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smol/src/browser.c

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/**************************************************************************
* browser.c *
* *
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, *
* 2010, 2011, 2013, 2014, 2015 Free Software Foundation, Inc. *
* *
* 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, 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, write to the Free Software *
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *
* 02110-1301, USA. *
* *
**************************************************************************/
#include "proto.h"
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#ifndef DISABLE_BROWSER
static char **filelist = NULL;
/* The list of files to display in the file browser. */
static size_t filelist_len = 0;
/* The number of files in the list. */
static int width = 0;
/* The number of files that we can display per line. */
static int longest = 0;
/* The number of columns in the longest filename in the list. */
static size_t selected = 0;
/* The currently selected filename in the list; zero-based. */
static char *path_save = NULL;
/* A copy of the current path. */
/* Our main file browser function. path is the tilde-expanded path we
* start browsing from. */
char *do_browser(char *path, DIR *dir)
{
char *retval = NULL;
int kbinput;
bool old_const_update = ISSET(CONST_UPDATE);
char *prev_dir = NULL;
/* The directory we were in before backing up to "..". */
size_t old_selected;
/* The selected file we had before the current selected file. */
functionptrtype func;
/* The function of the key the user typed in. */
/* Don't show a cursor in the file list. */
curs_set(0);
blank_statusbar();
bottombars(MBROWSER);
wnoutrefresh(bottomwin);
UNSET(CONST_UPDATE);
change_browser_directory:
/* We go here after we select a new directory. */
/* Start with no key pressed. */
kbinput = ERR;
path = mallocstrassn(path, get_full_path(path));
/* Save the current path in order to be used later. */
path_save = path;
assert(path != NULL && path[strlen(path) - 1] == '/');
/* Get the file list, and set longest and width in the process. */
browser_init(path, dir);
assert(filelist != NULL);
/* Sort the file list. */
qsort(filelist, filelist_len, sizeof(char *), diralphasort);
/* If prev_dir isn't NULL, select the directory saved in it, and
* then blow it away. */
if (prev_dir != NULL) {
browser_select_dirname(prev_dir);
free(prev_dir);
prev_dir = NULL;
/* Otherwise, select the first file or directory in the list. */
} else
selected = 0;
old_selected = (size_t)-1;
titlebar(path);
while (TRUE) {
struct stat st;
int i;
size_t fileline = selected / width;
/* The line number the selected file is on. */
char *new_path;
/* The path we switch to at the "Go to Directory"
* prompt. */
/* Make sure that the cursor is off. */
curs_set(0);
#ifndef NANO_TINY
if (kbinput == KEY_WINCH) {
/* Rebuild the file list and sort it. */
browser_init(path_save, opendir(path_save));
qsort(filelist, filelist_len, sizeof(char *), diralphasort);
/* Make sure the selected file is within range. */
if (selected >= filelist_len)
selected = filelist_len - 1;
kbinput = ERR;
}
#endif
/* Display (or redisplay) the file list if we don't have a key yet,
* or the list has changed, or the selected file has changed. */
if (kbinput == ERR || old_selected != selected)
browser_refresh();
old_selected = selected;
kbinput = get_kbinput(edit);
#ifndef NANO_TINY
if (kbinput == KEY_WINCH)
continue;
#endif
#ifndef DISABLE_MOUSE
if (kbinput == KEY_MOUSE) {
int mouse_x, mouse_y;
/* We can click on the edit window to select a
* filename. */
if (get_mouseinput(&mouse_x, &mouse_y, TRUE) == 0 &&
wmouse_trafo(edit, &mouse_y, &mouse_x, FALSE)) {
/* longest is the width of each column. There
* are two spaces between each column. */
selected = (fileline / editwinrows) *
(editwinrows * width) + (mouse_y *
width) + (mouse_x / (longest + 2));
/* If they clicked beyond the end of a row,
* select the last filename in that row. */
if (mouse_x > width * (longest + 2))
selected--;
/* If we're off the screen, select the last filename. */
if (selected > filelist_len - 1)
selected = filelist_len - 1;
/* If we selected the same filename as last time,
* put back the Enter key so that it's read in. */
if (old_selected == selected)
