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