nnn/noice.c

863 lines
14 KiB
C
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
#include <fcntl.h>
#include <dirent.h>
#include <curses.h>
#include <libgen.h>
#include <limits.h>
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#include <locale.h>
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#include <regex.h>
#include <stdarg.h>
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#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <string.h>
#include <unistd.h>
#include "util.h"
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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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#undef MIN
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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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};
/* Supported actions */
enum action {
SEL_QUIT = 1,
SEL_BACK,
SEL_GOIN,
SEL_FLTR,
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SEL_TYPE,
SEL_NEXT,
SEL_PREV,
SEL_PGDN,
SEL_PGUP,
SEL_SH,
SEL_CD,
SEL_MTIME,
};
struct key {
int sym; /* Key pressed */
enum action act; /* Action */
};
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#include "config.h"
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struct entry {
char *name;
mode_t mode;
time_t t;
};
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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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* '------
*/
void printmsg(char *msg);
void printwarn(void);
void printerr(int ret, char *prefix);
char *makepath(char *dir, char *name);
#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)
write(fd, buf, r);
va_end(ap);
return r;
}
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void *
xmalloc(size_t size)
{
void *p;
p = malloc(size);
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if (p == NULL)
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printerr(1, "malloc");
return p;
}
void *
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xrealloc(void *p, size_t size)
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{
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p = realloc(p, size);
if (p == NULL)
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printerr(1, "realloc");
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return p;
}
char *
xstrdup(const char *s)
{
char *p;
p = strdup(s);
if (p == NULL)
printerr(1, "strdup");
return p;
}
char *
xdirname(const char *path)
{
char *p, *tmp;
/* Some implementations of dirname(3) may modify `path' and some
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* return a pointer inside `path' and we cannot free(3) the
* original string if we lose track of it. */
tmp = xstrdup(path);
p = dirname(tmp);
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if (p == NULL) {
free(tmp);
printerr(1, "dirname");
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}
/* Make sure this is a malloc(3)-ed string */
p = xstrdup(p);
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free(tmp);
return p;
}
void
spawn(const char *file, const char *arg, const char *dir)
{
pid_t pid;
int status;
pid = fork();
if (pid == 0) {
if (dir != NULL)
chdir(dir);
execlp(file, file, arg, NULL);
_exit(1);
} else {
/* Ignore interruptions */
while (waitpid(pid, &status, 0) == -1)
DPRINTF_D(status);
DPRINTF_D(pid);
}
}
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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) == 0) {
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) {
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errbuf = xmalloc(COLS * sizeof(char));
regerror(r, regex, errbuf, COLS * sizeof(char));
printmsg(errbuf);
free(errbuf);
}
return r;
}
int
visible(regex_t *regex, char *file)
{
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return regexec(regex, file, 0, NULL, 0) == 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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if (mtimeorder)
return b->t - a->t;
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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fprintf(stderr, "%s: %s\n", prefix, strerror(errno));
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exit(ret);
}
/* Clear the last line */
void
clearprompt(void)
{
printmsg("");
}
/* Print prompt on the last line */
void
printprompt(char *str)
{
clearprompt();
printw(str);
}
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/* Returns SEL_* if key is bound and 0 otherwise */
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int
nextsel(void)
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{
int c, i;
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c = getch();
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for (i = 0; i < LEN(bindings); i++)
if (c == bindings[i].sym)
return bindings[i].act;
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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;
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while ((c = getch()) != ERR) {
if (c == KEY_ENTER || c == '\r')
break;
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if (c == KEY_BACKSPACE || c == CONTROL('H')) {
getyx(stdscr, y, x);
if (x >= x0) {
i--;
if (i > 0) {
ln = xrealloc(ln, i * sizeof(*ln));
} else {
free(ln);
ln = NULL;
}
move(y, x);
printw("%c", ' ');
move(y, x);
} else {
move(y, x0);
}
continue;
}
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ln = xrealloc(ln, (i + 1) * sizeof(*ln));
ln[i] = c;
i++;
}
if (ln != NULL) {
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ln = xrealloc(ln, (i + 1) * sizeof(*ln));
ln[i] = '\0';
}
curs_set(FALSE);
noecho();
return ln;
}
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/*
* Read one key and modify the provided string accordingly.
* Returns 0 when more input is expected and 1 on completion.
