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Diffstat (limited to 'src/buffer.c')
| -rw-r--r-- | src/buffer.c | 1359 |
1 files changed, 1359 insertions, 0 deletions
diff --git a/src/buffer.c b/src/buffer.c new file mode 100644 index 00000000000..672dc1f56e2 --- /dev/null +++ b/src/buffer.c @@ -0,0 +1,1359 @@ +/* Buffer manipulation primitives for GNU Emacs. + Copyright (C) 1985, 1986, 1987, 1988, 1990 Free Software Foundation, Inc. + +This file is part of GNU Emacs. + +GNU Emacs is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 1, or (at your option) +any later version. + +GNU Emacs is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Emacs; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + + +#include <sys/param.h> + +#ifndef MAXPATHLEN +/* in 4.1, param.h fails to define this. */ +#define MAXPATHLEN 1024 +#endif /* not MAXPATHLEN */ + +#ifdef NULL +#undef NULL +#endif +#include "config.h" +#include "lisp.h" +#include "window.h" +#include "commands.h" +#include "buffer.h" +#include "syntax.h" + +struct buffer *current_buffer; /* the current buffer */ + +/* First buffer in chain of all buffers (in reverse order of creation). + Threaded through ->next. */ + +struct buffer *all_buffers; + +/* This structure holds the default values of the buffer-local variables + defined with DEFVAR_PER_BUFFER, that have special slots in each buffer. + The default value occupies the same slot in this structure + as an individual buffer's value occupies in that buffer. + Setting the default value also goes through the alist of buffers + and stores into each buffer that does not say it has a local value. */ + +struct buffer buffer_defaults; +/* A Lisp_Object pointer to the above, used for staticpro */ +static Lisp_Object Vbuffer_defaults; + +/* This structure marks which slots in a buffer have corresponding + default values in buffer_defaults. + Each such slot has a nonzero value in this structure. + The value has only one nonzero bit. + + When a buffer has its own local value for a slot, + the bit for that slot (found in the same slot in this structure) + is turned on in the buffer's local_var_flags slot. + + If a slot in this structure is -1, then even though there may + be a DEFVAR_PER_BUFFER for the slot, there is no default value for it; + and the corresponding slot in buffer_defaults is not used. + + If a slot is -2, then there is no DEFVAR_PER_BUFFER for it, + but there is a default value which is copied into each buffer. + + If a slot in this structure corresponding to a DEFVAR_PER_BUFFER is + zero, that is a bug */ + +struct buffer buffer_local_flags; + +/* This structure holds the names of symbols whose values may be + buffer-local. It is indexed and accessed in the same way as the above. */ + +struct buffer buffer_local_symbols; +/* A Lisp_Object pointer to the above, used for staticpro */ +static Lisp_Object Vbuffer_local_symbols; + +Lisp_Object Fset_buffer (); + +/* Alist of all buffer names vs the buffers. */ +/* This used to be a variable, but is no longer, + to prevent lossage due to user rplac'ing this alist or its elements. */ +Lisp_Object Vbuffer_alist; + +Lisp_Object Qfundamental_mode, Qmode_class; + +Lisp_Object QSFundamental; /* A string "Fundamental" */ + +/* For debugging; temporary. See set_buffer_internal. */ +/* Lisp_Object Qlisp_mode, Vcheck_symbol; */ + +nsberror (spec) + Lisp_Object spec; +{ + if (XTYPE (spec) == Lisp_String) + error ("No buffer named %s", XSTRING (spec)->data); + error ("Invalid buffer argument"); +} + +DEFUN ("buffer-list", Fbuffer_list, Sbuffer_list, 0, 0, 0, + "Return a list of all buffers.") + () +{ + return Fmapcar (Qcdr, Vbuffer_alist); +} + +DEFUN ("get-buffer", Fget_buffer, Sget_buffer, 1, 1, 0, + "Return the buffer named NAME (a string).\n\ +It is found by looking up NAME in buffer-alist.\n\ +If there is no buffer named NAME, nil is returned.\n\ +NAME may also be a buffer; it is returned.") + (name) + register Lisp_Object name; +{ + if (XTYPE (name) == Lisp_Buffer) + return name; + CHECK_STRING (name, 0); + + return Fcdr (Fassoc (name, Vbuffer_alist)); +} + +DEFUN ("get-file-buffer", Fget_file_buffer, Sget_file_buffer, 1, 1, 0, + "Return the buffer visiting file FILENAME (a string).\n\ +If there is no such buffer, nil is returned.") + (filename) + register Lisp_Object filename; +{ + register Lisp_Object tail, buf, tem; + CHECK_STRING (filename, 0); + filename = Fexpand_file_name (filename, Qnil); + + for (tail = Vbuffer_alist; CONSP (tail); tail = XCONS (tail)->cdr) + { + buf = Fcdr (XCONS (tail)->car); + if (XTYPE (buf) != Lisp_Buffer) continue; + if (XTYPE (XBUFFER (buf)->filename) != Lisp_String) continue; + tem = Fstring_equal (XBUFFER (buf)->filename, filename); + if (!NULL (tem)) + return buf; + } + return Qnil; +} + +DEFUN ("get-buffer-create", Fget_buffer_create, Sget_buffer_create, 1, 1, 0, + "Like get-buffer but creates a buffer named NAME and returns it if none already exists.") + (name) + register Lisp_Object name; +{ + register Lisp_Object buf, function, tem; + int count = specpdl_ptr - specpdl; + register struct buffer *b; + register unsigned char *data; + /* register struct buffer *bx; */ + + buf = Fget_buffer (name); + if (!NULL (buf)) return buf; + + b = (struct buffer *) malloc (sizeof (struct buffer)); + if (!b) memory_full (); + + BUF_GAP_SIZE (b) = 20; + data = (unsigned