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sdn/sdn.cpp

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//
// sdn: simple directory navigator
//
// Copyright (c) 2017 - 2018, Přemysl Janouch <p@janouch.name>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// May be required for ncursesw and we generally want it all anyway
#define _XOPEN_SOURCE_EXTENDED
#include <string>
#include <vector>
#include <locale>
#include <iostream>
#include <algorithm>
#include <cwchar>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <map>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/acl.h>
#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <sys/inotify.h>
#include <sys/xattr.h>
#include <acl/libacl.h>
#include <ncurses.h>
// Unicode is complex enough already and we might make assumptions
#ifndef __STDC_ISO_10646__
#error Unicode required for wchar_t
#endif
// Trailing return types make C++ syntax suck considerably less
#define fun static auto
#ifndef A_ITALIC
#define A_ITALIC 0
#endif
using namespace std;
// For some reason handling of encoding in C and C++ is extremely annoying
// and C++17 ironically obsoletes C++11 additions that made it less painful
fun to_wide (const string &multi) -> wstring {
wstring wide; wchar_t w; mbstate_t mb {};
size_t n = 0, len = multi.length () + 1;
while (auto res = mbrtowc (&w, multi.c_str () + n, len - n, &mb)) {
if (res == size_t (-1) || res == size_t (-2))
return L"/invalid encoding/";
n += res;
wide += w;
}
return wide;
}
fun to_mb (const wstring &wide) -> string {
string mb; char buf[MB_LEN_MAX + 1]; mbstate_t mbs {};
for (size_t n = 0; n <= wide.length (); n++) {
auto res = wcrtomb (buf, wide.c_str ()[n], &mbs);
if (res == size_t (-1))
throw invalid_argument ("invalid encoding");
mb.append (buf, res);
}
// There's one extra NUL character added by wcrtomb()
mb.erase (mb.length () - 1);
return mb;
}
fun prefix_length (const wstring &in, const wstring &of) -> int {
int score = 0;
for (size_t i = 0; i < of.size () && in.size () >= i && in[i] == of[i]; i++)
score++;
return score;
}
fun split (const string &s, const string &sep, vector<string> &out) {
size_t mark = 0, p = s.find (sep);
for (; p != string::npos; p = s.find (sep, (mark = p + sep.length ())))
if (mark < p)
out.push_back (s.substr (mark, p - mark));
if (mark < s.length ())
out.push_back (s.substr (mark));
}
fun split (const string &s, const string &sep) -> vector<string> {
vector<string> result; split (s, sep, result); return result;
}
fun needs_shell_quoting (const string &v) -> bool {
// IEEE Std 1003.1 sh + the exclamation mark because of csh/bash
// history expansion, implicitly also the NUL character
for (auto c : v)
if (strchr ("|&;<>()$`\\\"' \t\n" "*?[#˜=%" "!", c))
return true;
return false;
}
fun shell_escape (const string &v) -> string {
if (!needs_shell_quoting (v))
return v;
string result;
for (auto c : v)
if (c == '\'')
result += "'\\''";
else
result += c;
return "'" + result + "'";
}
fun decode_type (mode_t m) -> wchar_t {
if (S_ISDIR (m)) return L'd'; if (S_ISBLK (m)) return L'b';
if (S_ISCHR (m)) return L'c'; if (S_ISLNK (m)) return L'l';
if (S_ISFIFO (m)) return L'p'; if (S_ISSOCK (m)) return L's';
if (S_ISREG (m)) return L'-';
return L'?';
}
/// Return the modes of a file in the usual stat/ls format
fun decode_mode (mode_t m) -> wstring {
return { decode_type (m),
L"r-"[!(m & S_IRUSR)],
L"w-"[!(m & S_IWUSR)],
((m & S_ISUID) ? L"sS" : L"x-")[!(m & S_IXUSR)],
L"r-"[!(m & S_IRGRP)],
L"w-"[!(m & S_IWGRP)],
((m & S_ISGID) ? L"sS" : L"x-")[!(m & S_IXGRP)],
