neovim

buffer.c (24078B)

---

// eval/buffer.c: Buffer related builtin functions

#include <stdbool.h>
#include <string.h>

#include "klib/kvec.h"
#include "nvim/ascii_defs.h"
#include "nvim/autocmd.h"
#include "nvim/autocmd_defs.h"
#include "nvim/buffer.h"
#include "nvim/buffer_defs.h"
#include "nvim/change.h"
#include "nvim/cursor.h"
#include "nvim/drawscreen.h"
#include "nvim/edit.h"
#include "nvim/eval.h"
#include "nvim/eval/buffer.h"
#include "nvim/eval/funcs.h"
#include "nvim/eval/typval.h"
#include "nvim/eval/typval_defs.h"
#include "nvim/eval/window.h"
#include "nvim/ex_cmds.h"
#include "nvim/extmark.h"
#include "nvim/globals.h"
#include "nvim/macros_defs.h"
#include "nvim/memline.h"
#include "nvim/memory.h"
#include "nvim/move.h"
#include "nvim/path.h"
#include "nvim/pos_defs.h"
#include "nvim/sign.h"
#include "nvim/strings.h"
#include "nvim/types_defs.h"
#include "nvim/undo.h"
#include "nvim/vim_defs.h"

typedef struct {
 win_T *cob_curwin_save;
 aco_save_T cob_aco;
 int cob_using_aco;
 int cob_save_VIsual_active;
} cob_T;

#include "eval/buffer.c.generated.h"

/// Find a buffer by number or exact name.
buf_T *find_buffer(typval_T *avar)
{
 buf_T *buf = NULL;

 if (avar->v_type == VAR_NUMBER) {
   buf = buflist_findnr((int)avar->vval.v_number);
 } else if (avar->v_type == VAR_STRING && avar->vval.v_string != NULL) {
   buf = buflist_findname_exp(avar->vval.v_string);
   if (buf == NULL) {
     // No full path name match, try a match with a URL or a "nofile"
     // buffer, these don't use the full path.
     FOR_ALL_BUFFERS(bp) {
       if (bp->b_fname != NULL
           && (path_with_url(bp->b_fname) || bt_nofilename(bp))
           && strcmp(bp->b_fname, avar->vval.v_string) == 0) {
         buf = bp;
         break;
       }
     }
   }
 }
 return buf;
}

/// If there is a window for "curbuf", make it the current window.
static void find_win_for_curbuf(void)
{
 // The b_wininfo list should have the windows that recently contained the
 // buffer, going over this is faster than going over all the windows.
 // Do check the buffer is still there.
 for (size_t i = 0; i < kv_size(curbuf->b_wininfo); i++) {
   WinInfo *wip = kv_A(curbuf->b_wininfo, i);
   if (wip->wi_win != NULL && wip->wi_win->w_buffer == curbuf) {
     curwin = wip->wi_win;
     break;
   }
 }
}

/// Used before making a change in "buf", which is not the current one: Make
/// "buf" the current buffer and find a window for this buffer, so that side
/// effects are done correctly (e.g., adjusting marks).
///
/// Information is saved in "cob" and MUST be restored by calling
/// change_other_buffer_restore().
static void change_other_buffer_prepare(cob_T *cob, buf_T *buf)
{
 CLEAR_POINTER(cob);

 // Set "curbuf" to the buffer being changed.  Then make sure there is a
 // window for it to handle any side effects.
 cob->cob_save_VIsual_active = VIsual_active;
 VIsual_active = false;
 cob->cob_curwin_save = curwin;
 curbuf = buf;
 find_win_for_curbuf();  // simplest: find existing window for "buf"

 if (curwin->w_buffer != buf) {
   // No existing window for this buffer.  It is dangerous to have
   // curwin->w_buffer differ from "curbuf", use the autocmd window.
   curbuf = curwin->w_buffer;
   aucmd_prepbuf(&cob->cob_aco, buf);
   cob->cob_using_aco = true;
 }
}

static void change_other_buffer_restore(cob_T *cob)
{
 if (cob->cob_using_aco) {
   aucmd_restbuf(&cob->cob_aco);
 } else {
   curwin = cob->cob_curwin_save;
   curbuf = curwin->w_buffer;
 }
 VIsual_active = cob->cob_save_VIsual_active;
}