char *) malloc (BUF_GAP_SIZE (b)); + if (!data) + { + free (b); + memory_full (); + } + BUF_BEG_ADDR (b) = data; + BUF_PT (b) = 1; + BUF_GPT (b) = 1; + BUF_BEGV (b) = 1; + BUF_ZV (b) = 1; + BUF_Z (b) = 1; + BUF_MODIFF (b) = 1; + + /* Put this on the chain of all buffers including killed ones. */ + b->next = all_buffers; + all_buffers = b; + + /* Put this in the alist of all live buffers. */ + XSET (buf, Lisp_Buffer, b); +#if 0 + XSETTYPE (buf, Lisp_Buffer); + bx = b; /* Use of bx avoids compiler bug on Sun */ + XSETBUFFER (buf, bx); +#endif + Vbuffer_alist = nconc2 (Vbuffer_alist, Fcons (Fcons (name, buf), Qnil)); + + b->mark = Fmake_marker (); + b->markers = Qnil; + b->name = name; + + /* Enable undo in this buffer unless name starts with a space. */ + if (XSTRING (name)->data[0] != ' ') + b->undo_list = Qnil; + else + b->undo_list = Qt; + + reset_buffer (b); + + function = buffer_defaults.major_mode; + if (NULL (function)) + { + tem = Fget (current_buffer->major_mode, Qmode_class); + if (EQ (tem, Qnil)) + function = current_buffer->major_mode; + } + + if (NULL (function) || EQ (function, Qfundamental_mode)) + return buf; + + /* To select a nonfundamental mode, + select the buffer temporarily and then call the mode function. */ + + record_unwind_protect (save_excursion_restore, save_excursion_save ()); + + Fset_buffer (buf); + call0 (function); + + unbind_to (count); + return buf; +} + +/* Reinitialize everything about a buffer except its name and contents. */ + +void +reset_buffer (b) + register struct buffer *b; +{ + b->filename = Qnil; + b->directory = (current_buffer) ? current_buffer->directory : Qnil; + b->modtime = 0; + b->save_modified = 1; + b->save_length = 0; + b->last_window_start = 1; + b->backed_up = Qnil; + b->auto_save_modified = 0; + b->auto_save_file_name = Qnil; + b->read_only = Qnil; + reset_buffer_local_variables(b); +} + +reset_buffer_local_variables(b) + register struct buffer *b; +{ + register int offset; + + /* Reset the major mode to Fundamental, together with all the + things that depend on the major mode. + default-major-mode is handled at a higher level. + We ignore it here. */ + b->major_mode = Qfundamental_mode; + b->keymap = Qnil; + b->abbrev_table = Vfundamental_mode_abbrev_table; + b->mode_name = QSFundamental; + + /* Reset all per-buffer variables to their defaults. */ + b->local_var_alist = Qnil; + b->local_var_flags = 0; + + /* For each slot that has a default value, + copy that into the slot. */ + + for (offset = (char *)&buffer_local_flags.name - (char *)&buffer_local_flags; + offset < sizeof (struct buffer); + offset += sizeof (Lisp_Object)) /* sizeof int == sizeof Lisp_Object */ + if (*(int *)(offset + (char *) &buffer_local_flags) > 0 + || *(int *)(offset + (char *) &buffer_local_flags) == -2) + *(Lisp_Object *)(offset + (char *)b) = + *(Lisp_Object *)(offset + (char *)&buffer_defaults); +} + +DEFUN ("generate-new-buffer", Fgenerate_new_buffer, Sgenerate_new_buffer, + 1, 1, 0, + "Creates and returns a buffer named NAME if one does not already exist,\n\ +else tries adding successive suffixes to NAME until a new buffer-name is\n\ +formed, then creates and returns a new buffer with that new name.") + (name) + register Lisp_Object name; +{ + register Lisp_Object gentemp, tem; + int count; + char number[10]; + + CHECK_STRING (name, 0); + + tem = Fget_buffer (name); + if (NULL (tem)) + return Fget_buffer_create (name); + + count = 1; + while (1) + { + sprintf (number, "<%d>", ++count); + gentemp = concat2 (name, build_string (number)); + tem = Fget_buffer (gentemp); + if (NULL (tem)) + return Fget_buffer_create (gentemp); + } +} + + +DEFUN ("buffer-name", Fbuffer_name, Sbuffer_name, 0, 1, 0, + "Return the name of BUFFER, as a string.\n\ +No arg means return name of current buffer.") + (buffer) + register Lisp_Object buffer; +{ + if (NULL (buffer)) + return current_buffer->name; + CHECK_BUFFER (buffer, 0); + return XBUFFER (buffer)->name; +} + +#ifdef NOTDEF /* Useless. If you need this, you should be using `eq' + DEFUN ("buffer-number", Fbuffer_number, Sbuffer_number, 0, 1, 0, + "Return the number of BUFFER.\n\ + No arg means return number of current buffer.") + (buffer) + Lisp_Object buffer; + { + if (NULL (buffer)) + return current_buffer->number; + CHECK_BUFFER (buffer, 0); + return XBUFFER (buffer)->number; + } + */ +#endif NOTDEF + +DEFUN ("buffer-file-name", Fbuffer_file_name, Sbuffer_file_name, 0, 1, 0, + "Return name of file BUFFER is visiting, or NIL if none.\n\ +No argument means use current buffer as BUFFER.") + (buffer) + register Lisp_Object buffer; +{ + if (NULL (buffer)) + return current_buffer->filename; + CHECK_BUFFER (buffer, 0); + return XBUFFER (buffer)->filename; +} + +DEFUN ("buffer-local-variables", Fbuffer_local_variables, + Sbuffer_local_variables, 0, 1, 0, + "Return alist of variables that are buffer-local in BUFFER.\n\ +No argument means use current buffer as BUFFER.\n\ +Each element of the value looks like (SYMBOL . VALUE).