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/**
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* Copyright (c) 2007-2012, Timothy Stack
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * Neither the name of Timothy Stack nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @file view_curses.hh
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*/
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#ifndef view_curses_hh
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#define view_curses_hh
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#include <limits.h>
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#include <signal.h>
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#include <stdint.h>
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#include <sys/time.h>
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#include <zlib.h>
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#include "config.h"
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#if defined HAVE_NCURSESW_CURSES_H
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# include <ncursesw/curses.h>
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#elif defined HAVE_NCURSESW_H
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# include <ncursesw.h>
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#elif defined HAVE_NCURSES_CURSES_H
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# include <ncurses/curses.h>
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#elif defined HAVE_NCURSES_H
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# include <ncurses.h>
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#elif defined HAVE_CURSES_H
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# include <curses.h>
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#else
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# error "SysV or X/Open-compatible Curses header file required"
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#endif
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#include <functional>
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#include <map>
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#include <string>
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#include <vector>
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#include "base/attr_line.hh"
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#include "base/enum_util.hh"
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#include "base/lnav_log.hh"
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#include "base/lrucache.hpp"
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#include "base/opt_util.hh"
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#include "lnav_config_fwd.hh"
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#include "log_level.hh"
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#include "optional.hpp"
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#include "styling.hh"
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#define KEY_CTRL_A 0x01
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#define KEY_CTRL_E 0x05
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#define KEY_CTRL_G 7
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#define KEY_CTRL_L 12
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#define KEY_CTRL_P 16
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#define KEY_CTRL_R 18
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#define KEY_CTRL_W 23
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class view_curses;
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/**
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* An RAII class that initializes and deinitializes curses.
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*/
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class screen_curses : public log_crash_recoverer {
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public:
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static Result<screen_curses, std::string> create();
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void log_crash_recover() override
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{
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if (this->sc_main_window != nullptr) {
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endwin();
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}
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}
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virtual ~screen_curses()
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{
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if (this->sc_main_window != nullptr) {
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endwin();
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}
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}
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screen_curses(screen_curses&& other)
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: sc_main_window(std::exchange(other.sc_main_window, nullptr))
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{
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}
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screen_curses(const screen_curses&) = delete;
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screen_curses& operator=(screen_curses&& other)
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{
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this->sc_main_window = std::exchange(other.sc_main_window, nullptr);
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return *this;
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}
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WINDOW* get_window() { return this->sc_main_window; }
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private:
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screen_curses(WINDOW* win) : sc_main_window(win) {}
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WINDOW* sc_main_window;
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};
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template<typename T>
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class action_broadcaster : public std::vector<std::function<void(T*)>> {
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public:
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void operator()(T* t)
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{
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for (auto& func : *this) {
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func(t);
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}
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}
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};
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class ui_periodic_timer {
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public:
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static const struct itimerval INTERVAL;
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static ui_periodic_timer& singleton();
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bool time_to_update(sig_atomic_t& counter) const
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{
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if (this->upt_counter != counter) {
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counter = this->upt_counter;
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return true;
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}
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return false;
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}
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void start_fade(sig_atomic_t& counter, size_t decay) const
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{
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counter = this->upt_counter + decay;
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}
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int fade_diff(sig_atomic_t& counter) const
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{
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if (this->upt_counter >= counter) {
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return 0;
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}
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return counter - this->upt_counter;
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}
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private:
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ui_periodic_timer();
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static void sigalrm(int sig);
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volatile sig_atomic_t upt_counter;
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};
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class alerter {
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public:
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static alerter& singleton();
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void enabled(bool enable) { this->a_enabled = enable; }
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bool chime(std::string msg);
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void new_input(int ch)
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{
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if (this->a_last_input != ch) {
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this->a_do_flash = true;
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}
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this->a_last_input = ch;
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}
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private:
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bool a_enabled{true};
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bool a_do_flash{true};
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int a_last_input{-1};
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};
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/**
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* Singleton used to manage the colorspace.