/// Set line or list of lines in buffer "buf" to "lines".
/// Any type is allowed and converted to a string.
static void set_buffer_lines(buf_T *buf, linenr_T lnum_arg, bool append, typval_T *lines,
                            typval_T *rettv)
 FUNC_ATTR_NONNULL_ARG(4, 5)
{
 linenr_T lnum = lnum_arg + (append ? 1 : 0);
 int added = 0;

 // When using the current buffer ml_mfp will be set if needed.  Useful when
 // setline() is used on startup.  For other buffers the buffer must be
 // loaded.
 const bool is_curbuf = buf == curbuf;
 if (buf == NULL || (!is_curbuf && buf->b_ml.ml_mfp == NULL) || lnum < 1) {
   rettv->vval.v_number = 1;  // FAIL
   return;
 }

 // After this don't use "return", goto "cleanup"!
 cob_T cob;
 if (!is_curbuf) {
   // set "curbuf" to "buf" and find a window for this buffer
   change_other_buffer_prepare(&cob, buf);
 }

 linenr_T append_lnum;
 if (append) {
   // appendbufline() uses the line number below which we insert
   append_lnum = lnum - 1;
 } else {
   // setbufline() uses the line number above which we insert, we only
   // append if it's below the last line
   append_lnum = curbuf->b_ml.ml_line_count;
 }

 list_T *l = NULL;
 listitem_T *li = NULL;
 char *line = NULL;
 if (lines->v_type == VAR_LIST) {
   l = lines->vval.v_list;
   if (l == NULL || tv_list_len(l) == 0) {
     // not appending anything always succeeds
     goto cleanup;
   }
   li = tv_list_first(l);
 } else {
   line = typval_tostring(lines, false);
 }

 // Default result is zero == OK.
 while (true) {
   if (lines->v_type == VAR_LIST) {
     // List argument, get next string.
     if (li == NULL) {
       break;
     }
     xfree(line);
     line = typval_tostring(TV_LIST_ITEM_TV(li), false);
     li = TV_LIST_ITEM_NEXT(l, li);
   }

   rettv->vval.v_number = 1;  // FAIL
   if (line == NULL || lnum > curbuf->b_ml.ml_line_count + 1) {
     break;
   }

   // When coming here from Insert mode, sync undo, so that this can be
   // undone separately from what was previously inserted.
   if (u_sync_once == 2) {
     u_sync_once = 1;  // notify that u_sync() was called
     u_sync(true);
   }

   if (!append && lnum <= curbuf->b_ml.ml_line_count) {
     // Existing line, replace it.
     int old_len = (int)strlen(ml_get(lnum));
     if (u_savesub(lnum) == OK
         && ml_replace(lnum, line, true) == OK) {
       inserted_bytes(lnum, 0, old_len, (int)strlen(line));
       if (is_curbuf && lnum == curwin->w_cursor.lnum) {
         check_cursor_col(curwin);
       }
       rettv->vval.v_number = 0;  // OK
     }
   } else if (added > 0 || u_save(lnum - 1, lnum) == OK) {
     // append the line.
     added++;
     if (ml_append(lnum - 1, line, 0, false) == OK) {
       rettv->vval.v_number = 0;  // OK
     }
   }

   if (l == NULL) {  // only one string argument
     break;
   }
   lnum++;
 }
 xfree(line);

 if (added > 0) {
   appended_lines_mark(append_lnum, added);

