Initial revision

1 files changed, 492 insertions, 0 deletions

diff --git a/src/doc.c b/src/doc.c
new file mode 100644
index 00000000000..952268ccdbb
--- /dev/null
+++ b/src/doc.c
@@ -0,0 +1,492 @@
+/* Record indices of function doc strings stored in a file.
+   Copyright (C) 1985, 1986 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 "config.h"
+
+#include <sys/types.h>
+#include <sys/file.h>	/* Must be after sys/types.h for USG and BSD4_1*/
+
+#ifdef USG5
+#include <fcntl.h>
+#endif
+
+#ifndef O_RDONLY
+#define O_RDONLY 0
+#endif
+
+#undef NULL
+#include "lisp.h"
+#include "buffer.h"
+
+Lisp_Object Vdoc_file_name;
+
+Lisp_Object
+get_doc_string (filepos)
+     long filepos;
+{
+  char buf[512 * 32 + 1];
+  register int fd;
+  register char *name;
+  register char *p, *p1;
+  register int count;
+  extern char *index ();
+
+  if (XTYPE (Vexec_directory) != Lisp_String
+      || XTYPE (Vdoc_file_name) != Lisp_String)
+    return Qnil;
+
+  name = (char *) alloca (XSTRING (Vexec_directory)->size
+			  + XSTRING (Vdoc_file_name)->size + 8);
+  strcpy (name, XSTRING (Vexec_directory)->data);
+  strcat (name, XSTRING (Vdoc_file_name)->data);
+#ifdef VMS
+#ifndef VMS4_4
+  /* For VMS versions with limited file name syntax,
+     convert the name to something VMS will allow.  */
+  p = name;
+  while (*p)
+    {
+      if (*p == '-')
+	*p = '_';
+      p++;
+    }
+#endif /* not VMS4_4 */
+#ifdef VMS4_4
+  strcpy (name, sys_translate_unix (name));
+#endif /* VMS4_4 */
+#endif /* VMS */
+
+  fd = open (name, O_RDONLY, 0);
+  if (fd < 0)
+    error ("Cannot open doc string file \"%s\"", name);
+  if (0 > lseek (fd, filepos, 0))
+    {
+      close (fd);
+      error ("Position %ld out of range in doc string file \"%s\"",
+	     filepos, name);
+    }
+  p = buf;
+  while (p != buf + sizeof buf - 1)
+    {
+      count = read (fd, p, 512);
+      p[count] = 0;
+      if (!count)
+	break;
+      p1 = index (p, '\037');
+      if (p1)
+	{
+	  *p1 = 0;
+	  p = p1;
+	  break;
+	}
+      p += count;
+    }
+  close (fd);
+  return make_string (buf, p - buf);
+}
+
+DEFUN ("documentation", Fdocumentation, Sdocumentation, 1, 1, 0,
+  "Return the documentation string of FUNCTION.")
+  (fun1)
+     Lisp_Object fun1;
+{
+  Lisp_Object fun;
+  Lisp_Object funcar;
+  Lisp_Object tem;
+
+  fun = fun1;
+  while (XTYPE (fun) == Lisp_Symbol)
+    {
+      QUIT;
+      fun = Fsymbol_function (fun);
+    }
+
+  switch (XTYPE (fun))
+    {
+    case Lisp_Subr:
+      if (XSUBR (fun)->doc == 0) return Qnil;
+      if ((int) XSUBR (fun)->doc >= 0)
+	return Fsubstitute_command_keys (build_string (XSUBR (fun)->doc));
+      else
+	return
+	  Fsubstitute_command_keys (get_doc_string (- (int) XSUBR (fun)->doc));
+      
+    case Lisp_Compiled:
+      if (XVECTOR (fun)->size <= COMPILED_DOC_STRING)
+	return Qnil;
+      tem = XVECTOR (fun)->contents[COMPILED_DOC_STRING];
+      if (XTYPE (tem) == Lisp_String)
+	return Fsubstitute_command_keys (tem);
+      if (XTYPE (tem) == Lisp_Int && XINT (tem) >= 0)
+	return Fsubstitute_command_keys (get_doc_string (XFASTINT (tem)));
+      return Qnil;
+