L"r-"[!(m & S_IROTH)],
L"w-"[!(m & S_IWOTH)],
((m & S_ISVTX) ? L"tT" : L"x-")[!(m & S_IXOTH)],
};
}
template<class T> fun shift (vector<T> &v) -> T {
auto front = v.front (); v.erase (begin (v)); return front;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
fun xdg_config_home () -> string {
const char *user_dir = getenv ("XDG_CONFIG_HOME");
if (user_dir && user_dir[0] == '/')
return user_dir;
const char *home_dir = getenv ("HOME");
return string (home_dir ? home_dir : "") + "/.config";
}
// In C++17 we will get <optional> but until then there's unique_ptr
fun xdg_config_find (const string &suffix) -> unique_ptr<ifstream> {
vector<string> dirs {xdg_config_home ()};
const char *system_dirs = getenv ("XDG_CONFIG_DIRS");
split (system_dirs ? system_dirs : "/etc/xdg", ":", dirs);
for (const auto &dir : dirs) {
if (dir[0] != '/')
continue;
if (ifstream ifs {dir + suffix})
return make_unique<ifstream> (move (ifs));
}
return nullptr;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
using ncstring = basic_string<cchar_t>;
fun cchar (chtype attrs, wchar_t c) -> cchar_t {
cchar_t ch {};
setcchar (&ch, &c, attrs, PAIR_NUMBER (attrs), nullptr);
return ch;
}
fun decolor (cchar_t &ch) {
wchar_t c[CCHARW_MAX]; attr_t attrs; short pair;
getcchar (&ch, c, &attrs, &pair, nullptr);
setcchar (&ch, c, attrs &~ A_REVERSE, 0, nullptr);
}
fun apply_attrs (const wstring &w, attr_t attrs) -> ncstring {
ncstring res;
for (auto c : w)
res += cchar (attrs, c);
return res;
}
fun sanitize_char (chtype attrs, wchar_t c) -> ncstring {
if (c < 32)
return {cchar (attrs | A_REVERSE, L'^'),
cchar (attrs | A_REVERSE, c + 64)};
if (!iswprint (c))
return {cchar (attrs | A_REVERSE, L'?')};
return {cchar (attrs, c)};
}
fun sanitize (const ncstring &nc) -> ncstring {
ncstring out;
for (cchar_t c : nc)
for (size_t i = 0; i < CCHARW_MAX && c.chars[i]; i++)
out += sanitize_char (c.attr, c.chars[i]);
return out;
}
fun print (const ncstring &nc, int limit) -> int {
int total_width = 0;
for (cchar_t c : sanitize (nc)) {
int width = wcwidth (c.chars[0]);
if (total_width + width > limit)
break;
add_wch (&c);
total_width += width;
}
return total_width;
}
fun compute_width (const ncstring &nc) -> int {
int total = 0;
for (const auto &c : nc)
total += wcwidth (c.chars[0]);
return total;
}
// TODO: maybe we need formatting for the padding passed in?
fun align (const ncstring &nc, int target) -> ncstring {
auto current = compute_width (nc);
auto missing = abs (target) - current;
if (missing <= 0)
return nc;
return target < 0
? nc + apply_attrs (wstring (missing, L' '), 0)
: apply_attrs (wstring (missing, L' '), 0) + nc;
}
fun allocate_pair (short fg, short bg) -> short {
static short counter = 1; init_pair (counter, fg, bg); return counter++;
}
fun decode_attrs (const vector<string> &attrs) -> chtype {
chtype result = 0; int fg = -1, bg = -1, colors = 0;
for (const auto &s : attrs) {
char *end; auto color = strtol (s.c_str (), &end, 10);
if (!*end && color >= -1 && color < COLORS) {
if (++colors == 1) fg = color;
else if (colors == 2) bg = color;
}
else if (s == "bold") result |= A_BOLD;
else if (s == "dim") result |= A_DIM;
else if (s == "ul") result |= A_UNDERLINE;
else if (s == "blink") result |= A_BLINK;
else if (s == "reverse") result |= A_REVERSE;
else if (s == "italic") result |= A_ITALIC;
}
if (fg != -1 || bg != -1)
result |= COLOR_PAIR (allocate_pair (fg, bg));
return result;
}
// --- Application -------------------------------------------------------------