unget_kbinput(sc_seq_or(do_enter, 0), FALSE, FALSE);
}
}
#endif /* !DISABLE_MOUSE */
func = parse_browser_input(&kbinput);
if (func == total_refresh) {
total_redraw();
} else if (func == do_help_void) {
#ifndef DISABLE_HELP
do_help_void();
/* The window dimensions might have changed, so act as if. */
kbinput = KEY_WINCH;
#else
say_there_is_no_help();
#endif
} else if (func == do_search) {
/* Search for a filename. */
do_filesearch();
} else if (func == do_research) {
/* Search for another filename. */
do_fileresearch();
} else if (func == do_page_up) {
if (selected >= (editwinrows + fileline % editwinrows) * width)
selected -= (editwinrows + fileline % editwinrows) * width;
else
selected = 0;
} else if (func == do_page_down) {
selected += (editwinrows - fileline % editwinrows) * width;
if (selected > filelist_len - 1)
selected = filelist_len - 1;
} else if (func == do_first_file) {
selected = 0;
} else if (func == do_last_file) {
selected = filelist_len - 1;
} else if (func == goto_dir_void) {
/* Go to a specific directory. */
i = do_prompt(TRUE,
#ifndef DISABLE_TABCOMP
FALSE,
#endif
MGOTODIR, NULL,
#ifndef DISABLE_HISTORIES
NULL,
#endif
/* TRANSLATORS: This is a prompt. */
browser_refresh, _("Go To Directory"));
bottombars(MBROWSER);
/* If the directory begins with a newline (i.e. an
* encoded null), treat it as though it's blank. */
if (i < 0 || *answer == '\n') {
statusbar(_("Cancelled"));
continue;
}
/* Convert newlines to nulls in the directory name. */
sunder(answer);
align(&answer);
new_path = real_dir_from_tilde(answer);
if (new_path[0] != '/') {
new_path = charealloc(new_path, strlen(path) +
strlen(answer) + 1);
sprintf(new_path, "%s%s", path, answer);
}
#ifndef DISABLE_OPERATINGDIR
if (check_operating_dir(new_path, FALSE)) {
/* TRANSLATORS: This refers to the option --operatingdir,
* not to --restricted. */
statusbar(_("Can't go outside of %s in confined mode"),
operating_dir);
free(new_path);
continue;
}
#endif
dir = opendir(new_path);
if (dir == NULL) {
/* We can't open this directory for some reason.
* Complain. */
statusbar(_("Error reading %s: %s"), answer,
strerror(errno));
beep();
free(new_path);
continue;
}
/* Start over again with the new path value. */
free(path);
path = new_path;
goto change_browser_directory;
} else if (func == do_up_void) {
if (selected >= width)
selected -= width;
} else if (func == do_down_void) {
if (selected + width <= filelist_len - 1)
selected += width;
} else if (func == do_left) {
if (selected > 0)
selected--;
} else if (func == do_right) {
if (selected < filelist_len - 1)
selected++;
} else if (func == do_enter) {
/* We can't move up from "/". */
if (strcmp(filelist[selected], "/..") == 0) {
statusbar(_("Can't move up a directory"));
beep();
continue;
}
#ifndef DISABLE_OPERATINGDIR
/* Note: The selected file can be outside the operating
* directory if it's ".." or if it's a symlink to a
* directory outside the operating directory. */
if (check_operating_dir(filelist[selected], FALSE)) {
statusbar(_("Can't go outside of %s in confined mode"),
operating_dir);
beep();
continue;
}
#endif
if (stat(filelist[selected], &st) == -1) {
/* We can't open this file for some reason.
* Complain. */
statusbar(_("Error reading %s: %s"),
filelist[selected], strerror(errno));
beep();
continue;
}
if (!S_ISDIR(st.st_mode)) {
/* We've successfully opened a file, we're done, so
* get out. */
retval = mallocstrcpy(NULL, filelist[selected]);
break;
}
dir = opendir(filelist[selected]);
if (dir == NULL) {
statusbar(_("Error reading %s: %s"),
filelist[selected], strerror(errno));
beep();
continue;
}
/* If we moved up one level, remember where we came from, so
* this directory can be highlighted and easily reentered. */
if (strcmp(tail(filelist[selected]), "..") == 0)
prev_dir = striponedir(filelist[selected]);
path = mallocstrcpy(path, filelist[selected]);
/* Start over again with the new path value. */
goto change_browser_directory;
} else if (func == do_exit) {
/* Exit from the file browser. */
break;
} else
unbound_key(kbinput);
}
titlebar(NULL);
edit_refresh();
if (old_const_update)
SET(CONST_UPDATE);
free(path);
free_chararray(filelist, filelist_len);
filelist = NULL;
filelist_len = 0;
return retval;
}
/* The file browser front end. We check to see if inpath has a
* directory in it. If it does, we start do_browser() from there.
