/src/tmux/cmd-find.c

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/* $OpenBSD$ */

/*
 * Copyright (c) 2015 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 <fnmatch.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

static int  cmd_find_session_better(struct session *, struct session *,
        int);
static struct session *cmd_find_best_session(struct session **, u_int, int);
static int  cmd_find_best_session_with_window(struct cmd_find_state *);
static int  cmd_find_best_winlink_with_window(struct cmd_find_state *);

static const char *cmd_find_map_table(const char *[][2], const char *);

static void cmd_find_log_state(const char *, struct cmd_find_state *);
static int  cmd_find_get_session(struct cmd_find_state *, const char *);
static int  cmd_find_get_window(struct cmd_find_state *, const char *, int);
static int  cmd_find_get_window_with_session(struct cmd_find_state *,
        const char *);
static int  cmd_find_get_pane(struct cmd_find_state *, const char *, int);
static int  cmd_find_get_pane_with_session(struct cmd_find_state *,
        const char *);
static int  cmd_find_get_pane_with_window(struct cmd_find_state *,
        const char *);

static const char *cmd_find_session_table[][2] = {
  { NULL, NULL }
};
static const char *cmd_find_window_table[][2] = {
  { "{start}", "^" },
  { "{last}", "!" },
  { "{end}", "$" },
  { "{next}", "+" },
  { "{previous}", "-" },
  { NULL, NULL }
};
static const char *cmd_find_pane_table[][2] = {
  { "{last}", "!" },
  { "{next}", "+" },
  { "{previous}", "-" },
  { "{top}", "top" },
  { "{bottom}", "bottom" },
  { "{left}", "left" },
  { "{right}", "right" },
  { "{top-left}", "top-left" },
  { "{top-right}", "top-right" },
  { "{bottom-left}", "bottom-left" },
  { "{bottom-right}", "bottom-right" },
  { "{up-of}", "{up-of}" },
  { "{down-of}", "{down-of}" },
  { "{left-of}", "{left-of}" },
  { "{right-of}", "{right-of}" },
  { NULL, NULL }
};

/* Find pane containing client if any. */
static struct window_pane *
cmd_find_inside_pane(struct client *c)
{
  struct window_pane  *wp;
  struct environ_entry  *envent;

  if (c == NULL)
    return (NULL);

  RB_FOREACH(wp, window_pane_tree, &all_window_panes) {
    if (wp->fd != -1 && strcmp(wp->tty, c->ttyname) == 0)
      break;
  }
  if (wp == NULL) {
    envent = environ_find(c->environ, "TMUX_PANE");
    if (envent != NULL)
      wp = window_pane_find_by_id_str(envent->value);
  }
  if (wp != NULL)
    log_debug("%s: got pane %%%u (%s)", __func__, wp->id, wp->tty);
  return (wp);
}

/* Is this client better? */
static int
cmd_find_client_better(struct client *c, struct client *than)
{
  if (than == NULL)
    return (1);
  return (timercmp(&c->activity_time, &than->activity_time, >));
}

/* Find best client for session. */
struct client *
cmd_find_best_client(struct session *s)
{
  struct client *c_loop, *c;

  if (s->attached == 0)
    s = NULL;

  c = NULL;
  TAILQ_FOREACH(c_loop, &clients, entry) {
    if (c_loop->session == NULL)
      continue;
    if (s != NULL && c_loop->session != s)
      continue;
    if (cmd_find_client_better(c_loop, c))
      c = c_loop;
  }
  return (c);
}

/* Is this session better? */
static int
cmd_find_session_better(struct session *s, struct session *than, int flags)
{
  int attached;

  if (than == NULL)
    return (1);
  if (flags & CMD_FIND_PREFER_UNATTACHED) {
    attached = (than->attached != 0);
    if (attached && s->attached == 0)
      return (1);
    else if (!attached && s->attached != 0)
      return (0);
  }
  return (timercmp(&s->activity_time, &than->activity_time, >));
}

/* Find best session from a list, or all if list is NULL. */
static struct session *
cmd_find_best_session(struct session **slist, u_int ssize, int flags)
{
  struct session   *s_loop, *s;
  u_int     i;

  log_debug("%s: %u sessions to try", __func__, ssize);

  s = NULL;
  if (slist != NULL) {
    for (i = 0; i < ssize; i++) {
      if (cmd_find_session_better(slist[i], s, flags))
        s = slist[i];
    }
  } else {
    RB_FOREACH(s_loop, sessions, &sessions) {
      if (cmd_find_session_better(s_loop, s, flags))
        s = s_loop;
    }
  }
  return (s);
}

