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/*
* Asynchronous readline-based interactive interface
*
* Actually not asynchronous so far, but intended to be.
*
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <nft.h>
#include <stdio.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#ifdef HAVE_LIBREADLINE
#include <readline/readline.h>
#include <readline/history.h>
#elif defined(HAVE_LIBEDIT)
#include <editline/readline.h>
#else
#include <linenoise.h>
#endif
#include <cli.h>
#include <list.h>
#define CMDLINE_HISTFILE ".nft.history"
#define CMDLINE_PROMPT "nft> "
#define CMDLINE_QUIT "quit"
static bool cli_quit;
static int cli_rc;
static void __cli_exit(int rc)
{
cli_quit = true;
cli_rc = rc;
}
static char histfile[PATH_MAX];
static void
init_histfile(void)
{
const char *home;
home = getenv("HOME");
if (home == NULL)
home = "";
snprintf(histfile, sizeof(histfile), "%s/%s", home, CMDLINE_HISTFILE);
}
#if defined(HAVE_LIBREADLINE)
static void nft_rl_prompt_save(void)
{
rl_save_prompt();
rl_clear_message();
rl_set_prompt(".... ");
}
#define nft_rl_prompt_restore rl_restore_prompt
#elif defined(HAVE_LIBEDIT)
static void nft_rl_prompt_save(void)
{
rl_set_prompt(".... ");
}
static void nft_rl_prompt_restore(void)
{
rl_set_prompt("nft> ");
}
#endif
#if defined(HAVE_LIBREADLINE) || defined(HAVE_LIBEDIT)
static struct nft_ctx *cli_nft;
static char *multiline;
static char *cli_append_multiline(char *line)
{
size_t len = strlen(line);
bool complete = false;
char *s;
if (len == 0)
return NULL;
if (line[len - 1] == '\\') {
line[len - 1] = '\0';
len--;
} else if (multiline == NULL)
return line;
else
complete = 1;
if (multiline == NULL) {
multiline = line;
nft_rl_prompt_save();
} else {
len += strlen(multiline);
s = malloc(len + 1);
if (!s) {
fprintf(stderr, "%s:%u: Memory allocation failure\n",
__FILE__, __LINE__);
cli_exit(EXIT_FAILURE);
return NULL;
}
snprintf(s, len + 1, "%s%s", multiline, line);
free(multiline);
multiline = s;
}
line = NULL;
if (complete) {
line = multiline;
multiline = NULL;
nft_rl_prompt_restore();
}
return line;
}
static void cli_complete(char *line)
{
const HIST_ENTRY *hist;
const char *c;
LIST_HEAD(msgs);
if (line == NULL) {
printf("\n");
return cli_exit(0);
}
line = cli_append_multiline(line);
if (line == NULL)
return;
for (c = line; *c != '\0'; c++)
if (!isspace(*c))
break;
if (*c == '\0')
return;
if (!strcmp(line, CMDLINE_QUIT))
return cli_exit(0);
/* avoid duplicate history entries */
hist = history_get(history_length);
if (hist == NULL || strcmp(hist->line, line))
add_history(line);
nft_run_cmd_from_buffer(cli_nft, line);
free(line);
}
#endif
#if defined(HAVE_LIBREADLINE)
static char **cli_completion(const char *text, int start, int end)
{
return NULL;
}
int cli_init(struct nft_ctx *nft)
{
cli_nft = nft;
rl_readline_name = (char *)"nft";
rl_instream = stdin;
rl_outstream = stdout;
rl_callback_handler_install(CMDLINE_PROMPT, cli_complete);
rl_attempted_completion_function = cli_completion;
init_histfile();
read_history(histfile);
history_set_pos(history_length);
while (!cli_quit)
rl_callback_read_char();
return cli_rc;
}
void cli_exit(int rc)
{
rl_callback_handler_remove();
rl_deprep_terminal();
write_history(histfile);
__cli_exit(rc);
}
#elif defined(HAVE_LIBEDIT)
int cli_init(struct nft_ctx *nft)
{
char *line;
cli_nft = nft;
rl_readline_name = (char *)"nft";
rl_instream = stdin;
rl_outstream = stdout;
init_histfile();
read_history(histfile);
history_set_pos(history_length);
rl_set_prompt(CMDLINE_PROMPT);
while (!cli_quit) {
line = readline(rl_prompt);
if (!line) {
cli_exit(0);
break;
}
line = cli_append_multiline(line);
if (!line)
continue;
cli_complete(line);
}
return cli_rc;
}
void cli_exit(int rc)
{
rl_deprep_terminal();
write_history(histfile);
__cli_exit(rc);
}
#else /* HAVE_LINENOISE */
int cli_init(struct nft_ctx *nft)
{
char *line;
init_histfile();
linenoiseHistoryLoad(histfile);
linenoiseSetMultiLine(1);
while (!cli_quit) {
line = linenoise(CMDLINE_PROMPT);
if (!line) {
cli_exit(0);
break;
}
if (strcmp(line, CMDLINE_QUIT) == 0) {
cli_exit(0);
} else if (line[0] != '\0') {
linenoiseHistoryAdd(line);
nft_run_cmd_from_buffer(nft, line);
}
linenoiseFree(line);
}
return cli_rc;
}
void cli_exit(int rc)
{
linenoiseHistorySave(histfile);
__cli_exit(rc);
}
#endif /* HAVE_LINENOISE */
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