enum { ALT = 1 << 24, SYM = 1 << 25 }; // Outside the range of Unicode
#define KEY(name) (SYM | KEY_ ## name)
#define CTRL 31 &
struct entry {
string filename, target_path;
struct stat info = {}, target_info = {};
enum { MODES, USER, GROUP, SIZE, MTIME, FILENAME, COLUMNS };
ncstring cols[COLUMNS];
auto operator< (const entry &other) -> bool {
auto a = S_ISDIR (info.st_mode);
auto b = S_ISDIR (other.info.st_mode);
return (a && !b) || (a == b && filename < other.filename);
}
};
#define ACTIONS(XX) XX(NONE) XX(CHOOSE) XX(CHOOSE_FULL) XX(QUIT) \
XX(UP) XX(DOWN) XX(TOP) XX(BOTTOM) XX(PAGE_PREVIOUS) XX(PAGE_NEXT) \
XX(SCROLL_UP) XX(SCROLL_DOWN) XX(GO_START) XX(GO_HOME) \
XX(SEARCH) XX(RENAME) XX(RENAME_PREFILL) \
XX(TOGGLE_FULL) XX(REDRAW) XX(RELOAD) \
XX(INPUT_ABORT) XX(INPUT_CONFIRM) XX(INPUT_B_DELETE)
#define XX(name) ACTION_ ## name,
enum action { ACTIONS(XX) ACTION_COUNT };
#undef XX
#define XX(name) #name,
static const char *g_action_names[] = {ACTIONS(XX)};
#undef XX
static map<wint_t, action> g_normal_actions = {
{ALT | '\r', ACTION_CHOOSE_FULL}, {ALT | KEY (ENTER), ACTION_CHOOSE_FULL},
{'\r', ACTION_CHOOSE}, {KEY (ENTER), ACTION_CHOOSE},
// M-o ought to be the same shortcut the navigator is launched with
{ALT | 'o', ACTION_QUIT}, {'q', ACTION_QUIT},
{'k', ACTION_UP}, {CTRL 'p', ACTION_UP}, {KEY (UP), ACTION_UP},
{'j', ACTION_DOWN}, {CTRL 'n', ACTION_DOWN}, {KEY (DOWN), ACTION_DOWN},
{'g', ACTION_TOP}, {ALT | '<', ACTION_TOP}, {KEY (HOME), ACTION_TOP},
{'G', ACTION_BOTTOM}, {ALT | '>', ACTION_BOTTOM}, {KEY(END), ACTION_BOTTOM},
{KEY (PPAGE), ACTION_PAGE_PREVIOUS}, {KEY (NPAGE), ACTION_PAGE_NEXT},
{CTRL 'y', ACTION_SCROLL_UP}, {CTRL 'e', ACTION_SCROLL_DOWN},
{'&', ACTION_GO_START}, {'~', ACTION_GO_HOME},
{'/', ACTION_SEARCH}, {'s', ACTION_SEARCH},
{ALT | 'e', ACTION_RENAME_PREFILL}, {'e', ACTION_RENAME},
{'t', ACTION_TOGGLE_FULL}, {ALT | 't', ACTION_TOGGLE_FULL},
{CTRL 'L', ACTION_REDRAW}, {'r', ACTION_RELOAD},
};
static map<wint_t, action> g_input_actions = {
{27, ACTION_INPUT_ABORT}, {CTRL 'g', ACTION_INPUT_ABORT},
{L'\r', ACTION_INPUT_CONFIRM}, {KEY (ENTER), ACTION_INPUT_CONFIRM},
{KEY (BACKSPACE), ACTION_INPUT_B_DELETE},
};
static const map<string, map<wint_t, action>*> g_binding_contexts = {
{"normal", &g_normal_actions}, {"input", &g_input_actions},
};
#define LS(XX) XX(NORMAL, "no") XX(FILE, "fi") XX(RESET, "rs") \
XX(DIRECTORY, "di") XX(SYMLINK, "ln") XX(MULTIHARDLINK, "mh") \
XX(FIFO, "pi") XX(SOCKET, "so") XX(DOOR, "do") XX(BLOCK, "bd") \
XX(CHARACTER, "cd") XX(ORPHAN, "or") XX(MISSING, "mi") XX(SETUID, "su") \
XX(SETGID, "sg") XX(CAPABILITY, "ca") XX(STICKY_OTHER_WRITABLE, "tw") \
XX(OTHER_WRITABLE, "ow") XX(STICKY, "st") XX(EXECUTABLE, "ex")
#define XX(id, name) LS_ ## id,
enum { LS(XX) LS_COUNT };
#undef XX
#define XX(id, name) name,
static const char *g_ls_colors[] = {LS(XX)};
#undef XX
struct stringcaseless {
bool operator () (const string &a, const string &b) const {
const auto &c = locale::classic();
return lexicographical_compare (begin (a), end (a), begin (b), end (b),
[&](char m, char n) { return tolower (m, c) < tolower (n, c); });
}
};
static struct {
string cwd; ///< Current working directory
string start_dir; ///< Starting directory
vector<entry> entries; ///< Current directory entries
int offset, cursor; ///< Scroll offset and cursor position
bool full_view; ///< Show extended information
int max_widths[entry::COLUMNS]; ///< Column widths
string chosen; ///< Chosen item for the command line
bool chosen_full; ///< Use the full path
int inotify_fd, inotify_wd = -1; ///< File watch
