header.c

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// SPDX-License-Identifier: GPL-2.0
#include "util/cache.h"
#include "util/debug.h"
#include "ui/browser.h"
#include "ui/keysyms.h"
#include "ui/ui.h"
#include "ui/util.h"
#include "ui/libslang.h"
#include "util/header.h"
#include "util/session.h"

#include <sys/ttydefaults.h>

static void ui_browser__argv_write(struct ui_browser *browser,
                   void *entry, int row)
{
    char **arg = entry;
    char *str = *arg;
    char empty[] = " ";
    bool current_entry = ui_browser__is_current_entry(browser, row);
    unsigned long offset = (unsigned long)browser->priv;

    if (offset >= strlen(str))
        str = empty;
    else
        str = str + offset;

    ui_browser__set_color(browser, current_entry ? HE_COLORSET_SELECTED :
                               HE_COLORSET_NORMAL);

    ui_browser__write_nstring(browser, str, browser->width);
}

static int list_menu__run(struct ui_browser *menu)
{
    int key;
    unsigned long offset;
    const char help[] =
    "h/?/F1        Show this window\n"
    "UP/DOWN/PGUP\n"
    "PGDN/SPACE\n"
    "LEFT/RIGHT    Navigate\n"
    "q/ESC/CTRL+C  Exit browser";

    if (ui_browser__show(menu, "Header information", "Press 'q' to exit") < 0)
        return -1;

    while (1) {
        key = ui_browser__run(menu, 0);

        switch (key) {
        case K_RIGHT:
            offset = (unsigned long)menu->priv;
            offset += 10;
            menu->priv = (void *)offset;
            continue;
        case K_LEFT:
            offset = (unsigned long)menu->priv;
            if (offset >= 10)
                offset -= 10;
            menu->priv = (void *)offset;
            continue;
        case K_F1:
        case 'h':
        case '?':
            ui_browser__help_window(menu, help);
            continue;
        case K_ESC:
        case 'q':
        case CTRL('c'):
            key = -1;
            break;
        default:
            continue;
        }

        break;
    }

    ui_browser__hide(menu);
    return key;
}

static int ui__list_menu(int argc, char * const argv[])
{
    struct ui_browser menu = {
        .entries    = (void *)argv,
        .refresh    = ui_browser__argv_refresh,
        .seek       = ui_browser__argv_seek,
        .write      = ui_browser__argv_write,
        .nr_entries = argc,
    };

    return list_menu__run(&menu);
}

int tui__header_window(struct perf_env *env)
{
    int i, argc = 0;
    char **argv;
    struct perf_session *session;
    char *ptr, *pos;
    size_t size;
    FILE *fp = open_memstream(&ptr, &size);

    session = container_of(env, struct perf_session, header.env);
    perf_header__fprintf_info(session, fp, true);
    fclose(fp);

    for (pos = ptr, argc = 0; (pos = strchr(pos, '\n')) != NULL; pos++)
        argc++;

    argv = calloc(argc + 1, sizeof(*argv));
    if (argv == NULL)
        goto out;

    argv[0] = pos = ptr;
    for (i = 1; (pos = strchr(pos, '\n')) != NULL; i++) {
        *pos++ = '\0';
        argv[i] = pos;
    }

    BUG_ON(i != argc + 1);

    ui__list_menu(argc, argv);

out:
    free(argv);
    free(ptr);
    return 0;
}