+    case Lisp_String:
+    case Lisp_Vector:
+      return build_string ("Keyboard macro.");
+
+    case Lisp_Cons:
+      funcar = Fcar (fun);
+      if (XTYPE (funcar) != Lisp_Symbol)
+	return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+      if (XSYMBOL (funcar) == XSYMBOL (Qkeymap))
+	return build_string ("Prefix command (definition is a keymap associating keystrokes with\n\
+subcommands.)");
+      if (XSYMBOL (funcar) == XSYMBOL (Qlambda)
+	  || XSYMBOL (funcar) == XSYMBOL (Qautoload))
+	{
+	  tem = Fcar (Fcdr (Fcdr (fun)));
+	  if (XTYPE (tem) == Lisp_String)
+	    return Fsubstitute_command_keys (tem);
+	  if (XTYPE (tem) == Lisp_Int && XINT (tem) >= 0)
+	    return Fsubstitute_command_keys (get_doc_string (XFASTINT (tem)));
+	  return Qnil;
+	}
+      if (XSYMBOL (funcar) == XSYMBOL (Qmocklisp))
+	return Qnil;
+      if (XSYMBOL (funcar) == XSYMBOL (Qmacro))
+	return Fdocumentation (Fcdr (fun));
+
+      /* Fall through to the default to report an error.  */
+
+    default:
+      return Fsignal (Qinvalid_function, Fcons (fun, Qnil));
+    }
+}
+
+DEFUN ("documentation-property", Fdocumentation_property, 
+       Sdocumentation_property, 2, 2, 0,
+  "Return the documentation string that is SYMBOL's PROP property.\n\
+This differs from using `get' only in that it can refer to strings\n\
+stored in the `etc/DOC' file.")
+  (sym, prop)
+     Lisp_Object sym, prop;
+{
+  register Lisp_Object tem;
+
+  tem = Fget (sym, prop);
+  if (XTYPE (tem) == Lisp_Int)
+    tem = get_doc_string (XINT (tem) > 0 ? XINT (tem) : - XINT (tem));
+  return Fsubstitute_command_keys (tem);
+}
+
+DEFUN ("Snarf-documentation", Fsnarf_documentation, Ssnarf_documentation,
+  1, 1, 0,
+  "Used during Emacs initialization, before dumping runnable Emacs,\n\
+to find pointers to doc strings stored in `etc/DOC...' and\n\
+record them in function definitions.\n\
+One arg, FILENAME, a string which does not include a directory.\n\
+The file is found in `../etc' now; found in the `exec-directory'\n\
+when doc strings are referred to later in the dumped Emacs.")
+  (filename)
+     Lisp_Object filename;
+{
+  int fd;
+  char buf[1024 + 1];
+  register int filled;
+  register int pos;
+  register char *p, *end;
+  Lisp_Object sym, fun, tem;
+  char *name;
+  extern char *index ();
+
+  CHECK_STRING (filename, 0);
+
+#ifndef CANNOT_DUMP
+  name = (char *) alloca (XSTRING (filename)->size + 8);
+  strcpy (name, "../etc/");
+#else /* CANNOT_DUMP */
+  CHECK_STRING (Vexec_directory, 0);
+  name = (char *) alloca (XSTRING (filename)->size +
+			  XSTRING (Vexec_directory)->size + 1);
+  strcpy (name, XSTRING (Vexec_directory)->data);
+#endif /* CANNOT_DUMP */
+  strcat (name, XSTRING (filename)->data); 	/*** Add this line ***/
+#ifdef VMS
+#ifndef VMS4_4
+  /* For VMS versions with limited file name syntax,
+     convert the name to something VMS will allow.  */
+  p = name;
+  while (*p)
+    {
+      if (*p == '-')
+	*p = '_';
+      p++;
+    }
+#endif /* not VMS4_4 */
+#ifdef VMS4_4
+  strcpy (name, sys_translate_unix (name));
+#endif /* VMS4_4 */
+#endif /* VMS */
+
+  fd = open (name, O_RDONLY, 0);