\n\ +Note that storing new VALUEs in these elements\n\ +does not change the local values.") + (buffer) + register Lisp_Object buffer; +{ + register struct buffer *buf; + register Lisp_Object val; + + if (NULL (buffer)) + buf = current_buffer; + else + { + CHECK_BUFFER (buffer, 0); + buf = XBUFFER (buffer); + } + + { + /* Reference each variable in the alist in our current buffer. + If inquiring about the current buffer, this gets the current values, + so store them into the alist so the alist is up to date. + If inquiring about some other buffer, this swaps out any values + for that buffer, making the alist up to date automatically. */ + register Lisp_Object tem; + for (tem = buf->local_var_alist; CONSP (tem); tem = XCONS (tem)->cdr) + { + Lisp_Object v1 = Fsymbol_value (XCONS (XCONS (tem)->car)->car); + if (buf == current_buffer) + XCONS (XCONS (tem)->car)->cdr = v1; + } + } + + /* Make a copy of the alist, to return it. */ + val = Fcopy_alist (buf->local_var_alist); + + /* Add on all the variables stored in special slots. */ + { + register int offset, mask; + + for (offset = (char *)&buffer_local_symbols.name - (char *)&buffer_local_symbols; + offset < sizeof (struct buffer); + offset += (sizeof (int))) /* sizeof int == sizeof Lisp_Object */ + { + mask = *(int *)(offset + (char *) &buffer_local_flags); + if (mask == -1 || (buf->local_var_flags & mask)) + if (XTYPE (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols)) + == Lisp_Symbol) + val = Fcons (Fcons (*(Lisp_Object *)(offset + (char *)&buffer_local_symbols), + *(Lisp_Object *)(offset + (char *)buf)), + val); + } + } + return (val); +} + + +DEFUN ("buffer-modified-p", Fbuffer_modified_p, Sbuffer_modified_p, + 0, 1, 0, + "Return t if BUFFER is modified since file last read in or saved.\n\ +No argument means use current buffer as BUFFER.") + (buffer) + register Lisp_Object buffer; +{ + register struct buffer *buf; + if (NULL (buffer)) + buf = current_buffer; + else + { + CHECK_BUFFER (buffer, 0); + buf = XBUFFER (buffer); + } + + return buf->save_modified < BUF_MODIFF (buf) ? Qt : Qnil; +} + +DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p, + 1, 1, 0, + "Mark current buffer as modified or unmodified according to FLAG.") + (flag) + register Lisp_Object flag; +{ + register int already; + register Lisp_Object fn; + +#ifdef CLASH_DETECTION + /* If buffer becoming modified, lock the file. + If buffer becoming unmodified, unlock the file. */ + + fn = current_buffer->filename; + if (!NULL (fn)) + { + already = current_buffer->save_modified < MODIFF; + if (!already && !NULL (flag)) + lock_file (fn); + else if (already && NULL (flag)) + unlock_file (fn); + } +#endif /* CLASH_DETECTION */ + + current_buffer->save_modified = NULL (flag) ? MODIFF : 0; + update_mode_lines++; + return flag; +} + +DEFUN ("rename-buffer", Frename_buffer, Srename_buffer, 1, 1, + "sRename buffer (to new name): ", + "Change current buffer's name to NEWNAME (a string).") + (name) + register Lisp_Object name; +{ + register Lisp_Object tem, buf; + + CHECK_STRING (name, 0); + tem = Fget_buffer (name); + if (!NULL (tem)) + error ("Buffer name \"%s\" is in use", XSTRING (name)->data); + + XSET (buf, Lisp_Buffer, current_buffer); + tem = Fmemq (buf, Vminibuffer_list); + if (!NULL (tem)) + error ("Cannot rename a minibuffer"); + + current_buffer->name = name; + Fsetcar (Frassq (buf, Vbuffer_alist), name); + if (NULL (current_buffer->filename) && !NULL (current_buffer->auto_save_file_name)) + call0 (intern ("rename-auto-save-file")); + return Qnil; +} + +DEFUN ("other-buffer", Fother_buffer, Sother_buffer, 0, 1, 0, + "Return most recently selected buffer other than BUFFER.\n\ +Buffers not visible in windows are preferred to visible buffers.\n\ +If no other exists, the buffer *scratch* is returned.\n\ +If BUFFER is omitted or nil, some interesting buffer is returned.") + (buffer) + register Lisp_Object buffer; +{ + register Lisp_Object tail, buf, notsogood, tem; + notsogood = Qnil; + + for (tail = Vbuffer_alist; !NULL (tail); tail = Fcdr (tail)) + { + buf = Fcdr (Fcar (tail)); + if (EQ (buf, buffer)) + continue; + if (XSTRING (XBUFFER (buf)->name)->data[0] == ' ') + continue; + tem = Fget_buffer_window (buf); + if (NULL (tem)) + return buf; + if (NULL (notsogood)) + notsogood = buf; + } + if (!NULL (notsogood)) + return notsogood; + return Fget_buffer_create (build_string ("*scratch*")); +} + +DEFUN ("buffer-flush-undo", Fbuffer_flush_undo, Sbuffer_flush_undo, 1, 1, 0, + "Make BUFFER stop keeping undo information.") + (buf) + register Lisp_Object buf; +{ + CHECK_BUFFER (buf, 0); + XBUFFER (buf)->undo_list = Qt; + return Qnil; +} + +DEFUN ("buffer-enable-undo", Fbuffer_enable_undo, Sbuffer_enable_undo, + 0, 1, "", + "Start keeping undo information for buffer BUFFER (default is current buffer).") + (buf) + register Lisp_Object buf; +{ + if (NULL (buf)) + { + if (EQ (current_buffer->undo_list, Qt)) + current_buffer->undo_list = Qnil; + } + else + { + CHECK_BUFFER (buf, 0); + if (EQ (XBUFFER (buf)->undo_list, Qt)) + XBUFFER (buf)->undo_list = Qnil; + } + return Qnil; +} + +DEFUN ("kill-buffer", Fkill_buffer, Skill_buffer, 1, 1, "bKill buffer: ", + "One arg, a string or a buffer. Get rid of the specified buffer.