*/
int
readmore(char **str)
{
int c, ret = 0;
size_t i;
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char *ln = *str;
if (ln != NULL)
i = strlen(ln);
else
i = 0;
DPRINTF_D(i);
curs_set(TRUE);
c = getch();
switch (c) {
case KEY_ENTER:
case '\r':
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ret = 1;
break;
case KEY_BACKSPACE:
case CONTROL('H'):
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i--;
if (i > 0) {
ln = xrealloc(ln, (i + 1) * sizeof(*ln));
ln[i] = '\0';
} else {
free(ln);
ln = NULL;
}
break;
default:
i++;
ln = xrealloc(ln, (i + 1) * sizeof(*ln));
ln[i - 1] = c;
ln[i] = '\0';
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}
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curs_set(FALSE);
*str = ln;
return ret;
}
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int
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canopendir(char *path)
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{
DIR *dirp;
dirp = opendir(path);
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if (dirp == NULL)
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return 0;
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closedir(dirp);
return 1;
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}
void
printent(struct entry *ent, int active)
{
char *name;
unsigned int maxlen = COLS - strlen(CURSR) - 1;
char cm = 0;
/* Copy name locally */
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name = xstrdup(ent->name);
if (S_ISDIR(ent->mode)) {
cm = '/';
maxlen--;
} else if (S_ISLNK(ent->mode)) {
cm = '@';
maxlen--;
} else if (S_ISSOCK(ent->mode)) {
cm = '=';
maxlen--;
} else if (S_ISFIFO(ent->mode)) {
cm = '|';
maxlen--;
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} else if (ent->mode & S_IXUSR) {
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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int
dentfill(char *path, struct entry **dents,
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int (*filter)(regex_t *, char *), regex_t *re)
{
DIR *dirp;
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struct dirent *dp;
struct stat sb;
char *newpath;
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int r, n = 0;
dirp = opendir(path);
if (dirp == NULL)
return 0;
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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));
(*dents)[n].name = xstrdup(dp->d_name);
/* Get mode flags */
newpath = makepath(path, dp->d_name);
r = lstat(newpath, &sb);
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if (r == -1)
printerr(1, "lstat");
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(*dents)[n].mode = sb.st_mode;
(*dents)[n].t = sb.st_mtime;
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n++;
}
/* Should never be null */
r = closedir(dirp);
if (r == -1)
printerr(1, "closedir");
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return n;
}
void
dentfree(struct entry *dents, int n)
{
int i;
for (i = 0; i < n; i++)
free(dents[i].name);
free(dents);
}
char *
makepath(char *dir, char *name)
{
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char path[PATH_MAX];
/* Handle absolute path */
if (name[0] == '/') {
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strlcpy(path, name, sizeof(path));
} else {
/* Handle root case */
if (strcmp(dir, "/") == 0) {
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strlcpy(path, "/", sizeof(path));
strlcat(path, name, sizeof(path));
} else {
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strlcpy(path, dir, sizeof(path));
strlcat(path, "/", sizeof(path));
strlcat(path, name, sizeof(path));
}
}
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return xstrdup(path);
}
/* Return the position of the matching entry or 0 otherwise */
int
dentfind(struct entry *dents, int n, char *cwd, char *path)
{
int i;
char *tmp;
if (path == NULL)
return 0;
for (i = 0; i < n; i++) {
tmp = makepath(cwd, dents[i].name);
DPRINTF_S(path);
DPRINTF_S(tmp);
if (strcmp(tmp, path) == 0) {
free(tmp);
return i;
}
free(tmp);
}
return 0;
}
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void
browse(const char *ipath, const char *ifilter)
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{
struct entry *dents;
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int i, n, cur, r, fd;
int nlines, odd;
char *path = xstrdup(ipath);
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char *filter = xstrdup(ifilter);
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regex_t filter_re, re;
char *cwd, *newpath, *oldpath = NULL;
struct stat sb;
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char *name, *bin, *dir, *tmp;
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int nowtyping = 0;
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begin:
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/* Path and filter should be malloc(3)-ed strings at all times */
n = 0;
dents = NULL;
if (canopendir(path) == 0) {
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printwarn();
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goto nochange;
}
/* Search filter */
r = setfilter(&filter_re, filter);
if (r != 0)
goto nochange;
n = dentfill(path, &dents, visible, &filter_re);
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qsort(dents, n, sizeof(*dents), entrycmp);
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/* Find cur from history */
cur = dentfind(dents, n, path, oldpath);
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free(oldpath);
oldpath = NULL;
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for (;;) {
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nlines = MIN(LINES - 4, n);
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/* Clean screen */
erase();
/* Strip trailing slashes */
for (i = strlen(path) - 1; i > 0; i--)
if (path[i] == '/')
path[i] = '\0';
else
break;
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DPRINTF_D(cur);