/* Find best session and winlink for window. */
static int
cmd_find_best_session_with_window(struct cmd_find_state *fs)
{
  struct session  **slist = NULL;
  u_int     ssize;
  struct session   *s;

  log_debug("%s: window is @%u", __func__, fs->w->id);

  ssize = 0;
  RB_FOREACH(s, sessions, &sessions) {
    if (!session_has(s, fs->w))
      continue;
    slist = xreallocarray(slist, ssize + 1, sizeof *slist);
    slist[ssize++] = s;
  }
  if (ssize == 0)
    goto fail;
  fs->s = cmd_find_best_session(slist, ssize, fs->flags);
  if (fs->s == NULL)
    goto fail;
  free(slist);
  return (cmd_find_best_winlink_with_window(fs));

fail:
  free(slist);
  return (-1);
}

/*
 * Find the best winlink for a window (the current if it contains the window,
 * otherwise the first).
 */
static int
cmd_find_best_winlink_with_window(struct cmd_find_state *fs)
{
  struct winlink   *wl, *wl_loop;

  log_debug("%s: window is @%u", __func__, fs->w->id);

  wl = NULL;
  if (fs->s->curw != NULL && fs->s->curw->window == fs->w)
    wl = fs->s->curw;
  else {
    RB_FOREACH(wl_loop, winlinks, &fs->s->windows) {
      if (wl_loop->window == fs->w) {
        wl = wl_loop;
        break;
      }
    }
  }
  if (wl == NULL)
    return (-1);
  fs->wl = wl;
  fs->idx = fs->wl->idx;
  return (0);
}

/* Maps string in table. */
static const char *
cmd_find_map_table(const char *table[][2], const char *s)
{
  u_int i;

  for (i = 0; table[i][0] != NULL; i++) {
    if (strcmp(s, table[i][0]) == 0)
      return (table[i][1]);
  }
  return (s);
}

/* Find session from string. Fills in s. */
static int
cmd_find_get_session(struct cmd_find_state *fs, const char *session)
{
  struct session  *s, *s_loop;
  struct client *c;

  log_debug("%s: %s", __func__, session);

  /* Check for session ids starting with $. */
  if (*session == '$') {
    fs->s = session_find_by_id_str(session);
    if (fs->s == NULL)
      return (-1);
    return (0);
  }

  /* Look for exactly this session. */
  fs->s = session_find(session);
  if (fs->s != NULL)
    return (0);

  /* Look for as a client. */
  c = cmd_find_client(NULL, session, 1);
  if (c != NULL && c->session != NULL) {
    fs->s = c->session;
    return (0);
  }

  /* Stop now if exact only. */
  if (fs->flags & CMD_FIND_EXACT_SESSION)
    return (-1);

  /* Otherwise look for prefix. */
  s = NULL;
  RB_FOREACH(s_loop, sessions, &sessions) {
    if (strncmp(session, s_loop->name, strlen(session)) == 0) {
      if (s != NULL)
        return (-1);
      s = s_loop;
    }
  }
  if (s != NULL) {
    fs->s = s;
    return (0);
  }

  /* Then as a pattern. */
  s = NULL;
  RB_FOREACH(s_loop, sessions, &sessions) {
    if (fnmatch(session, s_loop->name, 0) == 0) {
      if (s != NULL)
        return (-1);
      s = s_loop;
    }
  }
  if (s != NULL) {
    fs->s = s;
    return (0);
  }

  return (-1);
}

/* Find window from string. Fills in s, wl, w. */
static int
cmd_find_get_window(struct cmd_find_state *fs, const char *window, int only)
{
  log_debug("%s: %s", __func__, window);

  /* Check for window ids starting with @. */
  if (*window == '@') {
    fs->w = window_find_by_id_str(window);
    if (fs->w == NULL)
      return (-1);
    return (cmd_find_best_session_with_window(fs));
  }

  /* Not a window id, so use the current session. */
  fs->s = fs->current->s;

  /* We now only need to find the winlink in this session. */
  if (cmd_find_get_window_with_session(fs, window) == 0)
    return (0);

  /* Otherwise try as a session itself. */
  if (!only && cmd_find_get_session(fs, window) == 0) {
    fs->wl = fs->s->curw;
    fs->w = fs->wl->window;
    if (~fs->flags & CMD_FIND_WINDOW_INDEX)
      fs->idx = fs->wl->idx;
    return (0);
  }

  return (-1);
}

/*
 * Find window from string, assuming it is in given session. Needs s, fills in
 * wl and w.
 */
static int
cmd_find_get_window_with_session(struct cmd_find_state *fs, const char *window)
{
  struct winlink  *wl;
  const char  *errstr;
  int    idx, n, exact;
  struct session  *s;

  log_debug("%s: %s", __func__, window);
  exact = (fs->flags & CMD_FIND_EXACT_WINDOW);

  /*
   * Start with the current window as the default. So if only an index is
   * found, the window will be the current.
   */
  fs->wl = fs->s->curw;
  fs->w = fs->wl->window;