+  if (fd < 0)
+    report_file_error ("Opening doc string file",
+		       Fcons (build_string (name), Qnil));
+  Vdoc_file_name = filename;
+  filled = 0;
+  pos = 0;
+  while (1)
+    {
+      if (filled < 512)
+	filled += read (fd, &buf[filled], sizeof buf - 1 - filled);
+      if (!filled)
+	break;
+
+      buf[filled] = 0;
+      p = buf;
+      end = buf + (filled < 512 ? filled : filled - 128);
+      while (p != end && *p != '\037') p++;
+      /* p points to ^_Ffunctionname\n or ^_Vvarname\n.  */
+      if (p != end)
+	{
+	  end = index (p, '\n');
+	  sym = oblookup (Vobarray, p + 2, end - p - 2);
+	  if (XTYPE (sym) == Lisp_Symbol)
+	    {
+	      /* Attach a docstring to a variable?  */
+	      if (p[1] == 'V')
+		{
+		  /* Install file-position as variable-documentation property
+		     and make it negative for a user-variable
+		     (doc starts with a `*').  */
+		  Fput (sym, Qvariable_documentation,
+			make_number ((pos + end + 1 - buf)
+				     * (end[1] == '*' ? -1 : 1)));
+		}
+
+	      /* Attach a docstring to a function?  The type determines where
+	         the docstring is stored.  */
+	      else if (p[1] == 'F')
+		{
+		  fun = XSYMBOL (sym)->function;
+
+		  /* Lisp_Subrs have a slot for it.  */
+		  if (XTYPE (fun) == Lisp_Subr)
+		    XSUBR (fun)->doc = (char *) - (pos + end + 1 - buf);
+
+		  /* If it's a lisp form, stick it in the form.  */
+		  else if (CONSP (fun))
+		    {
+		      tem = XCONS (fun)->car;
+		      if (EQ (tem, Qlambda) || EQ (tem, Qautoload))
+			{
+			  tem = Fcdr (Fcdr (fun));
+			  if (CONSP (tem) &&
+			      XTYPE (XCONS (tem)->car) == Lisp_Int)
+			    XFASTINT (XCONS (tem)->car) = (pos + end + 1 - buf);
+			}
+		    }
+
+		  /* Bytecode objects sometimes have slots for it.  */
+		  else if (XTYPE (fun) == Lisp_Compiled)
+		    {
+		      /* This bytecode object must have a slot for the
+			 docstring, since we've found a docstring for it.  */
+		      if (XVECTOR (fun)->size <= COMPILED_DOC_STRING)
+			abort ();
+
+		      XFASTINT (XVECTOR (fun)->contents[COMPILED_DOC_STRING])
+			= pos + end + 1 - buf;
+		    }
+		}
+	      else error ("DOC file invalid at position %d", pos);
+	    }
+	}
+      pos += end - buf;
+      filled -= end - buf;
+      bcopy (end, buf, filled);
+    }
+  close (fd);
+  return Qnil;
+}
+
+DEFUN ("substitute-command-keys", Fsubstitute_command_keys,
+  Ssubstitute_command_keys, 1, 1, 0,
+  "Substitute key descriptions for command names in STRING.\n\
+Return a new string which is STRING with substrings of the form \\=\\[COMMAND]\n\
+replaced by either:  a keystroke sequence that will invoke COMMAND,\n\
+or \"M-x COMMAND\" if COMMAND is not on any keys.\n\
+Substrings of the form \\=\\{MAPVAR} are replaced by summaries\n\
+\(made by describe-bindings) of the value of MAPVAR, taken as a keymap.\n\
+Substrings of the form \\=\\<MAPVAR> specify to use the value of MAPVAR\n\
+as the keymap for future \\=\\[COMMAND] substrings.\n\
+\\=\\= quotes the following character and is discarded;\n\
+thus, \\=\\=\\=\\= puts \\=\\= into the output, and \\=\\=\\=\\[ puts \\=\\[ into the output.")