DPRINTF_S(path);
/* No text wrapping in cwd line */
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cwd = xmalloc(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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/* Handle filter-as-you-type mode */
if (nowtyping)
goto moretyping;
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nochange:
switch (nextsel()) {
case SEL_QUIT:
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free(path);
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free(filter);
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dentfree(dents, n);
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return;
case SEL_BACK:
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/* There is no going back */
if (strcmp(path, "/") == 0 ||
strcmp(path, ".") == 0 ||
strchr(path, '/') == NULL)
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goto nochange;
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if (canopendir(path) == 0) {
printwarn();
goto nochange;
}
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dir = xdirname(path);
/* Save history */
oldpath = path;
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path = dir;
/* Reset filter */
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free(filter);
filter = xstrdup(ifilter);
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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;
newpath = makepath(path, name);
DPRINTF_S(newpath);
/* Get path info */
fd = open(newpath, O_RDONLY | O_NONBLOCK);
if (fd == -1) {
printwarn();
free(newpath);
goto nochange;
}
r = fstat(fd, &sb);
if (r == -1) {
printwarn();
close(fd);
free(newpath);
goto nochange;
}
close(fd);
DPRINTF_U(sb.st_mode);
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switch (sb.st_mode & S_IFMT) {
case S_IFDIR:
if (canopendir(newpath) == 0) {
printwarn();
free(newpath);
goto nochange;
}
free(path);
path = newpath;
/* Reset filter */
free(filter);
filter = xstrdup(ifilter);
goto out;
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case S_IFREG:
bin = openwith(newpath);
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if (bin == NULL) {
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printmsg("No association");
free(newpath);
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goto nochange;
}
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exitcurses();
spawn(bin, newpath, NULL);
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initcurses();
free(newpath);
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continue;
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default:
printmsg("Unsupported file");
goto nochange;
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}
case SEL_FLTR:
/* Read filter */
printprompt("filter: ");
tmp = readln();
if (tmp == NULL)
tmp = xstrdup(ifilter);
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/* Check and report regex errors */
r = setfilter(&re, tmp);
if (r != 0) {
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free(tmp);
goto nochange;
}
free(filter);
filter = tmp;
DPRINTF_S(filter);
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/* Save current */
if (n > 0)
oldpath = makepath(path, dents[cur].name);
goto out;
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case SEL_TYPE:
nowtyping = 1;
tmp = NULL;
moretyping:
printprompt("type: ");
if (tmp != NULL)
printw("%s", tmp);
r = readmore(&tmp);
DPRINTF_D(r);
DPRINTF_S(tmp);
if (r == 1)
nowtyping = 0;
/* Check regex errors */
if (tmp != NULL) {
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r = setfilter(&re, tmp);
if (r != 0)
if (nowtyping) {
goto moretyping;
} else {
free(tmp);
goto nochange;
}
}
2015-01-27 08:47:57 +00:00
/* Copy or reset filter */
free(filter);
if (tmp != NULL)
filter = xstrdup(tmp);
else
filter = xstrdup(ifilter);
/* Save current */
if (n > 0)
oldpath = makepath(path, dents[cur].name);
if (!nowtyping)
free(tmp);
goto out;
case SEL_NEXT:
if (cur < n - 1)
cur++;
break;
case SEL_PREV:
if (cur > 0)
cur--;
break;
case SEL_PGDN:
if (cur < n - 1)
cur += MIN((LINES - 4) / 2, n - 1 - cur);
break;
case SEL_PGUP:
if (cur > 0)
cur -= MIN((LINES - 4) / 2, cur);
break;
case SEL_SH:
exitcurses();
spawn("/bin/sh", NULL, path);
initcurses();
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break;
case SEL_CD:
/* Read target dir */
printprompt("chdir: ");
tmp = readln();
if (tmp == NULL) {
clearprompt();
goto nochange;
}
newpath = makepath(path, tmp);
free(tmp);
if (canopendir(newpath) == 0) {
free(newpath);
printwarn();
goto nochange;
}
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free(path);
path = newpath;
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free(filter);
filter = xstrdup(ifilter); /* Reset filter */
DPRINTF_S(path);
goto out;
case SEL_MTIME:
mtimeorder = !mtimeorder;
goto out;
}
2014-10-07 06:05:30 +00:00
}
out:
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dentfree(dents, n);
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goto begin;
}
int
main(int argc, char *argv[])
{
char cwd[PATH_MAX], *ipath;
2014-10-21 11:03:53 +00:00
char *ifilter;
if (getuid() == 0)
2014-11-25 15:20:06 +00:00
ifilter = ".";
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else
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ifilter = "^[^.]"; /* Hide dotfiles */
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if (argv[1] != NULL) {
ipath = argv[1];
} else {
ipath = getcwd(cwd, sizeof(cwd));
if (ipath == NULL)
ipath = "/";
}
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/* Test initial path */
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if (canopendir(ipath) == 0)
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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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2014-10-07 11:37:23 +00:00
exitcurses();
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return 0;
}