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*/
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class view_colors {
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public:
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static constexpr unsigned long HI_COLOR_COUNT = 6 * 3 * 3;
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/** @return A reference to the singleton. */
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static view_colors& singleton();
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view_colors(const view_colors&) = delete;
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view_colors(view_colors&&) = delete;
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view_colors& operator=(const view_colors&) = delete;
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view_colors& operator=(view_colors&&) = delete;
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/**
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* Performs curses-specific initialization. The other methods can be
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* called before this method, but the returned attributes cannot be used
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* with curses code until this method is called.
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*/
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static void init();
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void init_roles(const lnav_theme& lt,
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lnav_config_listener::error_reporter& reporter);
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/**
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* @param role The role to retrieve character attributes for.
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* @return The attributes to use for the given role.
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*/
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text_attrs attrs_for_role(role_t role, bool selected = false) const
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{
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if (role == role_t::VCR_NONE) {
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return {};
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}
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require(role > role_t::VCR_NONE);
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require(role < role_t::VCR__MAX);
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return selected
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? this->vc_role_attrs[lnav::enums::to_underlying(role)].second
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: this->vc_role_attrs[lnav::enums::to_underlying(role)].first;
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}
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text_attrs reverse_attrs_for_role(role_t role) const
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{
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require(role > role_t::VCR_NONE);
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require(role < role_t::VCR__MAX);
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return this->vc_role_reverse_colors[lnav::enums::to_underlying(role)];
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}
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nonstd::optional<short> color_for_ident(const char* str, size_t len) const;
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nonstd::optional<short> color_for_ident(const string_fragment& sf) const
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{
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return this->color_for_ident(sf.data(), sf.length());
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}
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text_attrs attrs_for_ident(const char* str, size_t len) const;
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text_attrs attrs_for_ident(intern_string_t str) const
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{
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return this->attrs_for_ident(str.get(), str.size());
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}
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text_attrs attrs_for_ident(const std::string& str) const
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{
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return this->attrs_for_ident(str.c_str(), str.length());
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}
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int ensure_color_pair(short fg, short bg);
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int ensure_color_pair(nonstd::optional<short> fg,
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nonstd::optional<short> bg);
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int ensure_color_pair(const styling::color_unit& fg,
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const styling::color_unit& bg);
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static constexpr short MATCH_COLOR_DEFAULT = -1;
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static constexpr short MATCH_COLOR_SEMANTIC = -10;
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nonstd::optional<short> match_color(const styling::color_unit& color) const;
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std::pair<text_attrs, text_attrs> to_attrs(
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const lnav_theme& lt,
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const style_config& sc,
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const style_config& fallback_sc,
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lnav_config_listener::error_reporter& reporter);
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std::pair<text_attrs, text_attrs> vc_level_attrs[LEVEL__MAX];
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short ansi_to_theme_color(short ansi_fg) const
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{
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return this->vc_ansi_to_theme[ansi_fg];
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}
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struct roles {
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static string_attr_pair file();
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};
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static bool initialized;
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private:
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static term_color_palette* vc_active_palette;
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/** Private constructor that initializes the member fields. */
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view_colors();
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struct dyn_pair {
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int dp_color_pair;
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};
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/** Map of role IDs to attribute values. */
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std::pair<text_attrs, text_attrs>
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vc_role_attrs[lnav::enums::to_underlying(role_t::VCR__MAX)];
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/** Map of role IDs to reverse-video attribute values. */
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text_attrs
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vc_role_reverse_colors[lnav::enums::to_underlying(role_t::VCR__MAX)];
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short vc_ansi_to_theme[8];
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short vc_highlight_colors[HI_COLOR_COUNT];
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int vc_color_pair_end{0};
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cache::lru_cache<std::pair<short, short>, dyn_pair> vc_dyn_pairs;
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};
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enum class mouse_button_t {
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BUTTON_LEFT,
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BUTTON_MIDDLE,
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BUTTON_RIGHT,
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BUTTON_SCROLL_UP,
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BUTTON_SCROLL_DOWN,
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};
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enum class mouse_button_state_t {
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BUTTON_STATE_PRESSED,
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BUTTON_STATE_DRAGGED,
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BUTTON_STATE_RELEASED,
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};
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struct mouse_event {
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mouse_event(mouse_button_t button = mouse_button_t::BUTTON_LEFT,
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mouse_button_state_t state
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= mouse_button_state_t::BUTTON_STATE_PRESSED,
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int x = -1,
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int y = -1)
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: me_button(button), me_state(state), me_x(x), me_y(y)
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{
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}
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mouse_button_t me_button;
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mouse_button_state_t me_state;
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struct timeval me_time {};
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int me_x;
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int me_y;
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};
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/**
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* Interface for "view" classes that will update a curses(3) display.