bool out_of_date; ///< Entries may be out of date
const wchar_t *editor; ///< Prompt string for editing
wstring editor_line; ///< Current user input
void (*editor_on_change) (); ///< Callback on editor change
void (*editor_on_confirm) (); ///< Callback on editor confirmation
enum { AT_CURSOR, AT_BAR, AT_CWD, AT_INPUT, AT_COUNT };
chtype attrs[AT_COUNT] = {A_REVERSE, 0, A_BOLD, 0};
const char *attr_names[AT_COUNT] = {"cursor", "bar", "cwd", "input"};
map<int, chtype> ls_colors; ///< LS_COLORS decoded
map<string, chtype> ls_exts; ///< LS_COLORS file extensions
bool ls_symlink_as_target; ///< ln=target in dircolors
map<string, wint_t, stringcaseless> key_names;
// Refreshed by reload():
map<uid_t, string> unames; ///< User names by UID
map<gid_t, string> gnames; ///< Group names by GID
struct tm now; ///< Current local time for display
} g;
// The coloring logic has been more or less exactly copied from GNU ls,
// simplified and rewritten to reflect local implementation specifics
fun ls_is_colored (int type) -> bool {
auto i = g.ls_colors.find (type);
return i != g.ls_colors.end () && i->second != 0;
}
fun ls_format (const entry &e, bool for_target) -> chtype {
int type = LS_ORPHAN;
auto set = [&](int t) { if (ls_is_colored (t)) type = t; };
const auto &name = for_target
? e.target_path : e.filename;
const auto &info =
(for_target || (g.ls_symlink_as_target && e.target_info.st_mode))
? e.target_info : e.info;
if (for_target && info.st_mode == 0) {
// This differs from GNU ls: we use ORPHAN when MISSING is not set,
// but GNU ls colors by dirent::d_type
set (LS_MISSING);
} else if (S_ISREG (info.st_mode)) {
type = LS_FILE;
if (info.st_nlink > 1)
set (LS_MULTIHARDLINK);
if ((info.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
set (LS_EXECUTABLE);
if (lgetxattr (name.c_str (), "security.capability", NULL, 0) >= 0)
set (LS_CAPABILITY);
if ((info.st_mode & S_ISGID))
set (LS_SETGID);
if ((info.st_mode & S_ISUID))
set (LS_SETUID);
} else if (S_ISDIR (info.st_mode)) {
type = LS_DIRECTORY;
if ((info.st_mode & S_ISVTX))
set (LS_STICKY);
if ((info.st_mode & S_IWOTH))
set (LS_OTHER_WRITABLE);
if ((info.st_mode & S_ISVTX) && (info.st_mode & S_IWOTH))
set (LS_STICKY_OTHER_WRITABLE);
} else if (S_ISLNK (info.st_mode)) {
type = LS_SYMLINK;
if (!e.target_info.st_mode
&& (ls_is_colored (LS_ORPHAN) || g.ls_symlink_as_target))
type = LS_ORPHAN;
} else if (S_ISFIFO (info.st_mode)) {
type = LS_FIFO;
} else if (S_ISSOCK (info.st_mode)) {
type = LS_SOCKET;
} else if (S_ISBLK (info.st_mode)) {
type = LS_BLOCK;
} else if (S_ISCHR (info.st_mode)) {
type = LS_CHARACTER;
}
chtype format = 0;
const auto x = g.ls_colors.find (type);
if (x != g.ls_colors.end ())
format = x->second;
auto dot = name.find_last_of ('.');
if (dot != string::npos && type == LS_FILE) {
const auto x = g.ls_exts.find (name.substr (++dot));
if (x != g.ls_exts.end ())
format = x->second;
}
return format;
}
fun make_entry (const struct dirent *f) -> entry {
entry e;
e.filename = f->d_name;
e.info.st_mode = DTTOIF (f->d_type);
auto& info = e.info;
// TODO: benchmark just readdir() vs. lstat(), also on dead mounts;
// it might make sense to stat asynchronously in threads
// http://lkml.iu.edu/hypermail//linux/kernel/0804.3/1616.html
if (lstat (f->d_name, &info)) {
e.cols[entry::MODES] = apply_attrs ({ decode_type (info.st_mode),
L'?', L'?', L'?', L'?', L'?', L'?', L'?', L'?', L'?' }, 0);
e.cols[entry::USER] = e.cols[entry::GROUP] =
e.cols[entry::SIZE] = e.cols[entry::MTIME] = apply_attrs (L"?", 0);
e.cols[entry::FILENAME] =