* Otherwise, we start do_browser() from the current directory. */
char *do_browse_from(const char *inpath)
{
struct stat st;
char *path;
/* This holds the tilde-expanded version of inpath. */
DIR *dir = NULL;
assert(inpath != NULL);
path = real_dir_from_tilde(inpath);
/* Perhaps path is a directory. If so, we'll pass it to
* do_browser(). Or perhaps path is a directory / a file. If so,
* we'll try stripping off the last path element and passing it to
* do_browser(). Or perhaps path doesn't have a directory portion
* at all. If so, we'll just pass the current directory to
* do_browser(). */
if (stat(path, &st) == -1 || !S_ISDIR(st.st_mode)) {
path = mallocstrassn(path, striponedir(path));
if (stat(path, &st) == -1 || !S_ISDIR(st.st_mode)) {
free(path);
path = charalloc(PATH_MAX + 1);
path = getcwd(path, PATH_MAX + 1);
if (path != NULL)
align(&path);
}
}
#ifndef DISABLE_OPERATINGDIR
/* If the resulting path isn't in the operating directory, use
* the operating directory instead. */
if (check_operating_dir(path, FALSE))
path = mallocstrcpy(path, operating_dir);
#endif
if (path != NULL)
dir = opendir(path);
/* If we can't open the path, get out. */
if (dir == NULL) {
free(path);
beep();
return NULL;
}
return do_browser(path, dir);
}
/* Set filelist to the list of files contained in the directory path,
* set filelist_len to the number of files in that list, set longest to
* the width in columns of the longest filename in that list (between 15
* and COLS), and set width to the number of files that we can display
* per line. longest needs to be at least 15 columns in order to
* display ".. (parent dir)", as Pico does. Assume path exists and is a
* directory. */
void browser_init(const char *path, DIR *dir)
{
const struct dirent *nextdir;
size_t i = 0, path_len = strlen(path);
int col = 0;
/* The maximum number of columns that the filenames will take
* up. */
int line = 0;
/* The maximum number of lines that the filenames will take
* up. */
int filesperline = 0;
/* The number of files that we can display per line. */
assert(path != NULL && path[strlen(path) - 1] == '/' && dir != NULL);
longest = 0;
/* Find the length of the longest filename in the current folder. */
while ((nextdir = readdir(dir)) != NULL) {
size_t name_len = strlenpt(nextdir->d_name);
if (name_len > longest)
longest = name_len;
i++;
}
/* Put 10 characters' worth of blank space between columns of filenames
* in the list whenever possible, as Pico does. */
longest += 10;
/* Make sure longest is between 15 and COLS. */
if (longest < 15)
longest = 15;
if (longest > COLS)
longest = COLS;
rewinddir(dir);
free_chararray(filelist, filelist_len);
filelist_len = i;
filelist = (char **)nmalloc(filelist_len * sizeof(char *));
i = 0;
while ((nextdir = readdir(dir)) != NULL && i < filelist_len) {
/* Don't show the "." entry. */
if (strcmp(nextdir->d_name, ".") == 0)
continue;
filelist[i] = charalloc(path_len + strlen(nextdir->d_name) + 1);
sprintf(filelist[i], "%s%s", path, nextdir->d_name);
i++;
}
/* Maybe the number of files in the directory changed between the
* first time we scanned and the second. i is the actual length of
* filelist, so record it. */
filelist_len = i;
closedir(dir);
/* Set width to zero, just before we initialize it. */
width = 0;
for (i = 0; i < filelist_len && line < editwinrows; i++) {
/* Calculate the number of columns one filename will take up. */
col += longest;
filesperline++;
/* Add some space between the columns. */
col += 2;
/* If the next entry isn't going to fit on the current line,
* move to the next line. */
if (col > COLS - longest) {
line++;
col = 0;
/* If width isn't initialized yet, and we've taken up more
* than one line, it means that width is equal to
* filesperline. */
if (width == 0)
width = filesperline;
}
}
/* If width isn't initialized yet, and we've taken up only one line,
* it means that width is equal to longest. */
if (width == 0)
width = longest;
}
/* Return the function that is bound to the given key, accepting certain
* plain characters too, for compatibility with Pico. */
functionptrtype parse_browser_input(int *kbinput)
{
if (!meta_key) {
switch (*kbinput) {
case ' ':
return do_page_down;
case '-':
return do_page_up;
case '?':
return do_help_void;
case 'E':
case 'e':
return do_exit;
case 'G':
case 'g':
return goto_dir_void;
case 'S':
case 's':
return do_enter;
case 'W':
case 'w':
return do_search;
}
}
return func_from_key(kbinput);
}
/* Set width to the number of files that we can display per line, if
* necessary, and display the list of files. */
void browser_refresh(void)
{
size_t i;
int line = 0, col = 0;
/* The current line and column while the list is getting displayed. */
char *info;
/* The additional information that we'll display about a file. */
titlebar(path_save);
blank_edit();
wmove(edit, 0, 0);
i = width * editwinrows * ((selected / width) / editwinrows);
for (; i < filelist_len && line < editwinrows; i++) {
struct stat st;
const char *thename = tail(filelist[i]);
/* The filename we display, minus the path. */
size_t namelen = strlenpt(thename);
/* The length of the filename in columns. */
size_t infolen;
/* The length of the file information in columns. */
int infomaxlen = 7;
/* The maximum length of the file information in
* columns: seven for "--", "(dir)", or the file size,
* and 12 for "(parent dir)". */
bool dots = (COLS >= 15 && namelen >= longest - infomaxlen);
/* Do we put an ellipsis before the filename? Don't set
* this to TRUE if we have fewer than 15 columns (i.e.