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*/
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class view_curses {
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public:
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virtual ~view_curses() = default;
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/**
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* Update the curses display.
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*/
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virtual void do_update()
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{
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this->vc_needs_update = false;
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if (!this->vc_visible) {
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return;
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}
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for (auto* child : this->vc_children) {
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child->do_update();
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}
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}
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virtual bool handle_mouse(mouse_event& me) { return false; }
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void set_needs_update()
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{
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this->vc_needs_update = true;
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for (auto* child : this->vc_children) {
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child->set_needs_update();
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}
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}
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bool get_needs_update() const { return this->vc_needs_update; }
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view_curses& add_child_view(view_curses* child)
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{
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this->vc_children.push_back(child);
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return *this;
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}
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void set_default_role(role_t role) { this->vc_default_role = role; }
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void set_visible(bool value) { this->vc_visible = value; }
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bool is_visible() const { return this->vc_visible; }
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void set_width(long width) { this->vc_width = width; }
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long get_width() const { return this->vc_width; }
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static void awaiting_user_input();
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static size_t mvwattrline(WINDOW* window,
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int y,
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int x,
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attr_line_t& al,
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const struct line_range& lr,
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role_t base_role = role_t::VCR_TEXT);
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protected:
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bool vc_visible{true};
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/** Flag to indicate if a display update is needed. */
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bool vc_needs_update{true};
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long vc_width;
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std::vector<view_curses*> vc_children;
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role_t vc_default_role{role_t::VCR_TEXT};
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};
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template<class T>
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class view_stack : public view_curses {
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public:
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using iterator = typename std::vector<T*>::iterator;
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nonstd::optional<T*> top()
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{
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if (this->vs_views.empty()) {
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return nonstd::nullopt;
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}
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return this->vs_views.back();
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}
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void do_update() override
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{
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if (!this->vc_visible) {
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return;
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}
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this->top() | [this](T* vc) {
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if (this->vc_needs_update) {
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vc->set_needs_update();
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}
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vc->do_update();
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};
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view_curses::do_update();
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this->vc_needs_update = false;
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}
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void push_back(T* view)
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{
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this->vs_views.push_back(view);
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if (this->vs_change_handler) {
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this->vs_change_handler(view);
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}
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this->set_needs_update();
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}
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void pop_back()
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{
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this->vs_views.pop_back();
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if (!this->vs_views.empty() && this->vs_change_handler) {
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this->vs_change_handler(this->vs_views.back());
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}
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this->set_needs_update();
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}
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iterator find(T* view) const
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{
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return std::find(this->begin(), this->end(), view);
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}
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iterator begin() { return this->vs_views.begin(); }
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iterator end() { return this->vs_views.end(); }
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size_t size() const { return this->vs_views.size(); }
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bool empty() const { return this->vs_views.empty(); }
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std::function<void(T*)> vs_change_handler;
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private:
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std::vector<T*> vs_views;
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};
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#endif
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