  /* Check for window ids starting with @. */
  if (*window == '@') {
    fs->w = window_find_by_id_str(window);
    if (fs->w == NULL || !session_has(fs->s, fs->w))
      return (-1);
    return (cmd_find_best_winlink_with_window(fs));
  }

  /* Try as an offset. */
  if (!exact && (window[0] == '+' || window[0] == '-')) {
    if (window[1] != '\0')
      n = strtonum(window + 1, 1, INT_MAX, NULL);
    else
      n = 1;
    s = fs->s;
    if (fs->flags & CMD_FIND_WINDOW_INDEX) {
      if (window[0] == '+') {
        if (INT_MAX - s->curw->idx < n)
          return (-1);
        fs->idx = s->curw->idx + n;
      } else {
        if (n > s->curw->idx)
          return (-1);
        fs->idx = s->curw->idx - n;
      }
      return (0);
    }
    if (window[0] == '+')
      fs->wl = winlink_next_by_number(s->curw, s, n);
    else
      fs->wl = winlink_previous_by_number(s->curw, s, n);
    if (fs->wl != NULL) {
      fs->idx = fs->wl->idx;
      fs->w = fs->wl->window;
      return (0);
    }
  }

  /* Try special characters. */
  if (!exact) {
    if (strcmp(window, "!") == 0) {
      fs->wl = TAILQ_FIRST(&fs->s->lastw);
      if (fs->wl == NULL)
        return (-1);
      fs->idx = fs->wl->idx;
      fs->w = fs->wl->window;
      return (0);
    } else if (strcmp(window, "^") == 0) {
      fs->wl = RB_MIN(winlinks, &fs->s->windows);
      if (fs->wl == NULL)
        return (-1);
      fs->idx = fs->wl->idx;
      fs->w = fs->wl->window;
      return (0);
    } else if (strcmp(window, "$") == 0) {
      fs->wl = RB_MAX(winlinks, &fs->s->windows);
      if (fs->wl == NULL)
        return (-1);
      fs->idx = fs->wl->idx;
      fs->w = fs->wl->window;
      return (0);
    }
  }

  /* First see if this is a valid window index in this session. */
  if (window[0] != '+' && window[0] != '-') {
    idx = strtonum(window, 0, INT_MAX, &errstr);
    if (errstr == NULL) {
      fs->wl = winlink_find_by_index(&fs->s->windows, idx);
      if (fs->wl != NULL) {
        fs->idx = fs->wl->idx;
        fs->w = fs->wl->window;
        return (0);
      }
      if (fs->flags & CMD_FIND_WINDOW_INDEX) {
        fs->idx = idx;
        return (0);
      }
    }
  }

  /* Look for exact matches, error if more than one. */
  fs->wl = NULL;
  RB_FOREACH(wl, winlinks, &fs->s->windows) {
    if (strcmp(window, wl->window->name) == 0) {
      if (fs->wl != NULL)
        return (-1);
      fs->wl = wl;
    }
  }
  if (fs->wl != NULL) {
    fs->idx = fs->wl->idx;
    fs->w = fs->wl->window;
    return (0);
  }

  /* Stop now if exact only. */
  if (exact)
    return (-1);

  /* Try as the start of a window name, error if multiple. */
  fs->wl = NULL;
  RB_FOREACH(wl, winlinks, &fs->s->windows) {
    if (strncmp(window, wl->window->name, strlen(window)) == 0) {
      if (fs->wl != NULL)
        return (-1);
      fs->wl = wl;
    }
  }
  if (fs->wl != NULL) {
    fs->idx = fs->wl->idx;
    fs->w = fs->wl->window;
    return (0);
  }

  /* Now look for pattern matches, again error if multiple. */
  fs->wl = NULL;
  RB_FOREACH(wl, winlinks, &fs->s->windows) {
    if (fnmatch(window, wl->window->name, 0) == 0) {
      if (fs->wl != NULL)
        return (-1);
      fs->wl = wl;
    }
  }
  if (fs->wl != NULL) {
    fs->idx = fs->wl->idx;
    fs->w = fs->wl->window;
    return (0);
  }

  return (-1);
}

/* Find pane from string. Fills in s, wl, w, wp. */
static int
cmd_find_get_pane(struct cmd_find_state *fs, const char *pane, int only)
{
  log_debug("%s: %s", __func__, pane);

  /* Check for pane ids starting with %. */
  if (*pane == '%') {
    fs->wp = window_pane_find_by_id_str(pane);
    if (fs->wp == NULL)
      return (-1);
    fs->w = fs->wp->window;
    return (cmd_find_best_session_with_window(fs));
  }

  /* Not a pane id, so try the current session and window. */
  fs->s = fs->current->s;
  fs->wl = fs->current->wl;
  fs->idx = fs->current->idx;
  fs->w = fs->current->w;

  /* We now only need to find the pane in this window. */
  if (cmd_find_get_pane_with_window(fs, pane) == 0)
    return (0);

