONLY | O_NONBLOCK);
if (fd == -1) {
printwarn();
goto nochange;
}
r = fstat(fd, &sb);
if (r == -1) {
printwarn();
close(fd);
goto nochange;
}
close(fd);
DPRINTF_U(sb.st_mode);
switch (sb.st_mode & S_IFMT) {
case S_IFDIR:
if (canopendir(newpath) == 0) {
printwarn();
goto nochange;
}
strlcpy(path, newpath, sizeof(path));
/* Reset filter */
strlcpy(fltr, ifilter, sizeof(fltr));
goto begin;
case S_IFREG:
{
static char cmd[MAX_CMD_LEN];
static char *runvi = "vi";
static int status;
static FILE *fp;
/* If default mime opener is set, use it */
if (opener) {
snprintf(cmd, MAX_CMD_LEN,
"%s \"%s\" > /dev/null 2>&1",
opener, newpath);
status = system(cmd);
continue;
}
/* Try custom applications */
bin = openwith(newpath);
if (bin == NULL) {
/* If a custom handler application is
not set, open plain text files with
vi, then try fallback_opener */
snprintf(cmd, MAX_CMD_LEN,
"file \"%s\"", newpath);
fp = popen(cmd, "r");
if (fp == NULL)
goto nochange;
if (fgets(cmd, MAX_CMD_LEN, fp) == NULL) {
pclose(fp);
goto nochange;
}
pclose(fp);
if (strstr(cmd, "ASCII text") != NULL)
bin = runvi;
else if (fallback_opener) {
snprintf(cmd, MAX_CMD_LEN,
"%s \"%s\" > \
/dev/null 2>&1",
fallback_opener,
newpath);
status = system(cmd);
continue;
} else {
printmsg("No association");
goto nochange;
}
}
exitcurses();
spawn(bin, newpath, NULL);
initcurses();
continue;
}
default:
printmsg("Unsupported file");
goto nochange;
}
case SEL_FLTR:
/* Read filter */
printprompt("filter: ");
tmp = readln();
if (tmp == NULL)
tmp = ifilter;
/* Check and report regex errors */
r = setfilter(&re, tmp);
if (r != 0)
goto nochange;
strlcpy(fltr, tmp, sizeof(fltr));
DPRINTF_S(fltr);
/* Save current */
if (ndents > 0)
mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
goto begin;
case SEL_NEXT:
if (cur < ndents - 1)
cur++;
else if (ndents)
/* Roll over, set cursor to first entry */
cur = 0;
break;
case SEL_PREV:
if (cur > 0)
cur--;
else if (ndents)
/* Roll over, set cursor to last entry */
cur = ndents - 1;
break;
case SEL_PGDN:
if (cur < ndents - 1)
cur += MIN((LINES - 4) / 2, ndents - 1 - cur);
break;
case SEL_PGUP:
if (cur > 0)
cur -= MIN((LINES - 4) / 2, cur);
break;
case SEL_HOME:
cur = 0;
break;
case SEL_END:
cur = ndents - 1;
break;
case SEL_CD:
/* Read target dir */
printprompt("chdir: ");
tmp = readln();
if (tmp == NULL) {
clearprompt();
goto nochange;
}
mkpath(path, tmp, newpath, sizeof(newpath));
if (canopendir(newpath) == 0) {
printwarn();
goto nochange;
}
strlcpy(path, newpath, sizeof(path));
/* Reset filter */
strlcpy(fltr, ifilter, sizeof(fltr))
DPRINTF_S(path);
goto begin;
case SEL_CDHOME:
tmp = getenv("HOME");
if (tmp == NULL) {
clearprompt();
goto nochange;
}
if (canopendir(tmp) == 0) {
printwarn();
goto nochange;
}
strlcpy(path, tmp, sizeof(path));
/* Reset filter */
strlcpy(fltr, ifilter, sizeof(fltr));
DPRINTF_S(path);
goto begin;
case SEL_TOGGLEDOT:
showhidden ^= 1;
initfilter(showhidden, &ifilter);
strlcpy(fltr, ifilter, sizeof(fltr));
goto begin;
case SEL_DETAIL:
showdetail = !showdetail;
showdetail ? (printptr = &printent_long)
: (printptr = &printent);
/* Save current */
if (ndents > 0)
mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
goto begin;
case SEL_FSIZE:
sizeorder = !sizeorder;
mtimeorder = 0;
/* Save current */
if (ndents > 0)
mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
goto begin;
case SEL_MTIME:
mtimeorder = !mtimeorder;
sizeorder = 0;
/* Save current */
if (ndents > 0)
mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
goto begin;
case SEL_REDRAW:
/* Save current */
if (ndents > 0)
mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
goto begin;
case SEL_COPY:
if (copier && ndents) {
char abspath[PATH_MAX];
if (strcmp(path, "/") == 0)
snprintf(abspath, PATH_MAX, "/%s",
dents[cur].name);
else
snprintf(abspath, PATH_MAX, "%s/%s",
path, dents[cur].name);
spawn(copier, abspath, NULL);
printmsg(abspath);
} else if (!copier)
printmsg("NNN_COPIER is not set");
goto nochange;
case SEL_RUN:
run = xgetenv(env, run);
exitcurses();
spawn(run, NULL, path);
initcurses();
/* Re-populate as directory content may have changed */
goto begin;
case SEL_RUNARG:
run = xgetenv(env, run);
exitcurses();
spawn(run, dents[cur].name, path);
initcurses();
break;
}
/* Screensaver */
if (idletimeout != 0 && idle == idletimeout) {
idle = 0;
exitcurses();
spawn(idlecmd, NULL, NULL);
initcurses();
}
}
}
void
usage(void)
{
fprintf(stderr, "usage: nnn [-d] [dir]\n");
exit(1);
}
int
main(int argc, char *argv[])
{
char cwd[PATH_MAX], *ipath;
char *ifilter;
int opt = 0;
/* Confirm we are in a terminal */
if (!isatty(0) || !isatty(1)) {
fprintf(stderr, "stdin or stdout is not a tty\n");
exit(1);
}
if (argc > 3)
usage();
while ((opt = getopt(argc, argv, "d")) != -1) {
switch (opt) {
case 'd':
/* Open in detail mode, if set */
showdetail = 1;
printptr = &printent_long;
break;
default:
usage();
}
}
if (argc == optind) {
/* Start in the current directory */
ipath = getcwd(cwd, sizeof(cwd));
if (ipath == NULL)
ipath = "/";
} else {
ipath = realpath(argv[optind], cwd);
if (!ipath) {
fprintf(stderr, "%s: no such dir\n", argv[optind]);
exit(1);
}
}
if (getuid() == 0)
showhidden = 1;
initfilter(showhidden, &ifilter);
/* Get the default desktop mime opener, if set */
opener = getenv("NNN_OPENER");
/* Get the fallback desktop mime opener, if set */
fallback_opener = getenv("NNN_FALLBACK_OPENER");
/* Get the default copier, if set */
copier = getenv("NNN_COPIER");
signal(SIGINT, SIG_IGN);
/* Test initial path */
if (canopendir(ipath) == 0) {
fprintf(stderr, "%s: %s\n", ipath, strerror(errno));
exit(1);
}
/* Set locale before curses setup */
setlocale(LC_ALL, "");
initcurses();
browse(ipath, ifilter);
exitcurses();
exit(0);
}