apply_attrs (to_wide (e.filename), ls_format (e, false));
return e;
}
if (S_ISLNK (info.st_mode)) {
char buf[PATH_MAX] = {};
auto len = readlink (f->d_name, buf, sizeof buf);
if (len < 0 || size_t (len) >= sizeof buf) {
e.target_path = "?";
} else {
e.target_path = buf;
// If a symlink links to another symlink, we follow all the way
(void) stat (buf, &e.target_info);
}
}
auto mode = decode_mode (info.st_mode);
// This is a Linux-only extension
if (acl_extended_file_nofollow (f->d_name) > 0)
mode += L"+";
e.cols[entry::MODES] = apply_attrs (mode, 0);
auto usr = g.unames.find (info.st_uid);
e.cols[entry::USER] = (usr != g.unames.end ())
? apply_attrs (to_wide (usr->second), 0)
: apply_attrs (to_wstring (info.st_uid), 0);
auto grp = g.gnames.find (info.st_gid);
e.cols[entry::GROUP] = (grp != g.unames.end ())
? apply_attrs (to_wide (grp->second), 0)
: apply_attrs (to_wstring (info.st_gid), 0);
auto size = to_wstring (info.st_size);
if (info.st_size >> 40) size = to_wstring (info.st_size >> 40) + L"T";
else if (info.st_size >> 30) size = to_wstring (info.st_size >> 30) + L"G";
else if (info.st_size >> 20) size = to_wstring (info.st_size >> 20) + L"M";
else if (info.st_size >> 10) size = to_wstring (info.st_size >> 10) + L"K";
e.cols[entry::SIZE] = apply_attrs (size, 0);
char buf[32] = "";
auto tm = localtime (&info.st_mtime);
strftime (buf, sizeof buf,
(tm->tm_year == g.now.tm_year) ? "%b %e %H:%M" : "%b %e %Y", tm);
e.cols[entry::MTIME] = apply_attrs (to_wide (buf), 0);
auto &fn = e.cols[entry::FILENAME] =
apply_attrs (to_wide (e.filename), ls_format (e, false));
if (!e.target_path.empty ()) {
fn.append (apply_attrs (to_wide (" -> "), 0));
fn.append (apply_attrs (to_wide (e.target_path), ls_format (e, true)));
}
return e;
}
fun inline visible_lines () -> int { return max (0, LINES - 2); }
fun update () {
int start_column = g.full_view ? 0 : entry::FILENAME;
static int alignment[entry::COLUMNS] = { -1, -1, -1, 1, 1, -1 };
erase ();
int available = visible_lines ();
int used = min (available, int (g.entries.size ()) - g.offset);
for (int i = 0; i < used; i++) {
auto index = g.offset + i;
bool selected = index == g.cursor;
attrset (selected ? g.attrs[g.AT_CURSOR] : 0);
move (available - used + i, 0);
auto used = 0;
for (int col = start_column; col < entry::COLUMNS; col++) {
const auto &field = g.entries[index].cols[col];
auto aligned = align (field, alignment[col] * g.max_widths[col]);
if (selected)
for_each (begin (aligned), end (aligned), decolor);
used += print (aligned + apply_attrs (L" ", 0), COLS - used);
}
hline (' ', COLS - used);
}
auto bar = apply_attrs (to_wide (g.cwd), g.attrs[g.AT_CWD]);
if (g.out_of_date)
bar += apply_attrs (L" [+]", 0);
move (LINES - 2, 0);
attrset (g.attrs[g.AT_BAR]);
hline (' ', COLS - print (bar, COLS));
attrset (g.attrs[g.AT_INPUT]);
if (g.editor) {
move (LINES - 1, 0);
auto p = apply_attrs (wstring (g.editor) + L": ", 0);
move (LINES - 1, print (p + apply_attrs (g.editor_line, 0), COLS - 1));
curs_set (1);
} else
curs_set (0);
refresh ();
}
fun reload () {
g.unames.clear();
while (auto *ent = getpwent ()) g.unames.emplace(ent->pw_uid, ent->pw_name);
endpwent();
g.gnames.clear();
while (auto *ent = getgrent ()) g.gnames.emplace(ent->gr_gid, ent->gr_name);
endgrent();
auto now = time (NULL); g.now = *localtime (&now);
char buf[4096]; g.cwd = getcwd (buf, sizeof buf);
auto dir = opendir (".");
g.entries.clear ();
while (auto f = readdir (dir)) {
// Two dots are for navigation but this ain't as useful
if (f->d_name != string ("."))