  /* Otherwise try as a window itself (this will also try as session). */
  if (!only && cmd_find_get_window(fs, pane, 0) == 0) {
    fs->wp = fs->w->active;
    return (0);
  }

  return (-1);
}

/*
 * Find pane from string, assuming it is in given session. Needs s, fills in wl
 * and w and wp.
 */
static int
cmd_find_get_pane_with_session(struct cmd_find_state *fs, const char *pane)
{
  log_debug("%s: %s", __func__, pane);

  /* Check for pane ids starting with %. */
  if (*pane == '%') {
    fs->wp = window_pane_find_by_id_str(pane);
    if (fs->wp == NULL)
      return (-1);
    fs->w = fs->wp->window;
    return (cmd_find_best_winlink_with_window(fs));
  }

  /* Otherwise use the current window. */
  fs->wl = fs->s->curw;
  fs->idx = fs->wl->idx;
  fs->w = fs->wl->window;

  /* Now we just need to look up the pane. */
  return (cmd_find_get_pane_with_window(fs, pane));
}

/*
 * Find pane from string, assuming it is in the given window. Needs w, fills in
 * wp.
 */
static int
cmd_find_get_pane_with_window(struct cmd_find_state *fs, const char *pane)
{
  const char    *errstr;
  int      idx;
  struct window_pane  *wp;
  u_int      n;

  log_debug("%s: %s", __func__, pane);

  /* Check for pane ids starting with %. */
  if (*pane == '%') {
    fs->wp = window_pane_find_by_id_str(pane);
    if (fs->wp == NULL)
      return (-1);
    if (fs->wp->window != fs->w)
      return (-1);
    return (0);
  }

  /* Try special characters. */
  if (strcmp(pane, "!") == 0) {
    fs->wp = TAILQ_FIRST(&fs->w->last_panes);
    if (fs->wp == NULL)
      return (-1);
    return (0);
  } else if (strcmp(pane, "{up-of}") == 0) {
    fs->wp = window_pane_find_up(fs->w->active);
    if (fs->wp == NULL)
      return (-1);
    return (0);
  } else if (strcmp(pane, "{down-of}") == 0) {
    fs->wp = window_pane_find_down(fs->w->active);
    if (fs->wp == NULL)
      return (-1);
    return (0);
  } else if (strcmp(pane, "{left-of}") == 0) {
    fs->wp = window_pane_find_left(fs->w->active);
    if (fs->wp == NULL)
      return (-1);
    return (0);
  } else if (strcmp(pane, "{right-of}") == 0) {
    fs->wp = window_pane_find_right(fs->w->active);
    if (fs->wp == NULL)
      return (-1);
    return (0);
  }

  /* Try as an offset. */
  if (pane[0] == '+' || pane[0] == '-') {
    if (pane[1] != '\0')
      n = strtonum(pane + 1, 1, INT_MAX, NULL);
    else
      n = 1;
    wp = fs->w->active;
    if (pane[0] == '+')
      fs->wp = window_pane_next_by_number(fs->w, wp, n);
    else
      fs->wp = window_pane_previous_by_number(fs->w, wp, n);
    if (fs->wp != NULL)
      return (0);
  }

  /* Get pane by index. */
  idx = strtonum(pane, 0, INT_MAX, &errstr);
  if (errstr == NULL) {
    fs->wp = window_pane_at_index(fs->w, idx);
    if (fs->wp != NULL)
      return (0);
  }

  /* Try as a description. */
  fs->wp = window_find_string(fs->w, pane);
  if (fs->wp != NULL)
    return (0);

  return (-1);
}

/* Clear state. */
void
cmd_find_clear_state(struct cmd_find_state *fs, int flags)
{
  memset(fs, 0, sizeof *fs);

  fs->flags = flags;

  fs->idx = -1;
}

/* Check if state is empty. */
int
cmd_find_empty_state(struct cmd_find_state *fs)
{
  if (fs->s == NULL && fs->wl == NULL && fs->w == NULL && fs->wp == NULL)
    return (1);
  return (0);
}

/* Check if a state if valid. */
int
cmd_find_valid_state(struct cmd_find_state *fs)
{
  struct winlink  *wl;

  if (fs->s == NULL || fs->wl == NULL || fs->w == NULL || fs->wp == NULL)
    return (0);

  if (!session_alive(fs->s))
    return (0);

  RB_FOREACH(wl, winlinks, &fs->s->windows) {
    if (wl->window == fs->w && wl == fs->wl)
      break;
  }
  if (wl == NULL)
    return (0);

  if (fs->w != fs->wl->window)
    return (0);

  return (window_has_pane(fs->w, fs->wp));
}

/* Copy a state. */
void
cmd_find_copy_state(struct cmd_find_state *dst, struct cmd_find_state *src)
{
  dst->s = src->s;
  dst->wl = src->wl;
  dst->idx = src->idx;
  dst->w = src->w;
  dst->wp = src->wp;
}