   // Only adjust the cursor for buffers other than the current, unless it
   // is the current window. For curbuf and other windows it has been done
   // in mark_adjust_internal().
   FOR_ALL_TAB_WINDOWS(tp, wp) {
     if (wp->w_buffer == buf
         && (wp->w_buffer != curbuf || wp == curwin)
         && wp->w_cursor.lnum > append_lnum) {
       wp->w_cursor.lnum += (linenr_T)added;
     }
   }
   check_cursor_col(curwin);
   update_topline(curwin);
 }

cleanup:
 if (!is_curbuf) {
   change_other_buffer_restore(&cob);
 }
}

/// "append(lnum, string/list)" function
void f_append(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 const int did_emsg_before = did_emsg;
 const linenr_T lnum = tv_get_lnum(&argvars[0]);
 if (did_emsg == did_emsg_before) {
   set_buffer_lines(curbuf, lnum, true, &argvars[1], rettv);
 }
}

/// Set or append lines to a buffer.
static void buf_set_append_line(typval_T *argvars, typval_T *rettv, bool append)
{
 const int did_emsg_before = did_emsg;
 buf_T *const buf = tv_get_buf(&argvars[0], false);
 if (buf == NULL) {
   rettv->vval.v_number = 1;  // FAIL
 } else {
   const linenr_T lnum = tv_get_lnum_buf(&argvars[1], buf);
   if (did_emsg == did_emsg_before) {
     set_buffer_lines(buf, lnum, append, &argvars[2], rettv);
   }
 }
}

/// "appendbufline(buf, lnum, string/list)" function
void f_appendbufline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_set_append_line(argvars, rettv, true);
}

/// "bufadd(expr)" function
void f_bufadd(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 char *name = (char *)tv_get_string(&argvars[0]);

 rettv->vval.v_number = buflist_add(*name == NUL ? NULL : name, 0);
}

/// "bufexists(expr)" function
void f_bufexists(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 rettv->vval.v_number = (find_buffer(&argvars[0]) != NULL);
}

/// "buflisted(expr)" function
void f_buflisted(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_T *buf;

 buf = find_buffer(&argvars[0]);
 rettv->vval.v_number = (buf != NULL && buf->b_p_bl);
}

/// "bufload(expr)" function
void f_bufload(typval_T *argvars, typval_T *unused, EvalFuncData fptr)
{
 buf_T *buf = get_buf_arg(&argvars[0]);

 if (buf != NULL) {
   if (swap_exists_action != SEA_READONLY) {
     swap_exists_action = SEA_NONE;
   }
   buf_ensure_loaded(buf);
 }
}

/// "bufloaded(expr)" function
void f_bufloaded(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_T *buf;

 buf = find_buffer(&argvars[0]);
 rettv->vval.v_number = (buf != NULL && buf->b_ml.ml_mfp != NULL);
}

/// "bufname(expr)" function
void f_bufname(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 const buf_T *buf;
 rettv->v_type = VAR_STRING;
 rettv->vval.v_string = NULL;
 if (argvars[0].v_type == VAR_UNKNOWN) {
   buf = curbuf;
 } else {
   buf = tv_get_buf_from_arg(&argvars[0]);
 }
 if (buf != NULL && buf->b_fname != NULL) {
   rettv->vval.v_string = xstrdup(buf->b_fname);
 }
}

/// "bufnr(expr)" function
void f_bufnr(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 const buf_T *buf;
 bool error = false;

 rettv->vval.v_number = -1;

 if (argvars[0].v_type == VAR_UNKNOWN) {
   buf = curbuf;
 } else {
   // Don't use tv_get_buf_from_arg(); we continue if the buffer wasn't found
   // and the second argument isn't zero, but we want to return early if the
   // first argument isn't a string or number so only one error is shown.
   if (!tv_check_str_or_nr(&argvars[0])) {
     return;
   }
   emsg_off++;
   buf = tv_get_buf(&argvars[0], false);
   emsg_off--;
 }

