linux/tools/perf/util/newt.c

#include <newt.h>
#include <signal.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <sys/ttydefaults.h>

#include "cache.h"
#include "debug.h"
#include "ui/browser.h"
#include "ui/helpline.h"

newtComponent newt_form__new(void);
int popup_menu(int argc, char * const argv[]);
int ui__help_window(const char *text);
bool dialog_yesno(const char *msg);

char browser__last_msg[1024];

int browser__show_help(const char *format, va_list ap)
{
	int ret;
	static int backlog;

        ret = vsnprintf(browser__last_msg + backlog,
			sizeof(browser__last_msg) - backlog, format, ap);
	backlog += ret;

	if (browser__last_msg[backlog - 1] == '\n') {
		ui_helpline__puts(browser__last_msg);
		newtRefresh();
		backlog = 0;
	}

	return ret;
}

static void newt_form__set_exit_keys(newtComponent self)
{
	newtFormAddHotKey(self, NEWT_KEY_LEFT);
	newtFormAddHotKey(self, NEWT_KEY_ESCAPE);
	newtFormAddHotKey(self, 'Q');
	newtFormAddHotKey(self, 'q');
	newtFormAddHotKey(self, CTRL('c'));
}

newtComponent newt_form__new(void)
{
	newtComponent self = newtForm(NULL, NULL, 0);
	if (self)
		newt_form__set_exit_keys(self);
	return self;
}

int popup_menu(int argc, char * const argv[])
{
	struct newtExitStruct es;
	int i, rc = -1, max_len = 5;
	newtComponent listbox, form = newt_form__new();

	if (form == NULL)
		return -1;

	listbox = newtListbox(0, 0, argc, NEWT_FLAG_RETURNEXIT);
	if (listbox == NULL)
		goto out_destroy_form;

	newtFormAddComponent(form, listbox);

	for (i = 0; i < argc; ++i) {
		int len = strlen(argv[i]);
		if (len > max_len)
			max_len = len;
		if (newtListboxAddEntry(listbox, argv[i], (void *)(long)i))
			goto out_destroy_form;
	}

	newtCenteredWindow(max_len, argc, NULL);
	newtFormRun(form, &es);
	rc = newtListboxGetCurrent(listbox) - NULL;
	if (es.reason == NEWT_EXIT_HOTKEY)
		rc = -1;
	newtPopWindow();
out_destroy_form:
	newtFormDestroy(form);
	return rc;
}

int ui__help_window(const char *text)
{
	struct newtExitStruct es;
	newtComponent tb, form = newt_form__new();
	int rc = -1;
	int max_len = 0, nr_lines = 0;
	const char *t;

	if (form == NULL)
		return -1;

	t = text;
	while (1) {
		const char *sep = strchr(t, '\n');
		int len;

		if (sep == NULL)
			sep = strchr(t, '\0');
		len = sep - t;
		if (max_len < len)
			max_len = len;
		++nr_lines;
		if (*sep == '\0')
			break;
		t = sep + 1;
	}

	tb = newtTextbox(0, 0, max_len, nr_lines, 0);
	if (tb == NULL)
		goto out_destroy_form;

	newtTextboxSetText(tb, text);
	newtFormAddComponent(form, tb);
	newtCenteredWindow(max_len, nr_lines, NULL);
	newtFormRun(form, &es);
	newtPopWindow();
	rc = 0;
out_destroy_form:
	newtFormDestroy(form);
	return rc;
}

bool dialog_yesno(const char *msg)
{
	/* newtWinChoice should really be accepting const char pointers... */
	char yes[] = "Yes", no[] = "No";
	return newtWinChoice(NULL, yes, no, (char *)msg) == 1;
}

static void newt_suspend(void *d __used)
{
	newtSuspend();
	raise(SIGTSTP);
	newtResume();
}

void setup_browser(void)
{
	if (!isatty(1) || !use_browser || dump_trace) {
		use_browser = 0;
		setup_pager();
		return;
	}

	use_browser = 1;
	newtInit();
	newtCls();
	newtSetSuspendCallback(newt_suspend, NULL);
	ui_helpline__puts(" ");
	ui_browser__init();
}

void exit_browser(bool wait_for_ok)
{
	if (use_browser > 0) {
		if (wait_for_ok) {
			char title[] = "Fatal Error", ok[] = "Ok";
			newtWinMessage(title, ok, browser__last_msg);
		}
		newtFinished();
	}
}