/* Log the result. */
static void
cmd_find_log_state(const char *prefix, struct cmd_find_state *fs)
{
  if (fs->s != NULL)
    log_debug("%s: s=$%u %s", prefix, fs->s->id, fs->s->name);
  else
    log_debug("%s: s=none", prefix);
  if (fs->wl != NULL) {
    log_debug("%s: wl=%u %d w=@%u %s", prefix, fs->wl->idx,
        fs->wl->window == fs->w, fs->w->id, fs->w->name);
  } else
    log_debug("%s: wl=none", prefix);
  if (fs->wp != NULL)
    log_debug("%s: wp=%%%u", prefix, fs->wp->id);
  else
    log_debug("%s: wp=none", prefix);
  if (fs->idx != -1)
    log_debug("%s: idx=%d", prefix, fs->idx);
  else
    log_debug("%s: idx=none", prefix);
}

/* Find state from a session. */
void
cmd_find_from_session(struct cmd_find_state *fs, struct session *s, int flags)
{
  cmd_find_clear_state(fs, flags);

  fs->s = s;
  fs->wl = fs->s->curw;
  fs->w = fs->wl->window;
  fs->wp = fs->w->active;

  cmd_find_log_state(__func__, fs);
}

/* Find state from a winlink. */
void
cmd_find_from_winlink(struct cmd_find_state *fs, struct winlink *wl, int flags)
{
  cmd_find_clear_state(fs, flags);

  fs->s = wl->session;
  fs->wl = wl;
  fs->w = wl->window;
  fs->wp = wl->window->active;

  cmd_find_log_state(__func__, fs);
}

/* Find state from a session and window. */
int
cmd_find_from_session_window(struct cmd_find_state *fs, struct session *s,
    struct window *w, int flags)
{
  cmd_find_clear_state(fs, flags);

  fs->s = s;
  fs->w = w;
  if (cmd_find_best_winlink_with_window(fs) != 0) {
    cmd_find_clear_state(fs, flags);
    return (-1);
  }
  fs->wp = fs->w->active;

  cmd_find_log_state(__func__, fs);
  return (0);
}

/* Find state from a window. */
int
cmd_find_from_window(struct cmd_find_state *fs, struct window *w, int flags)
{
  cmd_find_clear_state(fs, flags);

  fs->w = w;
  if (cmd_find_best_session_with_window(fs) != 0) {
    cmd_find_clear_state(fs, flags);
    return (-1);
  }
  if (cmd_find_best_winlink_with_window(fs) != 0) {
    cmd_find_clear_state(fs, flags);
    return (-1);
  }
  fs->wp = fs->w->active;

  cmd_find_log_state(__func__, fs);
  return (0);
}

/* Find state from a winlink and pane. */
void
cmd_find_from_winlink_pane(struct cmd_find_state *fs, struct winlink *wl,
    struct window_pane *wp, int flags)
{
  cmd_find_clear_state(fs, flags);

  fs->s = wl->session;
  fs->wl = wl;
  fs->idx = fs->wl->idx;
  fs->w = fs->wl->window;
  fs->wp = wp;

  cmd_find_log_state(__func__, fs);
}

/* Find state from a pane. */
int
cmd_find_from_pane(struct cmd_find_state *fs, struct window_pane *wp, int flags)
{
  if (cmd_find_from_window(fs, wp->window, flags) != 0)
    return (-1);
  fs->wp = wp;

  cmd_find_log_state(__func__, fs);
  return (0);
}

/* Find state from nothing. */
int
cmd_find_from_nothing(struct cmd_find_state *fs, int flags)
{
  cmd_find_clear_state(fs, flags);

  fs->s = cmd_find_best_session(NULL, 0, flags);
  if (fs->s == NULL) {
    cmd_find_clear_state(fs, flags);
    return (-1);
  }
  fs->wl = fs->s->curw;
  fs->idx = fs->wl->idx;
  fs->w = fs->wl->window;
  fs->wp = fs->w->active;

  cmd_find_log_state(__func__, fs);
  return (0);
}

/* Find state from mouse. */
int
cmd_find_from_mouse(struct cmd_find_state *fs, struct mouse_event *m, int flags)
{
  cmd_find_clear_state(fs, flags);

  if (!m->valid)
    return (-1);

  fs->wp = cmd_mouse_pane(m, &fs->s, &fs->wl);
  if (fs->wp == NULL) {
    cmd_find_clear_state(fs, flags);
    return (-1);
  }
  fs->w = fs->wl->window;

  cmd_find_log_state(__func__, fs);
  return (0);
}

/* Find state from client. */
int
cmd_find_from_client(struct cmd_find_state *fs, struct client *c, int flags)
{
  struct window_pane  *wp;

