helpline.c

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#include <stdio.h>
#include <string.h>

#include "gtk.h"
#include "../ui.h"
#include "../helpline.h"
#include "../../util/debug.h"

static void gtk_helpline_pop(void)
{
    if (!perf_gtk__is_active_context(pgctx))
        return;

    gtk_statusbar_pop(GTK_STATUSBAR(pgctx->statbar),
              pgctx->statbar_ctx_id);
}

static void gtk_helpline_push(const char *msg)
{
    if (!perf_gtk__is_active_context(pgctx))
        return;

    gtk_statusbar_push(GTK_STATUSBAR(pgctx->statbar),
               pgctx->statbar_ctx_id, msg);
}

static struct ui_helpline gtk_helpline_fns = {
    .pop    = gtk_helpline_pop,
    .push   = gtk_helpline_push,
};

void perf_gtk__init_helpline(void)
{
    helpline_fns = &gtk_helpline_fns;
}

int perf_gtk__show_helpline(const char *fmt, va_list ap)
{
    int ret;
    char *ptr;
    static int backlog;

    ret = vscnprintf(ui_helpline__current + backlog,
             sizeof(ui_helpline__current) - backlog, fmt, ap);
    backlog += ret;

    /* only first line can be displayed */
    ptr = strchr(ui_helpline__current, '\n');
    if (ptr && (ptr - ui_helpline__current) <= backlog) {
        *ptr = '\0';
        ui_helpline__puts(ui_helpline__current);
        backlog = 0;
    }

    return ret;
}