Files
ncmpcpp/src/helpers.h
2012-09-04 18:50:33 +02:00

404 lines
10 KiB
C++

/***************************************************************************
* Copyright (C) 2008-2012 by Andrzej Rybczak *
* electricityispower@gmail.com *
* *
* 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 2 of the License, 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. *
***************************************************************************/
#ifndef _HELPERS_H
#define _HELPERS_H
#include "interfaces.h"
#include "mpdpp.h"
#include "screen.h"
#include "settings.h"
#include "status.h"
inline HasSongs *hasSongs(BasicScreen *screen)
{
return dynamic_cast<HasSongs *>(screen);
}
inline std::shared_ptr<ProxySongList> proxySongList(BasicScreen *screen)
{
auto ptr = nullProxySongList();
auto hs = hasSongs(screen);
if (hs)
ptr = hs->getProxySongList();
return ptr;
}
inline MPD::Song *currentSong(BasicScreen *screen)
{
MPD::Song *ptr = 0;
auto pl = proxySongList(screen);
if (pl)
ptr = pl->currentSong();
return ptr;
}
template <typename Iterator> bool hasSelected(Iterator first, Iterator last)
{
for (; first != last; ++first)
if (first->isSelected())
return true;
return false;
}
template <typename Iterator> std::vector<Iterator> getSelected(Iterator first, Iterator last)
{
std::vector<Iterator> result;
for (; first != last; ++first)
if (first->isSelected())
result.push_back(first);
return result;
}
template <typename T> void selectCurrentIfNoneSelected(NC::Menu<T> &m)
{
if (!hasSelected(m.begin(), m.end()))
m.current().setSelected(true);
}
template <typename Iterator>
std::vector<Iterator> getSelectedOrCurrent(Iterator first, Iterator last, Iterator current)
{
std::vector<Iterator> result = getSelected(first, last);
if (result.empty())
result.push_back(current);
return result;
}
template <typename T, typename F> void withUnfilteredMenu(NC::Menu<T> &m, F action)
{
bool is_filtered = m.isFiltered();
m.showAll();
action();
if (is_filtered)
m.showFiltered();
}
template <typename T, typename F>
void withUnfilteredMenuReapplyFilter(NC::Menu<T> &m, F action)
{
m.showAll();
action();
if (m.getFilter())
{
m.applyCurrentFilter(m.begin(), m.end());
if (m.empty())
{
m.clearFilter();
m.clearFilterResults();
}
}
}
template <typename T, typename F>
void moveSelectedItemsUp(NC::Menu<T> &m, F swap_fun)
{
if (m.choice() > 0)
selectCurrentIfNoneSelected(m);
auto list = getSelected(m.begin(), m.end());
auto begin = m.begin();
if (!list.empty() && list.front() != m.begin())
{
Mpd.StartCommandsList();
for (auto it = list.begin(); it != list.end(); ++it)
swap_fun(Mpd, *it - begin, *it - begin - 1);
if (Mpd.CommitCommandsList())
{
if (list.size() > 1)
{
for (auto it = list.begin(); it != list.end(); ++it)
{
(*it)->setSelected(false);
(*it-1)->setSelected(true);
}
m.highlight(list[(list.size())/2] - begin - 1);
}
else
{
// if we move only one item, do not select it. however, if single item
// was selected prior to move, it'll deselect it. oh well.
list[0]->setSelected(false);
m.scroll(NC::wUp);
}
}
}
}
template <typename T, typename F>
void moveSelectedItemsDown(NC::Menu<T> &m, F swap_fun)
{
if (m.choice() < m.size()-1)
selectCurrentIfNoneSelected(m);
auto list = getSelected(m.rbegin(), m.rend());
auto begin = m.begin() + 1; // reverse iterators add 1, so we need to cancel it
if (!list.empty() && list.front() != m.rbegin())
{
Mpd.StartCommandsList();
for (auto it = list.begin(); it != list.end(); ++it)
swap_fun(Mpd, it->base() - begin, it->base() - begin + 1);
if (Mpd.CommitCommandsList())
{
if (list.size() > 1)
{
for (auto it = list.begin(); it != list.end(); ++it)
{
(*it)->setSelected(false);
(*it-1)->setSelected(true);
}
m.highlight(list[(list.size())/2].base() - begin + 1);
}
else
{
// if we move only one item, do not select it. however, if single item
// was selected prior to move, it'll deselect it. oh well.
list[0]->setSelected(false);
m.scroll(NC::wDown);
}
}
}
}
template <typename T, typename F>
void moveSelectedItemsTo(NC::Menu<T> &m, F move_fun)
{
if (m.empty())
return;
auto cur_ptr = &m.current().value();
withUnfilteredMenu(m, [&]() {
// this is kinda shitty, but there is no other way to know
// what position current item has in unfiltered menu.