  /* If no client, treat as from nothing. */
  if (c == NULL)
    return (cmd_find_from_nothing(fs, flags));

  /* If this is an attached client, all done. */
  if (c->session != NULL) {
    cmd_find_clear_state(fs, flags);

    fs->wp = server_client_get_pane(c);
    if (fs->wp == NULL) {
      cmd_find_from_session(fs, c->session, flags);
      return (0);
    }
    fs->s = c->session;
    fs->wl = fs->s->curw;
    fs->w = fs->wl->window;

    cmd_find_log_state(__func__, fs);
    return (0);
  }
  cmd_find_clear_state(fs, flags);

  /*
   * If this is an unattached client running in a pane, we can use that
   * to limit the list of sessions to those containing that pane.
   */
  wp = cmd_find_inside_pane(c);
  if (wp == NULL)
    goto unknown_pane;

  /*
   * Don't have a session, or it doesn't have this pane. Try all
   * sessions.
   */
  fs->w = wp->window;
  if (cmd_find_best_session_with_window(fs) != 0) {
    /*
     * The window may have been destroyed but the pane
     * still on all_window_panes due to something else
     * holding a reference.
     */
    goto unknown_pane;
  }
  fs->wl = fs->s->curw;
  fs->w = fs->wl->window;
  fs->wp = fs->w->active; /* use active pane */

  cmd_find_log_state(__func__, fs);
  return (0);

unknown_pane:
  /* We can't find the pane so need to guess. */
  return (cmd_find_from_nothing(fs, flags));
}

/*
 * Split target into pieces and resolve for the given type. Fills in the given
 * state. Returns 0 on success or -1 on error.
 */
int
cmd_find_target(struct cmd_find_state *fs, struct cmdq_item *item,
    const char *target, enum cmd_find_type type, int flags)
{
  struct mouse_event  *m;
  struct cmd_find_state  current;
  char      *colon, *period, *copy = NULL, tmp[256];
  const char    *session, *window, *pane, *s;
  int      window_only = 0, pane_only = 0;

  /* Can fail flag implies quiet. */
  if (flags & CMD_FIND_CANFAIL)
    flags |= CMD_FIND_QUIET;

  /* Log the arguments. */
  if (type == CMD_FIND_PANE)
    s = "pane";
  else if (type == CMD_FIND_WINDOW)
    s = "window";
  else if (type == CMD_FIND_SESSION)
    s = "session";
  else
    s = "unknown";
  *tmp = '\0';
  if (flags & CMD_FIND_PREFER_UNATTACHED)
    strlcat(tmp, "PREFER_UNATTACHED,", sizeof tmp);
  if (flags & CMD_FIND_QUIET)
    strlcat(tmp, "QUIET,", sizeof tmp);
  if (flags & CMD_FIND_WINDOW_INDEX)
    strlcat(tmp, "WINDOW_INDEX,", sizeof tmp);
  if (flags & CMD_FIND_DEFAULT_MARKED)
    strlcat(tmp, "DEFAULT_MARKED,", sizeof tmp);
  if (flags & CMD_FIND_EXACT_SESSION)
    strlcat(tmp, "EXACT_SESSION,", sizeof tmp);
  if (flags & CMD_FIND_EXACT_WINDOW)
    strlcat(tmp, "EXACT_WINDOW,", sizeof tmp);
  if (flags & CMD_FIND_CANFAIL)
    strlcat(tmp, "CANFAIL,", sizeof tmp);
  if (*tmp != '\0')
    tmp[strlen(tmp) - 1] = '\0';
  else
    strlcat(tmp, "NONE", sizeof tmp);
  log_debug("%s: target %s, type %s, item %p, flags %s", __func__,
      target == NULL ? "none" : target, s, item, tmp);

  /* Clear new state. */
  cmd_find_clear_state(fs, flags);

  /* Find current state. */
  if (server_check_marked() && (flags & CMD_FIND_DEFAULT_MARKED)) {
    fs->current = &marked_pane;
    log_debug("%s: current is marked pane", __func__);
  } else if (cmd_find_valid_state(cmdq_get_current(item))) {
    fs->current = cmdq_get_current(item);
    log_debug("%s: current is from queue", __func__);
  } else if (cmd_find_from_client(&current, cmdq_get_client(item),
      flags) == 0) {
    fs->current = &current;
    log_debug("%s: current is from client", __func__);
  } else {
    if (~flags & CMD_FIND_QUIET)
      cmdq_error(item, "no current target");
    goto error;
  }
  if (!cmd_find_valid_state(fs->current))
    fatalx("invalid current find state");

  /* An empty or NULL target is the current. */
  if (target == NULL || *target == '\0')
    goto current;

