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/*
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/*
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 *  R : A Computer Langage for Statistical Data Analysis
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 *  R : A Computer Langage for Statistical Data Analysis
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 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
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 *  Copyright (C) 1999  The R Core Development Team
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 *  Copyright (C) 1998, 1999  Guido Masarotto
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 *
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *  (at your option) any later version.
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 *  You should have received a copy of the GNU General Public License
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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 */
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#include "Defn.h"
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#include "Print.h"
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#include "Fileio.h"
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#include "../unix/edit.c"
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#include "IOStuff.h"
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#include "Parse.h"
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#include <stdio.h>
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#include "run.h"
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/*
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 * ed, vi etc have 3 parameters. the data, a file and an editor
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 *
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 * if file is specified then the given file is used (and not removed on exit) if
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 * file is not specified then a temporary file is used; since only one
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 * temporary file is used for an entire session previous editing is lost
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 *
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 * if data is specified then it is passed out to be edited; if data is not
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 * specified then either file (if specified) or the temporary file is used
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 * (thus errors can be re-editied by calling edit a second time with no
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 * arguments).
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 *
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 * if the editor is specified then the specified editor is invoked if possible
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 * and an error message reported otherwise
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 */
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static char DefaultFileName[MAX_PATH];
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void InitEd()
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{
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    char *tmp;
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    tmp = getenv("TMP");
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    if (!tmp) tmp = getenv("TEMP");
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    if (!tmp) getenv("R_USER");
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    sprintf(DefaultFileName,"%s/XXXXXX",tmp);
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    mktemp(DefaultFileName);
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}
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SEXP do_edit(SEXP call, SEXP op, SEXP args, SEXP rho)
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{
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    int   i, rc, status;
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    SEXP  x, fn, envir, ed;
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    char *filename, *editcmd, *vmaxsave;
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    FILE *fp;
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    checkArity(op, args);
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    vmaxsave = vmaxget();
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    x = CAR(args);
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    if (TYPEOF(x) == CLOSXP) envir = CLOENV(x);
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    else envir = R_NilValue;
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    PROTECT(envir);
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    fn = CADR(args);
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    if (!isString(fn))
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	error("invalid argument to edit()\n");
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    if (LENGTH(STRING(fn)[0]) > 0) {
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	filename = R_alloc(strlen(CHAR(STRING(fn)[0])), sizeof(char));
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	strcpy(filename, CHAR(STRING(fn)[0]));
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    } else
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	filename = DefaultFileName;
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    if (x != R_NilValue) {
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	if ((fp = R_fopen(filename, "w")) == NULL)
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	    errorcall(call, "unable to open file\n");
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	x = deparse1(x, 0);
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	for (i = 0; i < LENGTH(x); i++)
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	    fprintf(fp, "%s\n", CHAR(STRING(x)[i]));
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	fclose(fp);
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    }
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    ed = CAR(CDDR(args));
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    if (!isString(ed))
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	error("editor type not valid\n");
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    editcmd = R_alloc(strlen(CHAR(STRING(ed)[0])) + strlen(filename) + 2, sizeof(char));
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    sprintf(editcmd, "%s %s", CHAR(STRING(ed)[0]), filename);
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    rc = runcmd(editcmd, 1, 1, "");
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    if (rc == NOLAUNCH)
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	errorcall(call, "unable to run editor\n");
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    if (rc != 0)
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	warningcall(call, "editor ran but returned error status\n");
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    if ((fp = R_fopen(filename, "r")) == NULL)
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	errorcall(call, "unable to open file to read\n");
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    R_ParseCnt = 0;
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    x = PROTECT(R_ParseFile(fp, -1, &status));
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    if (status != PARSE_OK)
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	errorcall(call, "An error occurred on line %d\n use a command like\n x <- vi()\n to recover\n", R_ParseError);
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    else
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	fclose(fp);
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    R_ResetConsole();
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    {   /* can't just eval(x) here */
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	int i, n;
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	SEXP tmp;
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	n = LENGTH(x);
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	for (i = 0 ; i < n ; i++)
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	    tmp = eval(VECTOR(x)[i], R_GlobalEnv);
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	x = tmp;
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    }
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    if (TYPEOF(x) == CLOSXP && envir != R_NilValue)
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	CLOENV(x) = envir;
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    UNPROTECT(2);
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    vmaxset(vmaxsave);
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    return (x);
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}
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