+  (str)
+     Lisp_Object str;
+{
+  unsigned char *buf;
+  int changed = 0;
+  register unsigned char *strp;
+  register unsigned char *bufp;
+  int idx;
+  int bsize;
+  unsigned char *new;
+  register Lisp_Object tem;
+  Lisp_Object keymap;
+  unsigned char *start;
+  int length;
+  struct gcpro gcpro1;
+
+  if (NULL (str))
+    return Qnil;
+
+  CHECK_STRING (str, 0);
+  GCPRO1 (str);
+
+  keymap = current_buffer->keymap;
+
+  bsize = XSTRING (str)->size;
+  bufp = buf = (unsigned char *) xmalloc (bsize);
+
+  strp = (unsigned char *) XSTRING (str)->data;
+  while (strp < (unsigned char *) XSTRING (str)->data + XSTRING (str)->size)
+    {
+      if (strp[0] == '\\' && strp[1] == '=')
+	{
+	  /* \= quotes the next character;
+	     thus, to put in \[ without its special meaning, use \=\[.  */
+	  changed = 1;
+	  *bufp++ = strp[2];
+	  strp += 3;
+	}
+      else if (strp[0] == '\\' && strp[1] == '[')
+	{
+	  changed = 1;
+	  strp += 2;		/* skip \[ */
+	  start = strp;
+
+	  while ((strp - (unsigned char *) XSTRING (str)->data
+		  < XSTRING (str)->size)
+		 && *strp != ']')
+	    strp++;
+	  length = strp - start;
+	  strp++;		/* skip ] */
+
+	  /* Save STRP in IDX.  */
+	  idx = strp - (unsigned char *) XSTRING (str)->data;
+	  tem = Fintern (make_string (start, length), Qnil);
+	  tem = Fwhere_is_internal (tem, keymap, Qnil, Qt, Qnil);
+
+	  if (NULL (tem))	/* but not on any keys */
+	    {
+	      new = (unsigned char *) xrealloc (buf, bsize += 4);
+	      bufp += new - buf;
+	      buf = new;
+	      bcopy ("M-x ", bufp, 4);
+	      bufp += 4;
+	      goto subst;
+	    }
+	  else
+	    {			/* function is on a key */
+	      tem = Fkey_description (tem);
+	      goto subst_string;
+	    }
+	}
+      /* \{foo} is replaced with a summary of the keymap (symbol-value foo).
+	 \<foo> just sets the keymap used for \[cmd].  */
+      else if (strp[0] == '\\' && (strp[1] == '{' || strp[1] == '<'))
+	{
+	  struct buffer *oldbuf;
+	  Lisp_Object name;
+
+	  changed = 1;
+	  strp += 2;		/* skip \{ or \< */
+	  start = strp;
+
+	  while ((strp - (unsigned char *) XSTRING (str)->data
+		  < XSTRING (str)->size)
+		 && *strp != '}' && *strp != '>')
+	    strp++;
+	  length = strp - start;
+	  strp++;			/* skip } or > */
+
+	  /* Save STRP in IDX.  */
+	  idx = strp - (unsigned char *) XSTRING (str)->data;
+
+	  /* Get the value of the keymap in TEM, or nil if undefined.
+	     Do this while still in the user's current buffer
+	     in case it is a local variable.  */
+	  name = Fintern (make_string (start, length), Qnil);
+	  tem = Fboundp (name);
+	  if (! NULL (tem))
+	    {
+	      tem = Fsymbol_value (name);
+	      if (! NULL (tem))
+		tem = get_keymap_1 (tem, 0);
+	    }
+
+	  /* Now switch to a temp buffer.  */
+	  oldbuf = current_buffer;
+	  set_buffer_internal (XBUFFER (Vprin1_to_string_buffer));
+
+	  if (NULL (tem))
+	    {
+	      name = Fsymbol_name (name);
+	      insert_string ("\nUses keymap \"");
+	      insert_from_string (name, 0, XSTRING (name)->size);
+	      insert_string ("\", which is not currently defined.\n");
+	      if (start[-1] == '<') keymap = Qnil;
+	    }
+	  else if (start[-1] == '<')
+	    keymap = tem;
+	  else
+	    describe_map_tree (tem, 1, Qnil);
+	  tem = Fbuffer_string ();
+	  Ferase_buffer ();
+	  set_buffer_internal (oldbuf);
+
+	subst_string:
+	  start = XSTRING (tem)->data;
+	  length = XSTRING (tem)->size;
+	subst:
+	  new = (unsigned char *) xrealloc (buf, bsize += length);
+	  bufp += new - buf;
+	  buf = new;
+	  bcopy (start, bufp, length);
+	  bufp += length;
+	  /* Check STR again in case gc relocated it.  */
+	  strp = (unsigned char *) XSTRING (str)->data + idx;
+	}
+      else			/* just copy other chars */
+	*bufp++ = *strp++;
+    }
+
+  if (changed)			/* don't bother if nothing substituted */
+    tem = make_string (buf, bufp - buf);
+  else
+    tem = str;
+  UNGCPRO;
+  free (buf);
+  return tem;
+}
+
+syms_of_doc ()
+{
+  DEFVAR_LISP ("internal-doc-file-name", &Vdoc_file_name,
+    "Name of file containing documentation strings of built-in symbols.");
+  Vdoc_file_name = Qnil;
+
+  defsubr (&Sdocumentation);
+  defsubr (&Sdocumentation_property);
+  defsubr (&Ssnarf_documentation);
+  defsubr (&Ssubstitute_command_keys);
+}