\n\ +Any processes that have this buffer as the `process-buffer' are killed\n\ +with `delete-process'.") + (bufname) + Lisp_Object bufname; +{ + Lisp_Object buf; + register struct buffer *b; + register Lisp_Object tem; + register struct Lisp_Marker *m; + struct gcpro gcpro1, gcpro2; + + if (NULL (bufname)) + buf = Fcurrent_buffer (); + else + buf = Fget_buffer (bufname); + if (NULL (buf)) + nsberror (bufname); + + b = XBUFFER (buf); + + if (FROM_KBD && !NULL (b->filename) + && BUF_MODIFF (b) > b->save_modified) + { + GCPRO2 (buf, bufname); + tem = Fyes_or_no_p (format1 ("Buffer %s modified; kill anyway? ", + XSTRING (b->name)->data)); + UNGCPRO; + if (NULL (tem)) + return Qnil; + } + + /* We have no more questions to ask. Verify that it is valid + to kill the buffer. This must be done after the questions + since anything can happen within Fyes_or_no_p. */ + + /* Don't kill the minibuffer now current. */ + if (EQ (buf, XWINDOW (minibuf_window)->buffer)) + return Qnil; + + if (NULL (b->name)) + return Qnil; + + /* Make this buffer not be current. + In the process, notice if this is the sole visible buffer + and give up if so. */ + if (b == current_buffer) + { + tem = Fother_buffer (buf); + Fset_buffer (tem); + if (b == current_buffer) + return Qnil; + } + + /* Now there is no question: we can kill the buffer. */ + +#ifdef CLASH_DETECTION + /* Unlock this buffer's file, if it is locked. */ + unlock_buffer (b); +#endif /* CLASH_DETECTION */ + +#ifdef subprocesses + kill_buffer_processes (buf); +#endif subprocesses + + tem = Vinhibit_quit; + Vinhibit_quit = Qt; + Vbuffer_alist = Fdelq (Frassq (buf, Vbuffer_alist), Vbuffer_alist); + Freplace_buffer_in_windows (buf); + Vinhibit_quit = tem; + + /* Unchain all markers of this buffer + and leave them pointing nowhere. */ + for (tem = b->markers; !EQ (tem, Qnil); ) + { + m = XMARKER (tem); + m->buffer = 0; + tem = m->chain; + m->chain = Qnil; + } + b->markers = Qnil; + + b->name = Qnil; + b->undo_list = Qnil; + free (BUF_BEG_ADDR (b)); + + return Qnil; +} + +/* Put the element for buffer `buf' at the front of buffer-alist. + This is done when a buffer is selected "visibly". + It keeps buffer-alist in the order of recency of selection + so that other_buffer will return something nice. */ + +record_buffer (buf) + Lisp_Object buf; +{ + register Lisp_Object link, prev; + + prev = Qnil; + for (link = Vbuffer_alist; CONSP (link); link = XCONS (link)->cdr) + { + if (EQ (XCONS (XCONS (link)->car)->cdr, buf)) + break; + prev = link; + } + + /* Effectively do Vbuffer_alist = Fdelq (link, Vbuffer_alist) + but cannot use Fdelq here it that allows quitting. */ + + if (NULL (prev)) + Vbuffer_alist = XCONS (Vbuffer_alist)->cdr; + else + XCONS (prev)->cdr = XCONS (XCONS (prev)->cdr)->cdr; + + XCONS(link)->cdr = Vbuffer_alist; + Vbuffer_alist = link; +} + +DEFUN ("switch-to-buffer", Fswitch_to_buffer, Sswitch_to_buffer, 1, 2, "BSwitch to buffer: ", + "Select buffer BUFFER in the current window.\n\ +BUFFER may be a buffer or a buffer name.\n\ +Optional second arg NORECORD non-nil means\n\ +do not put this buffer at the front of the list of recently selected ones.\n\ +\n\ +WARNING: This is NOT the way to work on another buffer temporarily\n\ +within a Lisp program! Use `set-buffer' instead. That avoids messing with\n\ +the window-buffer correspondances.") + (bufname, norecord) + Lisp_Object bufname, norecord; +{ + register Lisp_Object buf; + + if (EQ (minibuf_window, selected_window)) + error ("Cannot switch buffers in minibuffer window"); + + if (NULL (bufname)) + buf = Fother_buffer (Fcurrent_buffer ()); + else + buf = Fget_buffer_create (bufname); + Fset_buffer (buf); + if (NULL (norecord)) + record_buffer (buf); + + Fset_window_buffer (EQ (selected_window, minibuf_window) + ? Fnext_window (minibuf_window, Qnil) : selected_window, + buf); + + return Qnil; +} + +DEFUN ("pop-to-buffer", Fpop_to_buffer, Spop_to_buffer, 1, 2, 0, + "Select buffer BUFFER in some window, preferably a different one.\n\ +If pop-up-windows is non-nil, windows can be split to do this.\n\ +If second arg OTHER-WINDOW is non-nil, insist on finding another\n\ +window even if BUFFER is already visible in the selected window.") + (bufname, other) + Lisp_Object bufname, other; +{ + register Lisp_Object buf; + if (NULL (bufname)) + buf = Fother_buffer (Fcurrent_buffer ()); + else + buf = Fget_buffer_create (bufname); + Fset_buffer (buf); + record_buffer (buf); + Fselect_window (Fdisplay_buffer (buf, other)); + return Qnil; +} + +DEFUN ("current-buffer", Fcurrent_buffer, Scurrent_buffer, 0, 0, 0, + "Return the current buffer as a Lisp buffer object.") + () +{ + register Lisp_Object buf; + XSET (buf, Lisp_Buffer, current_buffer); + return buf; +} + +DEFUN ("set-buffer", Fset_buffer, Sset_buffer, 1, 1, 0, + "Set the current buffer to the buffer or buffer name supplied as argument.\n\ +That buffer will then be the default for editing operations and printing.\n\ +This function's effect can't last past end of current command\n\ +because returning to command level\n\ +selects the chosen buffer of the current window,\n\ +and this function has no effect on what buffer that is.\n\ +See also `save-excursion' when you want to select a buffer temporarily.\n\ +Use `switch-to-buffer' or `pop-to-buffer' for interactive buffer selection.") + (bufname) + register Lisp_Object bufname; +{ + register Lisp_Object buffer; + buffer = Fget_buffer (bufname); + if (NULL (buffer)) + nsberror (bufname); + if (NULL (XBUFFER (buffer)->name)) + error ("Selecting deleted buffer"); + set_buffer_internal (XBUFFER (buffer)); + return buffer; +} + +DEFUN ("barf-if-buffer-read-only", Fbarf_if_buffer_read_only, + Sbarf_if_buffer_read_only, 0, 0, 0, + "Signal a buffer-read-only error if the current buffer is read-only.") + () +{ + while (!NULL (current_buffer->read_only)) + Fsignal (Qbuffer_read_only, (Fcons (Fcurrent_buffer (), Qnil))); + return Qnil; +} + +DEFUN ("bury-buffer", Fbury_buffer, Sbury_buffer, 0, 1, "", + "Put BUFFER at the end of the list of all buffers.