g.entries.push_back (make_entry (f));
}
closedir (dir);
sort (begin (g.entries), end (g.entries));
g.out_of_date = false;
for (int col = 0; col < entry::COLUMNS; col++) {
auto &longest = g.max_widths[col] = 0;
for (const auto &entry : g.entries)
longest = max (longest, compute_width (entry.cols[col]));
}
g.cursor = min (g.cursor, int (g.entries.size ()) - 1);
g.offset = min (g.offset, int (g.entries.size ()) - 1);
if (g.inotify_wd != -1)
inotify_rm_watch (g.inotify_fd, g.inotify_wd);
// We don't show atime, so access and open are merely spam
g.inotify_wd = inotify_add_watch (g.inotify_fd, buf,
(IN_ALL_EVENTS | IN_ONLYDIR | IN_EXCL_UNLINK) & ~(IN_ACCESS | IN_OPEN));
}
fun search (const wstring &needle) {
int best = g.cursor, best_n = 0;
for (int i = 0; i < int (g.entries.size ()); i++) {
auto o = (i + g.cursor) % g.entries.size ();
int n = prefix_length (to_wide (g.entries[o].filename), needle);
if (n > best_n) {
best = o;
best_n = n;
}
}
g.cursor = best;
}
fun change_dir (const string &path) {
if (chdir (path.c_str ())) {
beep ();
} else {
// TODO: remember cursor going down, then restore going up
g.cursor = 0;
reload ();
}
}
fun choose (const entry &entry) -> bool {
// Dive into directories and accessible symlinks to them
if (!S_ISDIR (entry.info.st_mode)
&& !S_ISDIR (entry.target_info.st_mode)) {
g.chosen = entry.filename;
return false;
}
change_dir (entry.filename);
return true;
}
fun handle_editor (wint_t c) {
auto i = g_input_actions.find (c);
switch (i == g_input_actions.end () ? ACTION_NONE : i->second) {
case ACTION_INPUT_CONFIRM:
if (g.editor_on_confirm)
g.editor_on_confirm ();
// Fall-through
case ACTION_INPUT_ABORT:
g.editor_line.clear ();
g.editor = 0;
g.editor_on_change = nullptr;
g.editor_on_confirm = nullptr;
break;
case ACTION_INPUT_B_DELETE:
if (!g.editor_line.empty ())
g.editor_line.erase (g.editor_line.length () - 1);
break;
default:
if (c & (ALT | SYM)) {
beep ();
} else {
g.editor_line += c;
if (g.editor_on_change)
g.editor_on_change ();
}
}
}
fun handle (wint_t c) -> bool {
// If an editor is active, let it handle the key instead and eat it
if (g.editor) {
handle_editor (c);
c = WEOF;
}
const auto &current = g.entries[g.cursor];
auto i = g_normal_actions.find (c);
switch (i == g_normal_actions.end () ? ACTION_NONE : i->second) {
case ACTION_CHOOSE_FULL:
g.chosen_full = true;
g.chosen = current.filename;
return false;
case ACTION_CHOOSE:
if (choose (current))
break;
return false;
case ACTION_QUIT:
return false;
case ACTION_UP:
g.cursor--;
break;
case ACTION_DOWN:
g.cursor++;
break;
case ACTION_TOP:
g.cursor = 0;
break;
case ACTION_BOTTOM:
g.cursor = int (g.entries.size ()) - 1;
break;
case ACTION_PAGE_PREVIOUS:
g.cursor -= LINES;
break;
case ACTION_PAGE_NEXT:
g.cursor += LINES;
break;
case ACTION_SCROLL_DOWN:
g.offset++;
break;
case ACTION_SCROLL_UP:
g.offset--;
break;
case ACTION_GO_START:
change_dir (g.start_dir);
break;
case ACTION_GO_HOME:
if (const auto *home = getenv ("HOME"))
change_dir (home);
else if (const auto *pw = getpwuid (getuid ()))
change_dir (pw->pw_dir);
break;
case ACTION_SEARCH:
g.editor = L"search";