  /* Mouse target is a plain = or {mouse}. */
  if (strcmp(target, "=") == 0 || strcmp(target, "{mouse}") == 0) {
    m = &cmdq_get_event(item)->m;
    switch (type) {
    case CMD_FIND_PANE:
      fs->wp = cmd_mouse_pane(m, &fs->s, &fs->wl);
      if (fs->wp != NULL) {
        fs->w = fs->wl->window;
        break;
      }
      /* FALLTHROUGH */
    case CMD_FIND_WINDOW:
    case CMD_FIND_SESSION:
      fs->wl = cmd_mouse_window(m, &fs->s);
      if (fs->wl == NULL && fs->s != NULL)
        fs->wl = fs->s->curw;
      if (fs->wl != NULL) {
        fs->w = fs->wl->window;
        fs->wp = fs->w->active;
      }
      break;
    }
    if (fs->wp == NULL) {
      if (~flags & CMD_FIND_QUIET)
        cmdq_error(item, "no mouse target");
      goto error;
    }
    goto found;
  }

  /* Marked target is a plain ~ or {marked}. */
  if (strcmp(target, "~") == 0 || strcmp(target, "{marked}") == 0) {
    if (!server_check_marked()) {
      if (~flags & CMD_FIND_QUIET)
        cmdq_error(item, "no marked target");
      goto error;
    }
    cmd_find_copy_state(fs, &marked_pane);
    goto found;
  }

  /* Find separators if they exist. */
  copy = xstrdup(target);
  colon = strchr(copy, ':');
  if (colon != NULL)
    *colon++ = '\0';
  if (colon == NULL)
    period = strchr(copy, '.');
  else
    period = strchr(colon, '.');
  if (period != NULL)
    *period++ = '\0';

  /* Set session, window and pane parts. */
  session = window = pane = NULL;
  if (colon != NULL && period != NULL) {
    session = copy;
    window = colon;
    window_only = 1;
    pane = period;
    pane_only = 1;
  } else if (colon != NULL && period == NULL) {
    session = copy;
    window = colon;
    window_only = 1;
  } else if (colon == NULL && period != NULL) {
    window = copy;
    pane = period;
    pane_only = 1;
  } else {
    if (*copy == '$')
      session = copy;
    else if (*copy == '@')
      window = copy;
    else if (*copy == '%')
      pane = copy;
    else {
      switch (type) {
      case CMD_FIND_SESSION:
        session = copy;
        break;
      case CMD_FIND_WINDOW:
        window = copy;
        break;
      case CMD_FIND_PANE:
        pane = copy;
        break;
      }
    }
  }

  /* Set exact match flags. */
  if (session != NULL && *session == '=') {
    session++;
    fs->flags |= CMD_FIND_EXACT_SESSION;
  }
  if (window != NULL && *window == '=') {
    window++;
    fs->flags |= CMD_FIND_EXACT_WINDOW;
  }

  /* Empty is the same as NULL. */
  if (session != NULL && *session == '\0')
    session = NULL;
  if (window != NULL && *window == '\0')
    window = NULL;
  if (pane != NULL && *pane == '\0')
    pane = NULL;

  /* Map though conversion table. */
  if (session != NULL)
    session = cmd_find_map_table(cmd_find_session_table, session);
  if (window != NULL)
    window = cmd_find_map_table(cmd_find_window_table, window);
  if (pane != NULL)
    pane = cmd_find_map_table(cmd_find_pane_table, pane);

  if (session != NULL || window != NULL || pane != NULL) {
    log_debug("%s: target %s is %s%s%s%s%s%s",
        __func__, target,
        session == NULL ? "" : "session ",
        session == NULL ? "" : session,
        window == NULL ? "" : "window ",
        window == NULL ? "" : window,
        pane == NULL ? "" : "pane ",
        pane == NULL ? "" : pane);
  }

  /* No pane is allowed if want an index. */
  if (pane != NULL && (flags & CMD_FIND_WINDOW_INDEX)) {
    if (~flags & CMD_FIND_QUIET)
      cmdq_error(item, "can't specify pane here");
    goto error;
  }

  /* If the session isn't NULL, look it up. */
  if (session != NULL) {
    /* This will fill in session. */
    if (cmd_find_get_session(fs, session) != 0)
      goto no_session;

    /* If window and pane are NULL, use that session's current. */
    if (window == NULL && pane == NULL) {
      fs->wl = fs->s->curw;
      fs->idx = -1;
      fs->w = fs->wl->window;
      fs->wp = fs->w->active;
      goto found;
    }

    /* If window is present but pane not, find window in session. */
    if (window != NULL && pane == NULL) {
      /* This will fill in winlink and window. */
      if (cmd_find_get_window_with_session(fs, window) != 0)
        goto no_window;
      if (fs->wl != NULL) /* can be NULL if index only */
        fs->wp = fs->wl->window->active;
      goto found;
    }