ptrdiff_t pos = 0;
for (auto it = m.begin(); it != m.end(); ++it, ++pos)
if (&it->value() == cur_ptr)
break;
auto begin = m.begin();
auto list = getSelected(m.begin(), m.end());
// we move only truly selected items
if (list.empty())
return;
// we can't move to the middle of selected items
//(this also handles case when list.size() == 1)
if (pos >= (list.front() - begin) && pos <= (list.back() - begin))
return;
int diff = pos - (list.front() - begin);
Mpd.StartCommandsList();
if (diff > 0) // move down
{
pos -= list.size();
size_t i = list.size()-1;
for (auto it = list.rbegin(); it != list.rend(); ++it, --i)
move_fun(Mpd, *it - begin, pos+i);
if (Mpd.CommitCommandsList())
{
i = list.size()-1;
for (auto it = list.rbegin(); it != list.rend(); ++it, --i)
{
(*it)->setSelected(false);
m[pos+i].setSelected(true);
}
}
}
else if (diff < 0) // move up
{
size_t i = 0;
for (auto it = list.begin(); it != list.end(); ++it, ++i)
move_fun(Mpd, *it - begin, pos+i);
if (Mpd.CommitCommandsList())
{
i = 0;
for (auto it = list.begin(); it != list.end(); ++it, ++i)
{
(*it)->setSelected(false);
m[pos+i].setSelected(true);
}
}
}
});
}
template <typename Iterator> void reverseSelectionHelper(Iterator first, Iterator last)
{
for (; first != last; ++first)
first->setSelected(!first->isSelected());
}
template <typename Iterator> std::string getSharedDirectory(Iterator first, Iterator last)
{
assert(first != last);
std::string result = first->getDirectory();
while (++first != last)
{
result = getSharedDirectory(result, first->getDirectory());
if (result == "/")
break;
}
return result;
}
void ParseArgv(int, char **);
template <typename T> struct StringConverter {
const char *operator()(const char *s) { return s; }
};
template <> struct StringConverter< NC::basic_buffer<wchar_t> > {
std::wstring operator()(const char *s) { return ToWString(s); }
};
template <> struct StringConverter<NC::Scrollpad> {
std::basic_string<my_char_t> operator()(const char *s) { return TO_WSTRING(s); }
};
template <typename C> void String2Buffer(const std::basic_string<C> &s, NC::basic_buffer<C> &buf)
{
StringConverter< NC::basic_buffer<C> > cnv;
for (auto it = s.begin(); it != s.end(); ++it)
{
if (*it == '$')
{
if (++it == s.end())
{
buf << '$';
break;
}
else if (isdigit(*it))
{
buf << NC::Color(*it-'0');
}
else
{
switch (*it)
{
case 'b':
buf << NC::fmtBold;
break;
case 'u':
buf << NC::fmtUnderline;
break;
case 'a':
buf << NC::fmtAltCharset;
break;
case 'r':
buf << NC::fmtReverse;
break;
case '/':
if (++it == s.end())
{
buf << cnv("$/");
break;
}
switch (*it)
{
case 'b':
buf << NC::fmtBoldEnd;
break;
case 'u':
buf << NC::fmtUnderlineEnd;
break;
case 'a':
buf << NC::fmtAltCharsetEnd;
break;
case 'r':
buf << NC::fmtReverseEnd;
break;
default:
buf << '$' << *--it;
break;
}
break;
default:
buf << *--it;
break;
}
}
}
else if (*it == MPD::Song::FormatEscapeCharacter)
{
// treat '$' as a normal character if song format escape char is prepended to it
if (++it == s.end() || *it != '$')
--it;
buf << *it;
}
else
buf << *it;
}
}
template <typename T> void ShowTime(T &buf, size_t length, bool short_names)
{
StringConverter<T> cnv;
const unsigned MINUTE = 60;
const unsigned HOUR = 60*MINUTE;
const unsigned DAY = 24*HOUR;
const unsigned YEAR = 365*DAY;
unsigned years = length/YEAR;
if (years)
{
buf << years << cnv(short_names ? "y" : (years == 1 ? " year" : " years"));
length -= years*YEAR;
if (length)
buf << cnv(", ");
}
unsigned days = length/DAY;
if (days)
{
buf << days << cnv(short_names ? "d" : (days == 1 ? " day" : " days"));
length -= days*DAY;
if (length)
buf << cnv(", ");
}
unsigned hours = length/HOUR;
if (hours)
{
buf << hours << cnv(short_names ? "h" : (hours == 1 ? " hour" : " hours"));
length -= hours*HOUR;
if (length)
buf << cnv(", ");
}
unsigned minutes = length/MINUTE;
if (minutes)
{
buf << minutes << cnv(short_names ? "m" : (minutes == 1 ? " minute" : " minutes"));
length -= minutes*MINUTE;
if (length)
buf << cnv(", ");
}
if (length)
buf << length << cnv(short_names ? "s" : (length == 1 ? " second" : " seconds"));
}
template <typename T> void ShowTag(T &buf, const std::string &tag)
{
if (tag.empty())
buf << Config.empty_tags_color << Config.empty_tag << NC::clEnd;
else
buf << tag;
}
std::string Timestamp(time_t t);
void markSongsInPlaylist(std::shared_ptr<ProxySongList> pl);
std::basic_string<my_char_t> Scroller(const std::basic_string<my_char_t> &str, size_t &pos, size_t width);
std::string Shorten(const std::basic_string<my_char_t> &s, size_t max_length);
#endif