g.editor_on_change = [] {
search (g.editor_line);
};
break;
case ACTION_RENAME_PREFILL:
g.editor_line = to_wide (current.filename);
// Fall-through
case ACTION_RENAME:
g.editor = L"rename";
g.editor_on_confirm = [] {
auto mb = to_mb (g.editor_line);
rename (g.entries[g.cursor].filename.c_str (), mb.c_str ());
reload ();
};
break;
case ACTION_TOGGLE_FULL:
g.full_view = !g.full_view;
break;
case ACTION_REDRAW:
clear ();
break;
case ACTION_RELOAD:
reload ();
break;
default:
if (c != KEY (RESIZE) && c != WEOF)
beep ();
}
g.cursor = max (g.cursor, 0);
g.cursor = min (g.cursor, int (g.entries.size ()) - 1);
// Decrease the offset when more items can suddenly fit
int pushable = visible_lines () - (int (g.entries.size ()) - g.offset);
g.offset -= max (pushable, 0);
// Make sure cursor is visible
g.offset = max (g.offset, 0);
g.offset = min (g.offset, int (g.entries.size ()) - 1);
if (g.offset > g.cursor)
g.offset = g.cursor;
if (g.cursor - g.offset >= visible_lines ())
g.offset = g.cursor - visible_lines () + 1;
update ();
return true;
}
fun inotify_check () {
// Only provide simple indication that contents might have changed
char buf[4096]; ssize_t len;
bool changed = false;
while ((len = read (g.inotify_fd, buf, sizeof buf)) > 0) {
const inotify_event *e;
for (char *ptr = buf; ptr < buf + len; ptr += sizeof *e + e->len) {
e = (const inotify_event *) buf;
if (e->wd == g.inotify_wd)
changed = g.out_of_date = true;
}
}
if (changed)
update ();
}
fun decode_ansi_sgr (const vector<string> &v) -> chtype {
vector<int> args;
for (const auto &arg : v) {
char *end; unsigned long ul = strtoul (arg.c_str (), &end, 10);
if (*end != '\0' || ul > 255)
return 0;
args.push_back (ul);
}
chtype result = 0; int fg = -1, bg = -1;
for (size_t i = 0; i < args.size (); i++) {
auto arg = args[i];
if (arg == 0) {
result = 0; fg = -1; bg = -1;
} else if (arg == 1) {
result |= A_BOLD;
} else if (arg == 4) {
result |= A_UNDERLINE;
} else if (arg == 5) {
result |= A_BLINK;
} else if (arg == 7) {
result |= A_REVERSE;
} else if (arg >= 30 && arg <= 37) {
fg = arg - 30;
} else if (arg >= 40 && arg <= 47) {
bg = arg - 40;
// Anything other than indexed colours will be rejected completely
} else if (arg == 38 && (i += 2) < args.size ()) {
if (args[i - 1] != 5 || (fg = args[i]) >= COLORS)
return 0;
} else if (arg == 48 && (i += 2) < args.size ()) {
if (args[i - 1] != 5 || (bg = args[i]) >= COLORS)
return 0;
}
}
if (fg != -1 || bg != -1)
result |= COLOR_PAIR (allocate_pair (fg, bg));
return result;
}
fun load_ls_colors (vector<string> colors) {
map<string, chtype> attrs;
for (const auto &pair : colors) {
auto equal = pair.find ('=');
if (equal == string::npos)
continue;
auto key = pair.substr (0, equal), value = pair.substr (equal + 1);
if (key != g_ls_colors[LS_SYMLINK]
|| !(g.ls_symlink_as_target = value == "target"))
attrs[key] = decode_ansi_sgr (split (value, ";"));
}
for (int i = 0; i < LS_COUNT; i++) {
auto m = attrs.find (g_ls_colors[i]);
if (m != attrs.end ())
g.ls_colors[i] = m->second;
}
for (const auto &pair : attrs) {
if (pair.first.substr (0, 2) == "*.")