\n\ +There it is the least likely candidate for other-buffer to return;\n\ +thus, the least likely buffer for \\[switch-to-buffer] to select by default.\n\ +BUFFER is also removed from the selected window if it was displayed there.") + (buf) + register Lisp_Object buf; +{ + register Lisp_Object aelt, link; + + if (NULL (buf)) + { + XSET (buf, Lisp_Buffer, current_buffer); + Fswitch_to_buffer (Fother_buffer (buf), Qnil); + } + else + { + Lisp_Object buf1; + + buf1 = Fget_buffer (buf); + if (NULL (buf1)) + nsberror (buf); + buf = buf1; + } + + aelt = Frassq (buf, Vbuffer_alist); + link = Fmemq (aelt, Vbuffer_alist); + Vbuffer_alist = Fdelq (aelt, Vbuffer_alist); + XCONS (link)->cdr = Qnil; + Vbuffer_alist = nconc2 (Vbuffer_alist, link); + return Qnil; +} + +extern int last_known_column_point; + +/* Set the current buffer to B, which is a C pointer, + rather than a Lisp object. */ + +set_buffer_internal (b) + register struct buffer *b; +{ + register struct buffer *swb = 0; + register struct buffer *old_buf; + register Lisp_Object tail, valcontents; + enum Lisp_Type tem; + + if (current_buffer == b) + return; + +#if 0 + if (XWINDOW (selected_window) != 0) + swb = NULL (selected_window) ? 0 : XBUFFER (XWINDOW (selected_window)->buffer); +#endif + + windows_or_buffers_changed = 1; + + /* Vcheck_symbol is set up to the symbol paragraph-start + in order to check for the bug that clobbers it. */ +/* if (current_buffer && EQ (current_buffer->major_mode, Qlisp_mode) + && XFASTINT (Vcheck_symbol) != 0 + && !NULL (Vcheck_symbol)) + { + valcontents = XSYMBOL (Vcheck_symbol)->value; + if (XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value) + abort (); + if (current_buffer == XBUFFER (XCONS (XCONS (valcontents)->cdr)->car) + && (XTYPE (XCONS (valcontents)->car) != Lisp_String + || XSTRING (XCONS (valcontents)->car)->size != 6)) + abort (); + } +*/ + +#if 0 + if (current_buffer == swb && !NULL (selected_window)) + Fset_marker (XWINDOW (selected_window)->pointm, make_number (point), + XWINDOW (selected_window)->buffer); +#endif + old_buf = current_buffer; + current_buffer = b; +#if 0 + if (b == swb) + { + SET_PT (marker_position (XWINDOW (selected_window)->pointm)); + if (point < BEGV) + point = BEGV; + if (point > ZV) + point = ZV; + } +#endif + last_known_column_point = -1; /* invalidate indentation cache */ + + /* Look down buffer's list of local Lisp variables + to find and update any that forward into C variables. */ + + for (tail = b->local_var_alist; !NULL (tail); tail = XCONS (tail)->cdr) + { + valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value; + if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value + || XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value) + && (tem = XTYPE (XCONS (valcontents)->car), + (tem == Lisp_Boolfwd || tem == Lisp_Intfwd + || tem == Lisp_Objfwd))) + /* Just reference the variable + to cause it to become set for this buffer. */ + Fsymbol_value (XCONS (XCONS (tail)->car)->car); + } + + /* Do the same with any others that were local to the previous buffer */ + + if (old_buf) + for (tail = old_buf->local_var_alist; !NULL (tail); tail = XCONS (tail)->cdr) + { + valcontents = XSYMBOL (XCONS (XCONS (tail)->car)->car)->value; + if ((XTYPE (valcontents) == Lisp_Buffer_Local_Value + || XTYPE (valcontents) == Lisp_Some_Buffer_Local_Value) + && (tem = XTYPE (XCONS (valcontents)->car), + (tem == Lisp_Boolfwd || tem == Lisp_Intfwd + || tem == Lisp_Objfwd))) + /* Just reference the variable + to cause it to become set for this buffer. */ + Fsymbol_value (XCONS (XCONS (tail)->car)->car); + } + /* Vcheck_symbol is set up to the symbol paragraph-start + in order to check for the bug that clobbers it. */ +/*if (EQ (b->major_mode, Qlisp_mode) + && Vcheck_symbol + && !NULL (Vcheck_symbol)) + { + valcontents = XSYMBOL (Vcheck_symbol)->value; + if (XTYPE (valcontents) != Lisp_Some_Buffer_Local_Value) + abort (); + if (b == XBUFFER (XCONS (XCONS (valcontents)->cdr)->car) + && (XTYPE (XCONS (valcontents)->car) != Lisp_String + || XSTRING (XCONS (valcontents)->car)->size != 6)) + abort (); + Fsymbol_value (Vcheck_symbol); + valcontents = XSYMBOL (Vcheck_symbol)->value; + if (b != XBUFFER (XCONS (XCONS (valcontents)->cdr)->car) + || XTYPE (XCONS (valcontents)->car) != Lisp_String + || XSTRING (XCONS (valcontents)->car)->size != 6) + abort (); + } + */ +} + +DEFUN ("erase-buffer", Ferase_buffer, Serase_buffer, 0, 0, 0, + "Delete the entire contents of the current buffer.") + () +{ + Fwiden (); + del_range (BEG, Z); + current_buffer->last_window_start = 1; + /* Prevent warnings, or suspension of auto saving, that would happen + if future size is less than past size. Use of erase-buffer + implies that the future text is not really related to the past text. */ + XFASTINT (current_buffer->save_length) = 0; + return Qnil; +} + +validate_region (b, e) + register Lisp_Object *b, *e; +{ + register int i; + + CHECK_NUMBER_COERCE_MARKER (*b, 0); + CHECK_NUMBER_COERCE_MARKER (*e, 1); + + if (XINT (*b) > XINT (*e)) + { + i = XFASTINT (*b); /* This is legit even if *b is < 0 */ + *b = *e; + XFASTINT (*e) = i; /* because this is all we do with i. */ + } + + if (!