 // If the buffer isn't found and the second argument is not zero create a
 // new buffer.
 const char *name;
 if (buf == NULL
     && argvars[1].v_type != VAR_UNKNOWN
     && tv_get_number_chk(&argvars[1], &error) != 0
     && !error
     && (name = tv_get_string_chk(&argvars[0])) != NULL) {
   buf = buflist_new((char *)name, NULL, 1, 0);
 }

 if (buf != NULL) {
   rettv->vval.v_number = buf->b_fnum;
 }
}

static void buf_win_common(typval_T *argvars, typval_T *rettv, bool get_nr)
{
 const buf_T *const buf = tv_get_buf_from_arg(&argvars[0]);
 if (buf == NULL) {  // no need to search if invalid arg or buffer not found
   rettv->vval.v_number = -1;
   return;
 }

 int winnr = 0;
 int winid;
 bool found_buf = false;
 FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
   winnr += win_has_winnr(wp, curtab);
   if (wp->w_buffer == buf && (!get_nr || win_has_winnr(wp, curtab))) {
     found_buf = true;
     winid = wp->handle;
     break;
   }
 }
 rettv->vval.v_number = (found_buf ? (get_nr ? winnr : winid) : -1);
}

/// "bufwinid(nr)" function
void f_bufwinid(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_win_common(argvars, rettv, false);
}

/// "bufwinnr(nr)" function
void f_bufwinnr(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_win_common(argvars, rettv, true);
}

/// "deletebufline()" function
void f_deletebufline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 const int did_emsg_before = did_emsg;
 rettv->vval.v_number = 1;   // FAIL by default
 buf_T *const buf = tv_get_buf(&argvars[0], false);
 if (buf == NULL) {
   return;
 }

 linenr_T last;
 const linenr_T first = tv_get_lnum_buf(&argvars[1], buf);
 if (did_emsg > did_emsg_before) {
   return;
 }
 if (argvars[2].v_type != VAR_UNKNOWN) {
   last = tv_get_lnum_buf(&argvars[2], buf);
 } else {
   last = first;
 }

 if (buf->b_ml.ml_mfp == NULL || first < 1
     || first > buf->b_ml.ml_line_count || last < first) {
   return;
 }

 // After this don't use "return", goto "cleanup"!
 const bool is_curbuf = buf == curbuf;
 cob_T cob;
 if (!is_curbuf) {
   // set "curbuf" to "buf" and find a window for this buffer
   change_other_buffer_prepare(&cob, buf);
 }

 if (last > curbuf->b_ml.ml_line_count) {
   last = curbuf->b_ml.ml_line_count;
 }
 const int count = last - first + 1;

 // When coming here from Insert mode, sync undo, so that this can be
 // undone separately from what was previously inserted.
 if (u_sync_once == 2) {
   u_sync_once = 1;  // notify that u_sync() was called
   u_sync(true);
 }

 if (u_save(first - 1, last + 1) == FAIL) {
   goto cleanup;
 }

 for (linenr_T lnum = first; lnum <= last; lnum++) {
   ml_delete_flags(first, ML_DEL_MESSAGE);
 }

 FOR_ALL_TAB_WINDOWS(tp, wp) {
   if (wp->w_buffer == buf) {
     if (wp->w_cursor.lnum > last) {
       wp->w_cursor.lnum -= (linenr_T)count;
     } else if (wp->w_cursor.lnum > first) {
       wp->w_cursor.lnum = first;
     }
     if (wp->w_cursor.lnum > wp->w_buffer->b_ml.ml_line_count) {
       wp->w_cursor.lnum = wp->w_buffer->b_ml.ml_line_count;
     }
   }
 }
 check_cursor_col(curwin);
 deleted_lines_mark(first, count);
 rettv->vval.v_number = 0;  // OK

cleanup:
 if (!is_curbuf) {
   change_other_buffer_restore(&cob);
 }
}

/// @return  buffer options, variables and other attributes in a dictionary.
static dict_T *get_buffer_info(buf_T *buf)
{
 dict_T *const dict = tv_dict_alloc();