* one column for padding, plus seven columns for a
* filename other than ".."). */
char *disp = display_string(thename, dots ? namelen -
longest + infomaxlen + 4 : 0, longest, FALSE);
/* If we put an ellipsis before the filename, reserve
* one column for padding, plus seven columns for "--",
* "(dir)", or the file size, plus three columns for the
* ellipsis. */
/* Start highlighting the currently selected file or directory. */
if (i == selected)
wattron(edit, hilite_attribute);
blank_line(edit, line, col, longest);
/* If dots is TRUE, we will display something like "...ename". */
if (dots)
mvwaddstr(edit, line, col, "...");
mvwaddstr(edit, line, dots ? col + 3 : col, disp);
free(disp);
col += longest;
/* Show information about the file. We don't want to report
* file sizes for links, so we use lstat(). */
if (lstat(filelist[i], &st) == -1 || S_ISLNK(st.st_mode)) {
/* If the file doesn't exist (i.e. it's been deleted while
* the file browser is open), or it's a symlink that doesn't
* point to a directory, display "--". */
if (stat(filelist[i], &st) == -1 || !S_ISDIR(st.st_mode))
info = mallocstrcpy(NULL, "--");
/* If the file is a symlink that points to a directory,
* display it as a directory. */
else
/* TRANSLATORS: Try to keep this at most 7 characters. */
info = mallocstrcpy(NULL, _("(dir)"));
} else if (S_ISDIR(st.st_mode)) {
/* If the file is a directory, display it as such. */
if (strcmp(thename, "..") == 0) {
/* TRANSLATORS: Try to keep this at most 12 characters. */
info = mallocstrcpy(NULL, _("(parent dir)"));
infomaxlen = 12;
} else
info = mallocstrcpy(NULL, _("(dir)"));
} else {
off_t result = st.st_size;
char modifier;
info = charalloc(infomaxlen + 1);
if (st.st_size < (1 << 10))
modifier = ' '; /* bytes */
else if (st.st_size < (1 << 20)) {
result >>= 10;
modifier = 'K'; /* kilobytes */
} else if (st.st_size < (1 << 30)) {
result >>= 20;
modifier = 'M'; /* megabytes */
} else {
result >>= 30;
modifier = 'G'; /* gigabytes */
}
/* Show the size if less than a terabyte,
* otherwise show "(huge)". */
if (result < (1 << 10))
sprintf(info, "%4ju %cB", (intmax_t)result, modifier);
else
/* TRANSLATORS: Try to keep this at most 7 characters.
* If necessary, you can leave out the parentheses. */
info = mallocstrcpy(info, _("(huge)"));
}
/* Make sure info takes up no more than infomaxlen columns. */
infolen = strlenpt(info);
if (infolen > infomaxlen) {
null_at(&info, actual_x(info, infomaxlen));
infolen = infomaxlen;
}
mvwaddstr(edit, line, col - infolen, info);
/* Finish highlighting the currently selected file or directory. */
if (i == selected)
wattroff(edit, hilite_attribute);
free(info);
/* Add some space between the columns. */
col += 2;
/* If the next entry isn't going to fit on the current line,
* move to the next line. */
if (col > COLS - longest) {
line++;
col = 0;
}
wmove(edit, line, col);
}
wnoutrefresh(edit);
}
/* Look for needle. If we find it, set selected to its location.