(BEGV <= XINT (*b) && XINT (*b) <= XINT (*e) + && XINT (*e) <= ZV)) + args_out_of_range (*b, *e); +} + +Lisp_Object +list_buffers_1 (files) + Lisp_Object files; +{ + register Lisp_Object tail, tem, buf; + Lisp_Object col1, col2, col3, minspace; + register struct buffer *old = current_buffer, *b; + int desired_point = 0; + + XFASTINT (col1) = 19; + XFASTINT (col2) = 25; + XFASTINT (col3) = 40; + XFASTINT (minspace) = 1; + + Fset_buffer (Vstandard_output); + + tail = intern ("Buffer-menu-mode"); + if (!EQ (tail, current_buffer->major_mode) + && (tem = Ffboundp (tail), !NULL (tem))) + call0 (tail); + Fbuffer_flush_undo (Vstandard_output); + current_buffer->read_only = Qnil; + + write_string ("\ + MR Buffer Size Mode File\n\ + -- ------ ---- ---- ----\n", -1); + + for (tail = Vbuffer_alist; !NULL (tail); tail = Fcdr (tail)) + { + buf = Fcdr (Fcar (tail)); + b = XBUFFER (buf); + /* Don't mention the minibuffers. */ + if (XSTRING (b->name)->data[0] == ' ') + continue; + /* Optionally don't mention buffers that lack files. */ + if (!NULL (files) && NULL (b->filename)) + continue; + /* Identify the current buffer. */ + if (b == old) + desired_point = point; + write_string (b == old ? "." : " ", -1); + /* Identify modified buffers */ + write_string (BUF_MODIFF (b) > b->save_modified ? "*" : " ", -1); + write_string (NULL (b->read_only) ? " " : "% ", -1); + Fprinc (b->name, Qnil); + Findent_to (col1, make_number (2)); + XFASTINT (tem) = BUF_Z (b) - BUF_BEG (b); + Fprin1 (tem, Qnil); + Findent_to (col2, minspace); + Fprinc (b->mode_name, Qnil); + Findent_to (col3, minspace); + if (!NULL (b->filename)) + Fprinc (b->filename, Qnil); + write_string ("\n", -1); + } + + current_buffer->read_only = Qt; + set_buffer_internal (old); +/* Foo. This doesn't work since temp_output_buffer_show sets point to 1 + if (desired_point) + BUF_PT (XBUFFER (Vstandard_output)) = desired_point; + */ + return Qnil; +} + +DEFUN ("list-buffers", Flist_buffers, Slist_buffers, 0, 1, "P", + "Display a list of names of existing buffers.\n\ +Inserts it in buffer *Buffer List* and displays that.\n\ +Note that buffers with names starting with spaces are omitted.\n\ +Non-null optional arg FILES-ONLY means mention only file buffers.\n\ +\n\ +The M column contains a * for buffers that are modified.\n\ +The R column contains a % for buffers that are read-only.") + (files) + Lisp_Object files; +{ + internal_with_output_to_temp_buffer ("*Buffer List*", + list_buffers_1, files); + return Qnil; +} + +DEFUN ("kill-all-local-variables", Fkill_all_local_variables, Skill_all_local_variables, + 0, 0, 0, + "Eliminate all the buffer-local variable values of the current buffer.\n\ +This buffer will then see the default values of all variables.") + () +{ + register Lisp_Object alist, sym, tem; + + for (alist = current_buffer->local_var_alist; !NULL (alist); alist = XCONS (alist)->cdr) + { + sym = XCONS (XCONS (alist)->car)->car; + + /* Need not do anything if some other buffer's binding is now encached. */ + tem = XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car; + if (XBUFFER (tem) == current_buffer) + { + /* Symbol is set up for this buffer's old local value. + Set it up for the current buffer with the default value. */ + + tem = XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->cdr; + XCONS (tem)->car = tem; + XCONS (XCONS (XSYMBOL (sym)->value)->cdr)->car = Fcurrent_buffer (); + store_symval_forwarding (sym, XCONS (XSYMBOL (sym)->value)->car, + XCONS (tem)->cdr); + } + } + + reset_buffer_local_variables (current_buffer); + return Qnil; +} + +extern Lisp_Object Vprin1_to_string_buffer; /* in print.c */ +init_buffer_once () +{ + register Lisp_Object tem; + + /* Make sure all markable slots in buffer_defaults + are initialized reasonably, so mark_buffer won't choke. */ + reset_buffer (&buffer_defaults); + reset_buffer (&buffer_local_symbols); + XSET (Vbuffer_defaults, Lisp_Buffer, &buffer_defaults); + XSET (Vbuffer_local_symbols, Lisp_Buffer, &buffer_local_symbols); + + /* Set up the default values of various buffer slots. */ + /* Must do these before making the first buffer! */ + + /* real setup is done in loaddefs.el */ + buffer_defaults.mode_line_format = build_string ("%-"); + buffer_defaults.abbrev_mode = Qnil; + buffer_defaults.overwrite_mode = Qnil; + buffer_defaults.case_fold_search = Qt; + buffer_defaults.auto_fill_hook = Qnil; + buffer_defaults.selective_display = Qnil; + buffer_defaults.selective_display_ellipses = Qt; + buffer_defaults.abbrev_table = Qnil; + buffer_defaults.undo_list = Qnil; + + XFASTINT (buffer_defaults.tab_width) = 8; + buffer_defaults.truncate_lines = Qnil; + buffer_defaults.ctl_arrow = Qt; + + XFASTINT (buffer_defaults.fill_column) = 70; + XFASTINT (buffer_defaults.left_margin) = 0; + + /* Assign the local-flags to the slots that have default values. + The local flag is a bit that is used in the buffer + to say that it has its own local value for the slot. + The local flag bits are in the local_var_flags slot of the buffer. */ + + /* Nothing can work if this isn't true */ + if (sizeof (int) != sizeof (Lisp_Object)) abort (); + + /* 0 means not a lisp var, -1 means always local, else mask */ + bzero (&buffer_local_flags, sizeof buffer_local_flags); + XFASTINT (buffer_local_flags.filename) = -1; + XFASTINT (buffer_local_flags.directory) = -1; + XFASTINT (buffer_local_flags.backed_up) = -1; + XFASTINT (buffer_local_flags.save_length) = -1; + XFASTINT (buffer_local_flags.auto_save_file_name) = -1; + XFASTINT (buffer_local_flags.read_only) = -1; + XFASTINT (buffer_local_flags.major_mode) = -1; + XFASTINT (buffer_local_flags.mode_name) = -1; + XFASTINT (buffer_local_flags.undo_list) = -1; + + XFASTINT (buffer_local_flags.mode_line_format) = 1; + XFASTINT (buffer_local_flags.abbrev_mode) = 2; + XFASTINT (buffer_local_flags.overwrite_mode) = 4; + XFASTINT (buffer_local_flags.case_fold_search) = 8; + XFASTINT (buffer_local_flags.auto_fill_hook) = 0x10; + XFASTINT (buffer_local_flags.selective_display) = 0x20; + XFASTINT (buffer_local_flags.selective_display_ellipses) = 0x40; + XFASTINT (buffer_local_flags.tab_width) = 0x80; + XFASTINT (buffer_local_flags.truncate_lines) = 0x100; + XFASTINT (buffer_local_flags.ctl_arrow) = 0x200; + XFASTINT (buffer_local_flags.fill_column) = 0x400; + XFASTINT (buffer_local_flags.left_margin) = 0x800; + XFASTINT (buffer_local_flags.abbrev_table) = 0x1000; + XFASTINT (buffer_local_flags.syntax_table) = 0x2000; + + Vbuffer_alist = Qnil; + current_buffer = 0; + all_buffers = 0; + + QSFundamental = build_string ("Fundamental"); + + Qfundamental_mode = intern ("fundamental-mode"); + buffer_defaults.major_mode = Qfundamental_mode; + + Qmode_class = intern ("mode-class"); + + Vprin1_to_string_buffer = Fget_buffer_create (build_string (" prin1")); + /* super-magic invisible buffer */ + Vbuffer_alist = Qnil; + + Fset_buffer (Fget_buffer_create (build_string ("*scratch*"))); +} + +init_buffer () +{ + char buf[MAXPATHLEN+1]; + + Fset_buffer (Fget_buffer_create (build_string ("*scratch*"))); + if (getwd (buf) == 0) + fatal ("`getwd' failed: %s.\n", buf); + +#ifndef VMS + /* Maybe this should really use some standard subroutine + whose definition is filename syntax dependent. */ + if (buf[strlen (buf) - 1] != '/') + strcat (buf, "/"); +#endif /* not VMS */ + current_buffer->directory = build_string (buf); +} + +/* initialize the buffer routines */ +syms_of_buffer () +{ + staticpro (&Vbuffer_defaults); + staticpro (&Vbuffer_local_symbols); + staticpro (&Qfundamental_mode); + staticpro (&Qmode_class); + staticpro (&QSFundamental); + staticpro (&Vbuffer_alist); + +/*staticpro (&Qlisp_mode); + Qlisp_mode = intern ("lisp-mode"); +*/ + + /* All these use DEFVAR_LISP_NOPRO because the slots in + buffer_defaults will all be marked via Vbuffer_defaults. */ + + DEFVAR_LISP_NOPRO ("default-mode-line-format", + &buffer_defaults.mode_line_format, + "Default mode-line-format for buffers that do not override it.\n\ +This is the same as (default-value 'mode-line-format)."); + + DEFVAR_LISP_NOPRO ("default-abbrev-mode", + &buffer_defaults.abbrev_mode, + "Default abbrev-mode for buffers that do not override it.\n\ +This is the same as (default-value 'abbrev-mode)."); + + DEFVAR_LISP_NOPRO ("default-ctl-arrow", + &buffer_defaults.ctl_arrow, + "Default ctl-arrow for buffers that do not override it.\n\ +This is the same as (default-value 'ctl-arrow)."); + + DEFVAR_LISP_NOPRO ("default-truncate-lines", + &buffer_defaults.truncate_lines, + "Default truncate-lines for buffers that do not override it.\n\ +This is the same as (default-value 'truncate-lines)."); + + DEFVAR_LISP_NOPRO ("default-fill-column", + &buffer_defaults.fill_column, + "Default fill-column for buffers that do not override it.\n\ +This is the same as (default-value 'fill-column)."); + + DEFVAR_LISP_NOPRO ("default-left-margin", + &buffer_defaults.left_margin, + "Default left-margin for buffers that do not override it.\n\ +This is the same as (default-value 'left-margin)."); + + DEFVAR_LISP_NOPRO ("default-tab-width", + &buffer_defaults.tab_width, + "Default tab-width for buffers that do not override it.\n\ +This is the same as (default-value 'tab-width)."); + + DEFVAR_LISP_NOPRO ("default-case-fold-search", + &buffer_defaults.case_fold_search, + "Default case-fold-search for buffers that do not override it.\n\ +This is the same as (default-value 'case-fold-search)."); + + DEFVAR_PER_BUFFER ("mode-line-format", ¤t_buffer->mode_line_format, 0); + +/* This doc string is too long for cpp; cpp dies. + DEFVAR_PER_BUFFER ("mode-line-format", ¤t_buffer->mode_line_format, + "Template for displaying mode line for current buffer.\n\ +Each buffer has its own value of this variable.\n\ +Value may be a string, a symbol or a list or cons cell.\n\ +For a symbol, its value is used (but it is ignored if t or nil).\n\ + A string appearing directly as the value of a symbol is processed verbatim\n\ + in that the %-constructs below are not recognized.\n\ +For a list whose car is a symbol, the symbol's value is taken,\n\ + and if that is non-nil, the cadr of the list is processed recursively.\n\ + Otherwise, the caddr of the list (if there is one) is processed.\n\ +For a list whose car is a string or list, each element is processed\n\ + recursively and the results are effectively concatenated.\n\ +For a list whose car is an integer, the cdr of the list is processed\n\ + and padded (if the number is positive) or truncated (if negative)\n\ + to the width specified by that number.\n\ +A string is printed verbatim in the mode line except for %-constructs:\n\ + (%-constructs are allowed when the string is the entire mode-line-format\n\ + or when it is found in a cons-cell or a list)\n\ + %b -- print buffer name. %f -- print visited file name.