 tv_dict_add_nr(dict, S_LEN("bufnr"), buf->b_fnum);
 tv_dict_add_str(dict, S_LEN("name"), buf->b_ffname != NULL ? buf->b_ffname : "");
 tv_dict_add_nr(dict, S_LEN("lnum"),
                buf == curbuf ? curwin->w_cursor.lnum : buflist_findlnum(buf));
 tv_dict_add_nr(dict, S_LEN("linecount"), buf->b_ml.ml_line_count);
 tv_dict_add_nr(dict, S_LEN("loaded"), buf->b_ml.ml_mfp != NULL);
 tv_dict_add_nr(dict, S_LEN("listed"), buf->b_p_bl);
 tv_dict_add_nr(dict, S_LEN("changed"), bufIsChanged(buf));
 tv_dict_add_nr(dict, S_LEN("changedtick"), buf_get_changedtick(buf));
 tv_dict_add_nr(dict, S_LEN("hidden"), buf->b_ml.ml_mfp != NULL && buf->b_nwindows == 0);
 tv_dict_add_nr(dict, S_LEN("command"), buf == cmdwin_buf);

 // Get a reference to buffer variables
 tv_dict_add_dict(dict, S_LEN("variables"), buf->b_vars);

 // List of windows displaying this buffer
 list_T *const windows = tv_list_alloc(kListLenMayKnow);
 FOR_ALL_TAB_WINDOWS(tp, wp) {
   if (wp->w_buffer == buf) {
     tv_list_append_number(windows, (varnumber_T)wp->handle);
   }
 }
 tv_dict_add_list(dict, S_LEN("windows"), windows);

 if (buf_has_signs(buf)) {
   // List of signs placed in this buffer
   tv_dict_add_list(dict, S_LEN("signs"), get_buffer_signs(buf));
 }

 tv_dict_add_nr(dict, S_LEN("lastused"), buf->b_last_used);

 return dict;
}

/// "getbufinfo()" function
void f_getbufinfo(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_T *argbuf = NULL;
 bool filtered = false;
 bool sel_buflisted = false;
 bool sel_bufloaded = false;
 bool sel_bufmodified = false;

 tv_list_alloc_ret(rettv, kListLenMayKnow);

 // List of all the buffers or selected buffers
 if (argvars[0].v_type == VAR_DICT) {
   dict_T *sel_d = argvars[0].vval.v_dict;

   if (sel_d != NULL) {
     dictitem_T *di;

     filtered = true;

     di = tv_dict_find(sel_d, S_LEN("buflisted"));
     if (di != NULL && tv_get_number(&di->di_tv)) {
       sel_buflisted = true;
     }

     di = tv_dict_find(sel_d, S_LEN("bufloaded"));
     if (di != NULL && tv_get_number(&di->di_tv)) {
       sel_bufloaded = true;
     }
     di = tv_dict_find(sel_d, S_LEN("bufmodified"));
     if (di != NULL && tv_get_number(&di->di_tv)) {
       sel_bufmodified = true;
     }
   }
 } else if (argvars[0].v_type != VAR_UNKNOWN) {
   // Information about one buffer.  Argument specifies the buffer
   argbuf = tv_get_buf_from_arg(&argvars[0]);
   if (argbuf == NULL) {
     return;
   }
 }

 // Return information about all the buffers or a specified buffer
 FOR_ALL_BUFFERS(buf) {
   if (argbuf != NULL && argbuf != buf) {
     continue;
   }
   if (filtered && ((sel_bufloaded && buf->b_ml.ml_mfp == NULL)
                    || (sel_buflisted && !buf->b_p_bl)
                    || (sel_bufmodified && !buf->b_changed))) {
     continue;
   }

   dict_T *const d = get_buffer_info(buf);
   tv_list_append_dict(rettv->vval.v_list, d);
   if (argbuf != NULL) {
     return;
   }
 }
}

