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sdn
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Load users, groups and current time once per refresh 

Avoids plenty of costly syscalls per loaded entry.
This commit is contained in:
Přemysl Eric Janouch 2018-10-24 08:47:02 +02:00
parent 1b74b1976a
commit 45f79abf9c
Signed by: p
GPG Key ID: A0420B94F92B9493
1 changed files with 24 additions and 12 deletions
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36
sdn.cpp
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@ -319,6 +319,12 @@ static struct {
map<int, chtype> ls_colors; ///< LS_COLORS decoded
map<string, chtype> ls_exts; ///< LS_COLORS file extensions
// 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;
fun ls_format (const string &filename, const struct stat &info) -> chtype {
@ -384,15 +390,15 @@ fun make_row (const string &filename, const struct stat &info) -> row {
mode += L"+";
r.cols[row::MODES] = apply_attrs (mode, 0);
auto user = to_wstring (info.st_uid);
if (auto u = getpwuid (info.st_uid))
user = to_wide (u->pw_name);
r.cols[row::USER] = apply_attrs (user, 0);
auto usr = g.unames.find (info.st_uid);
r.cols[row::USER] = (usr != g.unames.end ())
? apply_attrs (to_wide (usr->second), 0)
: apply_attrs (to_wstring (info.st_uid), 0);
auto group = to_wstring (info.st_gid);
if (auto g = getgrgid (info.st_gid))
group = to_wide (g->gr_name);
r.cols[row::GROUP] = apply_attrs (group, 0);
auto grp = g.gnames.find (info.st_gid);
r.cols[row::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";
@ -401,13 +407,10 @@ fun make_row (const string &filename, const struct stat &info) -> row {
else if (info.st_size >> 10) size = to_wstring (info.st_size >> 10) + L"K";
r.cols[row::SIZE] = apply_attrs (size, 0);
auto now = time (NULL);
auto now_year = localtime (&now)->tm_year;
char buf[32] = "";
auto tm = localtime (&info.st_mtime);
strftime (buf, sizeof buf,
(tm->tm_year == now_year) ? "%b %e %H:%M" : "%b %e %Y", tm);
(tm->tm_year == g.now.tm_year) ? "%b %e %H:%M" : "%b %e %Y", tm);
r.cols[row::MTIME] = apply_attrs (to_wide (buf), 0);
// TODO: show symlink target: check st_mode/DT_*, readlink
@ -463,6 +466,15 @@ fun update () {
}
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 (".");