g.ls_exts[pair.first.substr (2)] = pair.second;
}
}
fun load_colors () {
// Bail out on dumb terminals, there's not much one can do about them
if (!has_colors () || start_color () == ERR || use_default_colors () == ERR)
return;
if (const char *colors = getenv ("LS_COLORS"))
load_ls_colors (split (colors, ":"));
auto config = xdg_config_find ("/" PROJECT_NAME "/look");
if (!config)
return;
string line;
while (getline (*config, line)) {
auto tokens = split (line, " ");
if (tokens.empty () || line.front () == '#')
continue;
auto name = shift (tokens);
for (int i = 0; i < g.AT_COUNT; i++)
if (name == g.attr_names[i])
g.attrs[i] = decode_attrs (tokens);
}
}
fun read_key (wint_t &c) -> bool {
int res = get_wch (&c);
if (res == ERR)
return false;
wint_t metafied{};
if (c == 27 && (res = get_wch (&metafied)) != ERR)
c = ALT | metafied;
if (res == KEY_CODE_YES)
c |= SYM;
return true;
}
fun parse_key (const string &key_name) -> wint_t {
wint_t c{};
auto p = key_name.c_str ();
if (!strncmp (p, "M-", 2)) {
c |= ALT;
p += 2;
}
if (!strncmp (p, "C-", 2)) {
p += 2;
if (*p < 32) {
cerr << "bindings: invalid combination: " << key_name << endl;
return WEOF;
}
c |= CTRL *p;
p += 1;
} else if (g.key_names.count (p)) {
return c | g.key_names.at (p);
} else {
wchar_t w; mbstate_t mb {};
auto len = strlen (p) + 1, res = mbrtowc (&w, p, len, &mb);
if (res == 0) {
cerr << "bindings: missing key name: " << key_name << endl;
return WEOF;
}
if (res == size_t (-1) || res == size_t (-2)) {
cerr << "bindings: invalid encoding: " << key_name << endl;
return WEOF;
}
c |= w;
p += res;
}
if (*p) {
cerr << "key name has unparsable trailing part: " << key_name << endl;
return WEOF;
}
return c;
}
fun load_bindings () {
g.key_names["space"] = ' ';
for (int kc = KEY_MIN; kc < KEY_MAX; kc++) {
const char *name = keyname (kc);
if (!name)
continue;
if (!strncmp (name, "KEY_", 4))
name += 4;
string filtered;
for (; *name; name++) {
if (*name != '(' && *name != ')')
filtered += *name;
}
g.key_names[filtered] = kc;
}
auto config = xdg_config_find ("/" PROJECT_NAME "/bindings");
if (!config)
return;
// Stringization in the preprocessor is a bit limited, we want lisp-case
map<string, action> actions;
int a;
for (auto p : g_action_names) {
string name;
for (; *p; p++)
name += *p == '_' ? '-' : *p + 'a' - 'A';
actions[name] = action (a++);
}
string line;
while (getline (*config, line)) {
auto tokens = split (line, " ");
if (tokens.empty () || line.front () == '#')
continue;
if (tokens.size () < 3) {
cerr << "bindings: expected: context binding action";
continue;
}
auto context = tokens[0], key_name = tokens[1], action = tokens[2];
auto m = g_binding_contexts.find (context);
if (m == g_binding_contexts.end ()) {
cerr << "bindings: invalid context: " << context << endl;
continue;
}
wint_t c = parse_key (key_name);
if (c == WEOF)
continue;
auto i = actions.find (action);
if (i == actions.end ()) {
cerr << "bindings: invalid action: " << action << endl;
continue;
}
(*m->second)[c] = i->second;
}
}
int main (int argc, char *argv[]) {
(void) argc;
(void) argv;
// That bitch zle closes stdin before exec without redirection
(void) close (STDIN_FILENO);
if (open ("/dev/tty", O_RDWR)) {
cerr << "cannot open tty" << endl;
return 1;
}
// Save the original stdout and force ncurses to use the terminal directly
auto output_fd = dup (STDOUT_FILENO);
dup2 (STDIN_FILENO, STDOUT_FILENO);
if ((g.inotify_fd = inotify_init1 (IN_NONBLOCK)) < 0) {
cerr << "cannot initialize inotify" << endl;
return 1;
}
locale::global (locale (""));
load_bindings ();
if (!initscr () || cbreak () == ERR || noecho () == ERR || nonl () == ERR) {
cerr << "cannot initialize screen" << endl;
return 1;
}
load_colors ();
reload ();
g.start_dir = g.cwd;
update ();
// Invoking keypad() earlier would make ncurses flush its output buffer,
// which would worsen start-up flickering
if (halfdelay (1) == ERR || keypad (stdscr, TRUE) == ERR) {
endwin ();
cerr << "cannot configure input" << endl;
return 1;
}
wint_t c;
while (!read_key (c) || handle (c))
inotify_check ();
endwin ();
// Presumably it is going to end up as an argument, so quote it
if (!g.chosen.empty ())
g.chosen = shell_escape (g.chosen);
// We can't portably create a standard stream from an FD, so modify the FD
dup2 (output_fd, STDOUT_FILENO);
if (g.chosen_full) {
auto full_path = g.cwd + "/" + g.chosen;
cout << "local insert=" << shell_escape (full_path) << endl;
return 0;
}
if (g.cwd != g.start_dir)
cout << "local cd=" << shell_escape (g.cwd) << endl;
if (!g.chosen.empty ())
cout << "local insert=" << shell_escape (g.chosen) << endl;
return 0;
}
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