    /* If pane is present but window not, find pane. */
    if (window == NULL && pane != NULL) {
      /* This will fill in winlink and window and pane. */
      if (cmd_find_get_pane_with_session(fs, pane) != 0)
        goto no_pane;
      goto found;
    }

    /*
     * If window and pane are present, find both in session. This
     * will fill in winlink and window.
     */
    if (cmd_find_get_window_with_session(fs, window) != 0)
      goto no_window;
    /* This will fill in pane. */
    if (cmd_find_get_pane_with_window(fs, pane) != 0)
      goto no_pane;
    goto found;
  }

  /* No session. If window and pane, try them. */
  if (window != NULL && pane != NULL) {
    /* This will fill in session, winlink and window. */
    if (cmd_find_get_window(fs, window, window_only) != 0)
      goto no_window;
    /* This will fill in pane. */
    if (cmd_find_get_pane_with_window(fs, pane) != 0)
      goto no_pane;
    goto found;
  }

  /* If just window is present, try it. */
  if (window != NULL && pane == NULL) {
    /* This will fill in session, winlink and window. */
    if (cmd_find_get_window(fs, window, window_only) != 0)
      goto no_window;
    if (fs->wl != NULL) /* can be NULL if index only */
      fs->wp = fs->wl->window->active;
    goto found;
  }

  /* If just pane is present, try it. */
  if (window == NULL && pane != NULL) {
    /* This will fill in session, winlink, window and pane. */
    if (cmd_find_get_pane(fs, pane, pane_only) != 0)
      goto no_pane;
    goto found;
  }

current:
  /* Use the current session. */
  cmd_find_copy_state(fs, fs->current);
  if (flags & CMD_FIND_WINDOW_INDEX)
    fs->idx = -1;
  goto found;

error:
  fs->current = NULL;
  log_debug("%s: error", __func__);

  free(copy);
  if (flags & CMD_FIND_CANFAIL)
    return (0);
  return (-1);

found:
  fs->current = NULL;
  cmd_find_log_state(__func__, fs);

  free(copy);
  return (0);

no_session:
  if (~flags & CMD_FIND_QUIET)
    cmdq_error(item, "can't find session: %s", session);
  goto error;

no_window:
  if (~flags & CMD_FIND_QUIET)
    cmdq_error(item, "can't find window: %s", window);
  goto error;

no_pane:
  if (~flags & CMD_FIND_QUIET)
    cmdq_error(item, "can't find pane: %s", pane);
  goto error;
}

/* Find the current client. */
static struct client *
cmd_find_current_client(struct cmdq_item *item, int quiet)
{
  struct client   *c = NULL, *found;
  struct session    *s;
  struct window_pane  *wp;
  struct cmd_find_state  fs;

  if (item != NULL)
    c = cmdq_get_client(item);
  if (c != NULL && c->session != NULL)
    return (c);

  found = NULL;
  if (c != NULL && (wp = cmd_find_inside_pane(c)) != NULL) {
    cmd_find_clear_state(&fs, CMD_FIND_QUIET);
    fs.w = wp->window;
    if (cmd_find_best_session_with_window(&fs) == 0)
      found = cmd_find_best_client(fs.s);
  } else {
    s = cmd_find_best_session(NULL, 0, CMD_FIND_QUIET);
    if (s != NULL)
      found = cmd_find_best_client(s);
  }
  if (found == NULL && item != NULL && !quiet)
    cmdq_error(item, "no current client");
  log_debug("%s: no target, return %p", __func__, found);
  return (found);
}

/* Find the target client or report an error and return NULL. */
struct client *
cmd_find_client(struct cmdq_item *item, const char *target, int quiet)
{
  struct client *c;
  char    *copy;
  size_t     size;

  /* A NULL argument means the current client. */
  if (target == NULL)
    return (cmd_find_current_client(item, quiet));
  copy = xstrdup(target);

  /* Trim a single trailing colon if any. */
  size = strlen(copy);
  if (size != 0 && copy[size - 1] == ':')
    copy[size - 1] = '\0';

  /* Check name and path of each client. */
  TAILQ_FOREACH(c, &clients, entry) {
    if (c->session == NULL)
      continue;
    if (strcmp(copy, c->name) == 0)
      break;

    if (*c->ttyname == '\0')
      continue;
    if (strcmp(copy, c->ttyname) == 0)
      break;
    if (strncmp(c->ttyname, _PATH_DEV, (sizeof _PATH_DEV) - 1) != 0)
      continue;
    if (strcmp(copy, c->ttyname + (sizeof _PATH_DEV) - 1) == 0)
      break;
  }

  /* If no client found, report an error. */
  if (c == NULL && !quiet)
    cmdq_error(item, "can't find client: %s", copy);

  free(copy);
  log_debug("%s: target %s, return %p", __func__, target, c);
  return (c);
}

Coverage Report

Created: 2025-08-08 06:46