* Note that needle must be an exact match for a file in the list. */
void browser_select_dirname(const char *needle)
{
size_t looking_at = 0;
for (; looking_at < filelist_len; looking_at++) {
if (strcmp(filelist[looking_at], needle) == 0) {
selected = looking_at;
break;
}
}
}
/* Set up the system variables for a filename search. Return -1 or -2 if
* the search should be canceled (due to Cancel or a blank search string),
* return 0 when we have a string, and return a positive value when some
* function was run. */
int filesearch_init(void)
{
int input;
char *buf;
if (last_search[0] != '\0') {
char *disp = display_string(last_search, 0, COLS / 3, FALSE);
buf = charalloc(strlen(disp) + 7);
/* We use (COLS / 3) here because we need to see more on the line. */
sprintf(buf, " [%s%s]", disp,
(strlenpt(last_search) > COLS / 3) ? "..." : "");
free(disp);
} else
buf = mallocstrcpy(NULL, "");
/* This is now one simple call. It just does a lot. */
input = do_prompt(FALSE,
#ifndef DISABLE_TABCOMP
TRUE,
#endif
MWHEREISFILE, NULL,
#ifndef DISABLE_HISTORIES
&search_history,
#endif
browser_refresh, "%s%s", _("Search"), buf);
/* Release buf now that we don't need it anymore. */
free(buf);
/* If only Enter was pressed but we have a previous string, it's okay. */
if (input == -2 && *last_search != '\0')
return 0;
/* Otherwise negative inputs are a bailout. */
if (input < 0)
statusbar(_("Cancelled"));
return input;
}
/* Look for the given needle in the list of files. */
void findnextfile(const char *needle)
{
size_t looking_at = selected;
/* The location in the file list of the filename we're looking at. */
const char *thename;
/* The plain filename, without the path. */
unsigned stash[sizeof(flags) / sizeof(flags[0])];
/* A storage place for the current flag settings. */
/* Save the settings of all flags. */
memcpy(stash, flags, sizeof(flags));
/* Search forward, case insensitive and without regexes. */
UNSET(BACKWARDS_SEARCH);
UNSET(CASE_SENSITIVE);
UNSET(USE_REGEXP);
/* Step through each filename in the list until a match is found or
* we've come back to the point where we started. */
while (TRUE) {
/* Move to the next filename in the list, or back to the first. */
if (looking_at < filelist_len - 1)
looking_at++;
else {
looking_at = 0;
statusbar(_("Search Wrapped"));
}
/* Get the bare filename, without the path. */
thename = tail(filelist[looking_at]);
/* If the needle matches, we're done. And if we're back at the file
* where we started, it is the only occurrence. */
if (strstrwrapper(thename, needle, thename)) {
if (looking_at == selected)
statusbar(_("This is the only occurrence"));
break;
}
/* If we're back at the beginning and didn't find any match... */
if (looking_at == selected) {
not_found_msg(needle);
break;
}
}
/* Restore the settings of all flags. */
memcpy(flags, stash, sizeof(flags));
/* Select the one we've found. */
selected = looking_at;
}
/* Search for a filename. */
void do_filesearch(void)
{
if (filesearch_init() != 0) {
/* Cancelled, or a blank search string, or done something. */
bottombars(MBROWSER);
return;
}
/* If answer is now "", copy last_search into answer. */
if (*answer == '\0')
answer = mallocstrcpy(answer, last_search);
else
last_search = mallocstrcpy(last_search, answer);
#ifndef DISABLE_HISTORIES
/* If answer is not "", add this search string to the search history
* list. */
if (answer[0] != '\0')
update_history(&search_history, answer);
#endif
findnextfile(answer);
bottombars(MBROWSER);
}
/* Search for the last given filename again without prompting. */
void do_fileresearch(void)
{
if (last_search[0] == '\0')
statusbar(_("No current search pattern"));
else
findnextfile(last_search);
}
/* Select the first file in the list. */
void do_first_file(void)
{
selected = 0;
}
/* Select the last file in the list. */
void do_last_file(void)
{
selected = filelist_len - 1;
}
/* Strip one directory from the end of path, and return the stripped
* path. The returned string is dynamically allocated, and should be
* freed. */
char *striponedir(const char *path)
{
char *retval, *tmp;
assert(path != NULL);
retval = mallocstrcpy(NULL, path);
tmp = strrchr(retval, '/');
if (tmp != NULL)
null_at(&retval, tmp - retval);
return retval;
}
#endif /* !DISABLE_BROWSER */
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