/* $OpenBSD: cfg.c,v 1.92 2026/10/02 12:28:07 nicm Exp $ */

/*

 * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER

 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING

 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#include <sys/types.h>

#include <ctype.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "tmux.h"

struct client    *cfg_client;

int       cfg_finished;

static char   **cfg_causes;

static u_int      cfg_ncauses;

static struct cmdq_item  *cfg_item;

static int      cfg_started;

int                       cfg_quiet = 1;

char                    **cfg_files;

u_int                     cfg_nfiles;

static enum cmd_retval

cfg_client_done(struct cmdq_item *item, __unused void *data)

{

  if (cmdq_get_client(item)->flags & CLIENT_DEAD)

    return (CMD_RETURN_NORMAL);

  if (!cfg_finished)

    return (CMD_RETURN_WAIT);

  return (CMD_RETURN_NORMAL);

}

static enum cmd_retval

cfg_done(__unused struct cmdq_item *item, __unused void *data)

{

  if (cfg_finished)

    return (CMD_RETURN_NORMAL);

  cfg_finished = 1;

  cfg_show_causes(NULL);

  if (cfg_item != NULL) {

    cmdq_continue(cfg_item);

    cfg_item = NULL;

  }

  prompt_load_history();

  return (CMD_RETURN_NORMAL);

}

void

cfg_client_lost(struct client *c)

{

  if (c != cfg_client)

    return;

  cfg_client = NULL;

  if (cfg_item != NULL) {

    cmdq_continue(cfg_item);

    cfg_item = NULL;

  }

}

void

start_cfg(void)

{

  struct client  *c;

  u_int     i;

  int     flags = 0;

  /*

   * Configuration files are loaded without a client, so commands are run

   * in the global queue with item->client NULL.

   *

   * However, we must block the initial client (but just the initial

   * client) so that its command runs after the configuration is loaded.

   * Because start_cfg() is called so early, we can be sure the client's

   * command queue is currently empty and our callback will be at the

   * front - we need to get in before MSG_COMMAND.

   *

   * If the initial client is lost before the configuration finishes, the

   * next client to identify is first in the list and ends up here. Block

   * it instead, but do not load the files again.

   */

  cfg_client = c = TAILQ_FIRST(&clients);

  if (c != NULL) {

    cfg_item = cmdq_get_callback(cfg_client_done, NULL);

    cmdq_append(c, cfg_item);

  }

  if (cfg_started)

    return;

  cfg_started = 1;

  if (cfg_quiet)

    flags = CMD_PARSE_QUIET;

  for (i = 0; i < cfg_nfiles; i++)

    load_cfg(cfg_files[i], c, NULL, NULL, flags, NULL);

  cmdq_append(NULL, cmdq_get_callback(cfg_done, NULL));

}

int

load_cfg(const char *path, struct client *c, struct cmdq_item *item,

    struct cmd_find_state *current, int flags, struct cmdq_item **new_item)

{

  FILE      *f;

  struct cmd_parse_input   pi;

  struct cmd_parse_result *pr;

  struct cmdq_item  *new_item0;

  struct cmdq_state *state;

  if (new_item != NULL)

    *new_item = NULL;

  log_debug("loading %s", path);

  if ((f = fopen(path, "rb")) == NULL) {

    if (errno == ENOENT && (flags & CMD_PARSE_QUIET))

      return (0);

    cfg_add_cause("%s: %s", path, strerror(errno));

    return (-1);

  }

  memset(&pi, 0, sizeof pi);

  pi.flags = flags;

  pi.file = path;

  pi.line = 1;

  pi.item = item;

  pi.c = c;

  pr = cmd_parse_from_file(f, &pi);

  fclose(f);

  if (pr->status == CMD_PARSE_ERROR) {

    cfg_add_cause("%s", pr->error);

    free(pr->error);

    return (-1);

  }

  if (flags & CMD_PARSE_PARSEONLY) {

    cmd_list_free(pr->cmdlist);

    return (0);

