libcruft-util/term.cpp

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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2016-2017 Danny Robson <danny@nerdcruft.net>
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*/
#include "term.hpp"
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#include "string.hpp"
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#include <experimental/filesystem>
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#include <cstdlib>
#include <stdexcept>
using util::term::csi::graphics;
static const std::experimental::filesystem::path DEFAULT_SEARCH_DIR = "/usr/share/terminfo";
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const graphics graphics::RESET (0);
///////////////////////////////////////////////////////////////////////////////
// find the terminfo path within a directory, for a key
//
// throws an exception if not found
static
std::experimental::filesystem::path
find_terminfo_path (const std::experimental::filesystem::path &dir,
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const std::string &key)
{
const char letter[2] = { key[0], '\0' };
auto candidate = dir / letter / key;
if (!std::experimental::filesystem::is_directory (candidate))
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throw std::runtime_error ("path not found");
return candidate;
}
//-----------------------------------------------------------------------------
// find the terminfo path for a given key.
//
// throws an exception if not found
static
std::experimental::filesystem::path
find_terminfo_path [[gnu::unused]] (const std::string &key)
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{
// check if the path is explicitly listed. must not fall through.
if (const char *dir = getenv ("TERMINFO")) {
return find_terminfo_path (dir, key);
}
// check if we have a path at $HOME. falls through.
if (const char *home = getenv ("HOME")) {
std::experimental::filesystem::path HOME (home);
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try {
return find_terminfo_path (HOME / ".terminfo", key);
} catch (...) { }
}
// check colon seperated list in TERMINFO_DIRS
if (const char *dirs = getenv ("TERMINFO_DIRS")) {
auto tok = util::tokeniser (dirs, ':');
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for (auto i: tok) {
try {
return find_terminfo_path (
i.empty () ?
DEFAULT_SEARCH_DIR :
std::experimental::filesystem::path (i.cbegin (), i.cend ()), key
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);
} catch (...) { }
}
}
return find_terminfo_path ("/usr/share/terminfo", key);
}
///////////////////////////////////////////////////////////////////////////////
bool
util::term::has_csi_support (void)
{
// HACK: this will do until we get a terminfo/termcap reader
return getenv ("TERM") == std::string ("XTERM");
}
///////////////////////////////////////////////////////////////////////////////
graphics::graphics (layer _layer, hue _hue):
m_value (_layer + _hue)
{ ; }
//-----------------------------------------------------------------------------
graphics::graphics (char _value):
m_value (_value)
{ ; }
///////////////////////////////////////////////////////////////////////////////
char
graphics::value (void) const
{
return m_value;
}
//-----------------------------------------------------------------------------
char
graphics::value (char _value)
{
return m_value = _value;
}
///////////////////////////////////////////////////////////////////////////////
std::ostream&
util::term::csi::operator<< (std::ostream &os, graphics g)
{
return os << code::CSI << '[' << +g.value () << decltype(g)::terminator;
}