/// Get line or list of lines from buffer "buf" into "rettv".
///
/// @param retlist  if true, then the lines are returned as a Vim List.
///
/// @return  range (from start to end) of lines in rettv from the specified
///          buffer.
static void get_buffer_lines(buf_T *buf, linenr_T start, linenr_T end, bool retlist,
                            typval_T *rettv)
{
 rettv->v_type = (retlist ? VAR_LIST : VAR_STRING);
 rettv->vval.v_string = NULL;

 if (buf == NULL || buf->b_ml.ml_mfp == NULL || start < 0 || end < start) {
   if (retlist) {
     tv_list_alloc_ret(rettv, 0);
   }
   return;
 }

 if (retlist) {
   if (start < 1) {
     start = 1;
   }
   if (end > buf->b_ml.ml_line_count) {
     end = buf->b_ml.ml_line_count;
   }
   tv_list_alloc_ret(rettv, end - start + 1);
   while (start <= end) {
     tv_list_append_string(rettv->vval.v_list,
                           ml_get_buf(buf, start), (int)ml_get_buf_len(buf, start));
     start++;
   }
 } else {
   rettv->v_type = VAR_STRING;
   rettv->vval.v_string =
     start >= 1 && start <= buf->b_ml.ml_line_count
     ? xstrnsave(ml_get_buf(buf, start), (size_t)ml_get_buf_len(buf, start))
     : NULL;
 }
}

/// @param retlist  true: "getbufline()" function
///                 false: "getbufoneline()" function
static void getbufline(typval_T *argvars, typval_T *rettv, bool retlist)
{
 const int did_emsg_before = did_emsg;
 buf_T *const buf = tv_get_buf_from_arg(&argvars[0]);
 const linenr_T lnum = tv_get_lnum_buf(&argvars[1], buf);
 if (did_emsg > did_emsg_before) {
   return;
 }
 const linenr_T end = (argvars[2].v_type == VAR_UNKNOWN
                       ? lnum
                       : tv_get_lnum_buf(&argvars[2], buf));

 get_buffer_lines(buf, lnum, end, retlist, rettv);
}

/// "getbufline()" function
void f_getbufline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 getbufline(argvars, rettv, true);
}

/// "getbufoneline()" function
void f_getbufoneline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 getbufline(argvars, rettv, false);
}

/// "getline(lnum, [end])" function
void f_getline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 linenr_T end;
 bool retlist;

 const linenr_T lnum = tv_get_lnum(argvars);
 if (argvars[1].v_type == VAR_UNKNOWN) {
   end = lnum;
   retlist = false;
 } else {
   end = tv_get_lnum(&argvars[1]);
   retlist = true;
 }

 get_buffer_lines(curbuf, lnum, end, retlist, rettv);
}

/// "setbufline()" function
void f_setbufline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 buf_set_append_line(argvars, rettv, false);
}

/// "setline()" function
void f_setline(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 const int did_emsg_before = did_emsg;
 linenr_T lnum = tv_get_lnum(&argvars[0]);
 if (did_emsg == did_emsg_before) {
   set_buffer_lines(curbuf, lnum, false, &argvars[1], rettv);
 }
}

/// Make "buf" the current buffer.
///
/// restore_buffer() MUST be called to undo.
/// No autocommands will be executed. Use aucmd_prepbuf() if there are any.
void switch_buffer(bufref_T *save_curbuf, buf_T *buf)
{
 block_autocmds();
 set_bufref(save_curbuf, curbuf);
 curbuf->b_nwindows--;
 curbuf = buf;
 curwin->w_buffer = buf;
 curbuf->b_nwindows++;
}

/// Restore the current buffer after using switch_buffer().
void restore_buffer(bufref_T *save_curbuf)
{
 unblock_autocmds();
 // Check for valid buffer, just in case.
 if (bufref_valid(save_curbuf)) {
   curbuf->b_nwindows--;
   curwin->w_buffer = save_curbuf->br_buf;
   curbuf = save_curbuf->br_buf;
   curbuf->b_nwindows++;
 }
}