  }

  if (item != NULL)

    state = cmdq_copy_state(cmdq_get_state(item), current);

  else

    state = cmdq_new_state(NULL, NULL, 0);

  cmdq_add_format(state, "current_file", "%s", pi.file);

  new_item0 = cmdq_get_command(pr->cmdlist, state);

  if (item != NULL)

    new_item0 = cmdq_insert_after(item, new_item0);

  else

    new_item0 = cmdq_append(NULL, new_item0);

  cmd_list_free(pr->cmdlist);

  cmdq_free_state(state);

  if (new_item != NULL)

    *new_item = new_item0;

  return (0);

}

int

load_cfg_from_buffer(const void *buf, size_t len, const char *path,

    struct client *c, struct cmdq_item *item, struct cmd_find_state *current,

    int flags, struct cmdq_item **new_item)

{

  struct cmd_parse_input   pi;

  struct cmd_parse_result *pr;

  struct cmdq_item  *new_item0;

  struct cmdq_state *state;

  if (new_item != NULL)

    *new_item = NULL;

  log_debug("loading %s", path);

  memset(&pi, 0, sizeof pi);

  pi.flags = flags;

  pi.file = path;

  pi.line = 1;

  pi.item = item;

  pi.c = c;

  pr = cmd_parse_from_buffer(buf, len, &pi);

  if (pr->status == CMD_PARSE_ERROR) {

    cfg_add_cause("%s", pr->error);

    free(pr->error);

    return (-1);

  }

  if (flags & CMD_PARSE_PARSEONLY) {

    cmd_list_free(pr->cmdlist);

    return (0);

  }

  if (item != NULL)

    state = cmdq_copy_state(cmdq_get_state(item), current);

  else

    state = cmdq_new_state(NULL, NULL, 0);

  cmdq_add_format(state, "current_file", "%s", pi.file);

  new_item0 = cmdq_get_command(pr->cmdlist, state);

  if (item != NULL)

    new_item0 = cmdq_insert_after(item, new_item0);

  else

    new_item0 = cmdq_append(NULL, new_item0);

  cmd_list_free(pr->cmdlist);

  cmdq_free_state(state);

  if (new_item != NULL)

    *new_item = new_item0;

  return (0);

}

void

cfg_add_cause(const char *fmt, ...)

{

  va_list  ap;

  char  *msg;

  va_start(ap, fmt);

  xvasprintf(&msg, fmt, ap);

  va_end(ap);

  cfg_ncauses++;

  cfg_causes = xreallocarray(cfg_causes, cfg_ncauses, sizeof *cfg_causes);

  cfg_causes[cfg_ncauses - 1] = msg;

}

void

cfg_print_causes(struct cmdq_item *item)

{

  struct client *c = cmdq_get_client(item);

  u_int    i;

  char    *cause;

  for (i = 0; i < cfg_ncauses; i++) {

    cause = cfg_causes[i];

    if (c != NULL && (c->flags & CLIENT_CONTROL))

      control_notify_write(c, "%%config-error %s", cause);

    else

      cmdq_print(item, "%s", cause);

    free(cause);

  }

  free(cfg_causes);

  cfg_causes = NULL;

  cfg_ncauses = 0;

}

void

cfg_show_causes(struct session *s)

{

  struct client     *c = TAILQ_FIRST(&clients);

  struct window_pane    *wp;

  struct window_mode_entry  *wme;

  u_int        i;

  char        *cause;

  if (cfg_ncauses == 0)

    return;

  if (c != NULL && (c->flags & CLIENT_CONTROL)) {

    for (i = 0; i < cfg_ncauses; i++) {

      cause = cfg_causes[i];

      control_notify_write(c, "%%config-error %s", cause);

      free(cause);

    }

    goto out;

  }

  if (s == NULL) {

    if (c != NULL && c->session != NULL)

      s = c->session;

    else

      s = RB_MIN(sessions, &sessions);

  }

  if (s == NULL || s->attached == 0) /* wait for an attached session */

    return;

  wp = s->curw->window->active;

  wme = TAILQ_FIRST(&wp->modes);

  if (wme == NULL || wme->mode != &window_view_mode)

    window_pane_set_mode(wp, NULL, &window_view_mode, NULL, NULL,

        NULL);

  for (i = 0; i < cfg_ncauses; i++) {

    window_copy_add(wp, 0, "%s", cfg_causes[i]);

    free(cfg_causes[i]);

  }

out:

  free(cfg_causes);

  cfg_causes = NULL;

  cfg_ncauses = 0;

}