\n\ + %* -- print *, % or hyphen. %m -- print value of mode-name (obsolete).\n\ + %s -- print process status. %M -- print value of global-mode-string. (obs)\n\ + %p -- print percent of buffer above top of window, or top, bot or all.\n\ + %n -- print Narrow if appropriate.\n\ + %[ -- print one [ for each recursive editing level. %] similar.\n\ + %% -- print %. %- -- print infinitely many dashes.\n\ +Decimal digits after the % specify field width to which to pad."); +*/ + + DEFVAR_LISP_NOPRO ("default-major-mode", &buffer_defaults.major_mode, + "*Major mode for new buffers. Defaults to fundamental-mode.\n\ +nil here means use current buffer's major mode."); + + DEFVAR_PER_BUFFER ("major-mode", ¤t_buffer->major_mode, + "Symbol for current buffer's major mode."); + + DEFVAR_PER_BUFFER ("abbrev-mode", ¤t_buffer->abbrev_mode, + "Non-nil turns on automatic expansion of abbrevs when inserted.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("case-fold-search", ¤t_buffer->case_fold_search, + "*Non-nil if searches should ignore case.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("mode-name", ¤t_buffer->mode_name, + "Pretty name of current buffer's major mode (a string)."); + + DEFVAR_PER_BUFFER ("fill-column", ¤t_buffer->fill_column, + "*Column beyond which automatic line-wrapping should happen.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("left-margin", ¤t_buffer->left_margin, + "*Column for the default indent-line-function to indent to.\n\ +Linefeed indents to this column in Fundamental mode.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("tab-width", ¤t_buffer->tab_width, + "*Distance between tab stops (for display of tab characters), in columns.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("ctl-arrow", ¤t_buffer->ctl_arrow, + "*Non-nil means display control chars with uparrow.\n\ +Nil means use backslash and octal digits.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("truncate-lines", ¤t_buffer->truncate_lines, + "*Non-nil means do not display continuation lines;\n\ +give each line of text one screen line.\n\ +Automatically becomes local when set in any fashion.\n\ +\n\ +Note that this is overridden by the variable\n\ +truncate-partial-width-windows if that variable is non-nil\n\ +and this buffer is not full-screen width."); + + DEFVAR_PER_BUFFER ("default-directory", ¤t_buffer->directory, + "Name of default directory of current buffer. Should end with slash."); + + DEFVAR_PER_BUFFER ("auto-fill-hook", ¤t_buffer->auto_fill_hook, + "Function called (if non-nil) after self-inserting a space at column beyond fill-column"); + + DEFVAR_PER_BUFFER ("buffer-file-name", ¤t_buffer->filename, + "Name of file visited in current buffer, or nil if not visiting a file."); + + DEFVAR_PER_BUFFER ("buffer-auto-save-file-name", + ¤t_buffer->auto_save_file_name, + "Name of file for auto-saving current buffer,\n\ +or nil if buffer should not be auto-saved."); + + DEFVAR_PER_BUFFER ("buffer-read-only", ¤t_buffer->read_only, + "Non-nil if this buffer is read-only."); + + DEFVAR_PER_BUFFER ("buffer-backed-up", ¤t_buffer->backed_up, + "Non-nil if this buffer's file has been backed up.\n\ +Backing up is done before the first time the file is saved."); + + DEFVAR_PER_BUFFER ("buffer-saved-size", ¤t_buffer->save_length, + "Length of current buffer when last read in, saved or auto-saved.\n\ +0 initially."); + + DEFVAR_PER_BUFFER ("selective-display", ¤t_buffer->selective_display, + "t enables selective display:\n\ + after a ^M, all the rest of the line is invisible.\n\ + ^M's in the file are written into files as newlines.\n\ +Integer n as value means display only lines\n\ + that start with less than n columns of space.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("selective-display-ellipses", + ¤t_buffer->selective_display_ellipses, + "t means display ... on previous line when a line is invisible.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("overwrite-mode", ¤t_buffer->overwrite_mode, + "Non-nil if self-insertion should replace existing text.\n\ +Automatically becomes local when set in any fashion."); + + DEFVAR_PER_BUFFER ("buffer-undo-list", ¤t_buffer->undo_list, + "List of undo entries in current buffer."); + +/*DEFVAR_LISP ("debug-check-symbol", &Vcheck_symbol, + "Don't ask."); +*/ + defsubr (&Sbuffer_list); + defsubr (&Sget_buffer); + defsubr (&Sget_file_buffer); + defsubr (&Sget_buffer_create); + defsubr (&Sgenerate_new_buffer); + defsubr (&Sbuffer_name); +/*defsubr (&Sbuffer_number);*/ + defsubr (&Sbuffer_file_name); + defsubr (&Sbuffer_local_variables); + defsubr (&Sbuffer_modified_p); + defsubr (&Sset_buffer_modified_p); + defsubr (&Srename_buffer); + defsubr (&Sother_buffer); + defsubr (&Sbuffer_flush_undo); + defsubr (&Sbuffer_enable_undo); + defsubr (&Skill_buffer); + defsubr (&Serase_buffer); + defsubr (&Sswitch_to_buffer); + defsubr (&Spop_to_buffer); + defsubr (&Scurrent_buffer); + defsubr (&Sset_buffer); + defsubr (&Sbarf_if_buffer_read_only); + defsubr (&Sbury_buffer); + defsubr (&Slist_buffers); + defsubr (&Skill_all_local_variables); +} + +keys_of_buffer () +{ + ndefkey (Vctl_x_map, 'b', "switch-to-buffer"); + ndefkey (Vctl_x_map, 'k', "kill-buffer"); + ndefkey (Vctl_x_map, Ctl ('B'), "list-buffers"); +} |