lnav/src/term_extra.hh

/**
 * Copyright (c) 2014, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * * Neither the name of Timothy Stack nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @file term_extra.hh
 */

#ifndef term_extra_hh
#define term_extra_hh

#include <string.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <sys/param.h>

#include <string>

#include "logfile.hh"
#include "log_format.hh"
#include "listview_curses.hh"

class term_extra {
public:
    term_extra() {
        const char *term_name = getenv("TERM");

        this->te_enabled = (term_name != NULL && strstr(term_name, "xterm") != NULL);

        if (getenv("SSH_CONNECTION") != NULL) {
            char hostname[MAXHOSTNAMELEN] = "UNKNOWN";
            struct passwd *userent;

            gethostname(hostname, sizeof(hostname));
            this->te_prefix = hostname;
            if ((userent = getpwuid(getuid())) != NULL) {
                this->te_prefix = std::string(userent->pw_name) + "@" + this->te_prefix;
            }
            this->te_prefix += ":";
        }
    };

    void update_title(listview_curses *lc) {
        static const char *xterm_title_fmt = "\033]0;%s\007";

        if (!this->te_enabled) {
            return;
        }

        if (lc->get_inner_height() > 0) {
            string_attrs_t::const_iterator line_attr;
            std::vector<attr_line_t> rows(1);

            lc->get_data_source()->listview_value_for_rows(*lc, lc->get_top(), rows);
            string_attrs_t &sa = rows[0].get_attrs();
            line_attr = find_string_attr(sa, &logline::L_FILE);
            if (line_attr != sa.end()) {
                logfile *lf = (logfile *)line_attr->sa_value.sav_ptr;
                const std::string &filename = lf->get_filename();

                if (filename != this->te_last_title) {
                    std::string title = this->te_prefix + filename;

                    printf(xterm_title_fmt, title.c_str());
                    fflush(stdout);

                    this->te_last_title = filename;
                }
                return;
            }
        }

        const std::string &view_title = lc->get_title();

        if (view_title != this->te_last_title) {
            std::string title = this->te_prefix + view_title;

            printf(xterm_title_fmt, title.c_str());
            fflush(stdout);

            this->te_last_title = view_title;
        }
    };

private:
    bool te_enabled;
    std::string te_prefix;
    std::string te_last_title;
};

#endif