/// "prompt_setcallback({buffer}, {callback})" function
void f_prompt_setcallback(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 Callback prompt_callback = CALLBACK_INIT;

 if (check_secure()) {
   return;
 }
 buf_T *buf = tv_get_buf(&argvars[0], false);
 if (buf == NULL) {
   return;
 }

 if (argvars[1].v_type != VAR_STRING || *argvars[1].vval.v_string != NUL) {
   if (!callback_from_typval(&prompt_callback, &argvars[1])) {
     return;
   }
 }

 callback_free(&buf->b_prompt_callback);
 buf->b_prompt_callback = prompt_callback;
}

/// "prompt_setinterrupt({buffer}, {callback})" function
void f_prompt_setinterrupt(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 Callback interrupt_callback = CALLBACK_INIT;

 if (check_secure()) {
   return;
 }
 buf_T *buf = tv_get_buf(&argvars[0], false);
 if (buf == NULL) {
   return;
 }

 if (argvars[1].v_type != VAR_STRING || *argvars[1].vval.v_string != NUL) {
   if (!callback_from_typval(&interrupt_callback, &argvars[1])) {
     return;
   }
 }

 callback_free(&buf->b_prompt_interrupt);
 buf->b_prompt_interrupt = interrupt_callback;
}

/// "prompt_setprompt({buffer}, {text})" function
void f_prompt_setprompt(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
{
 if (check_secure()) {
   return;
 }
 buf_T *buf = tv_get_buf(&argvars[0], false);
 if (buf == NULL) {
   return;
 }

 const char *new_prompt = tv_get_string(&argvars[1]);
 int new_prompt_len = (int)strlen(new_prompt);

 // Update the prompt-text and prompt-marks if a plugin calls prompt_setprompt()
 // even while user is editing their input.
 if (bt_prompt(buf) && buf->b_ml.ml_mfp != NULL) {
   // In case the mark is set to a nonexistent line.
   buf->b_prompt_start.mark.lnum = MAX(1, MIN(buf->b_prompt_start.mark.lnum,
                                              buf->b_ml.ml_line_count));

   linenr_T prompt_lno = buf->b_prompt_start.mark.lnum;
   char *old_prompt = buf_prompt_text(buf);
   char *old_line = ml_get_buf(buf, prompt_lno);
   colnr_T old_line_len = ml_get_buf_len(buf, prompt_lno);

   int old_prompt_len = (int)strlen(old_prompt);
   colnr_T cursor_col = curwin->w_cursor.col;

   if (buf->b_prompt_start.mark.col < old_prompt_len
       || buf->b_prompt_start.mark.col > old_line_len
       || !strnequal(old_prompt, old_line + buf->b_prompt_start.mark.col - old_prompt_len,
                     (size_t)old_prompt_len)) {
     // If for some odd reason the old prompt is missing,
     // replace prompt line with new-prompt (discards user-input).
     ml_replace_buf(buf, prompt_lno, (char *)new_prompt, true, false);
     extmark_splice_cols(buf, prompt_lno - 1, 0, old_line_len, new_prompt_len, kExtmarkNoUndo);
     cursor_col = new_prompt_len;
   } else {
     // Replace prev-prompt + user-input with new-prompt + user-input
     char *new_line = concat_str(new_prompt, old_line + buf->b_prompt_start.mark.col);
     if (ml_replace_buf(buf, prompt_lno, new_line, false, false) != OK) {
       xfree(new_line);
     }
     extmark_splice_cols(buf, prompt_lno - 1, 0, buf->b_prompt_start.mark.col, new_prompt_len,
                         kExtmarkNoUndo);
     cursor_col += new_prompt_len - buf->b_prompt_start.mark.col;
   }

   if (curwin->w_buffer == buf && curwin->w_cursor.lnum == prompt_lno) {
     curwin->w_cursor.col = cursor_col;
     check_cursor_col(curwin);
   }
   changed_lines(buf, prompt_lno, 0, prompt_lno + 1, 0, true);
   // Undo history contains the old prompt.
   u_clearallandblockfree(buf);
 }

 // Clear old prompt text and replace with the new one
 xfree(buf->b_prompt_text);
 buf->b_prompt_text = xstrdup(new_prompt);
 buf->b_prompt_start.mark.col = (colnr_T)new_prompt_len;
}