% $Id: mpost.w 1113 2009-08-12 08:16:29Z taco $
%
% Copyright 2008-2009 Taco Hoekwater.
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU Lesser General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% This program 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 Lesser General Public License for more details.
%
% You should have received a copy of the GNU Lesser General Public License
% along with this program.  If not, see <http://www.gnu.org/licenses/>.

\font\tenlogo=logo10 % font used for the METAFONT logo
\def\MP{{\tenlogo META}\-{\tenlogo POST}}

\def\title{MetaPost executable}
\def\[#1]{#1.}
\pdfoutput=1

@*\MP\ executable.

Now that all of \MP\ is a library, a separate program is needed to 
have our customary command-line interface. 

@ First, here are the C includes. |avl.h| is needed because of an 
|avl_allocator| that is defined in |mplib.h|

@d true 1
@d false 0
 
@c
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#if defined (HAVE_SYS_TIME_H)
#include <sys/time.h>
#elif defined (HAVE_SYS_TIMEB_H)
#include <sys/timeb.h>
#endif
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <mplib.h>
#include <mpxout.h>
#ifdef WIN32
#include <process.h>
#endif
#include <kpathsea/kpathsea.h>
extern KPSEDLL char *kpathsea_version_string;
@= /*@@null@@*/ @> static char *mpost_tex_program = NULL;
static int debug = 0; /* debugging for makempx */
#ifdef WIN32
#define GETCWD _getcwd
#else
#define GETCWD getcwd
#endif
static boolean recorder_enabled = false;
static string recorder_name = NULL;
static FILE *recorder_file = NULL;
static char *job_name = NULL;
static char *job_area = NULL;
static int dvitomp_only = 0;

@ Allocating a bit of memory, with error detection:

@d mpost_xfree(A) do { if (A!=NULL) free(A); A=NULL; } while (0)

@c
@= /*@@only@@*/ /*@@out@@*/ @> static void  *mpost_xmalloc (size_t bytes) {
  void *w = malloc (bytes); 
  if (w==NULL) {
    fprintf(stderr,"Out of memory!\n");
    exit(EXIT_FAILURE);
  }
  return w;
}
@= /*@@only@@*/ @> static char *mpost_xstrdup(const char *s) {
  char *w; 
  w = strdup(s);
  if (w==NULL) {
    fprintf(stderr,"Out of memory!\n");
    exit(EXIT_FAILURE);
  }
  return w;
}
static char *mpost_itoa (int i) {
  char res[32] ;
  unsigned idx = 30;
  unsigned v = (unsigned)abs(i);
  memset(res,0,32*sizeof(char));
  while (v>=10) {
    char d = (char)(v % 10);
    v = v / 10;
    res[idx--] = d;
  }
  res[idx--] = (char)v;
  if (i<0) {
      res[idx--] = '-';
  }
  return mpost_xstrdup(res+idx);
}


@ @c
static void mpost_run_editor (MP mp, char *fname, int fline) {
  char *temp, *command, *edit_value;
  char c;
  boolean sdone, ddone;
  sdone = ddone = false;
  edit_value = kpse_var_value ("MPEDIT");
  if (edit_value == NULL)
    edit_value = getenv("EDITOR");
  if (edit_value == NULL) {
    fprintf (stderr,"call_edit: can't find a suitable MPEDIT or EDITOR variable\n");
    exit(mp_status(mp));    
  }
  command = (string) mpost_xmalloc (strlen (edit_value) + strlen(fname) + 11 + 3);
  temp = command;
  while ((c = *edit_value++) != (char)0) {
      if (c == '%')   {
        switch (c = *edit_value++) {
	  case 'd':
	    if (ddone) {
              fprintf (stderr,"call_edit: `%%d' appears twice in editor command\n");
              exit(EXIT_FAILURE);  
            } else {
              char *s = mpost_itoa(fline);
              if (s != NULL) {
                while (*s != '\0')
	          *temp++ = *s++;
                free(s);
              }
              ddone = true;
            }
            break;
	  case 's':
            if (sdone) {
              fprintf (stderr,"call_edit: `%%s' appears twice in editor command\n");
              exit(EXIT_FAILURE);
            } else {
              while (*fname != '\0')
		*temp++ = *fname++;
              *temp++ = '.';
	      *temp++ = 'm';
	      *temp++ = 'p';
              sdone = true;
            }
            break;
	  case '\0':
            *temp++ = '%';
            /* Back up to the null to force termination.  */
	    edit_value--;
	    break;
	  default:
	    *temp++ = '%';
	    *temp++ = c;
	    break;
	  }
     } else {
     	*temp++ = c;
     }
   }
  *temp = '\0';
  if (system (command) != 0)
    fprintf (stderr, "! Trouble executing `%s'.\n", command);
  exit(EXIT_FAILURE);
}

@ 
@<Register the callback routines@>=
options->run_editor = mpost_run_editor;

@
@c 
static string normalize_quotes (const char *name, const char *mesg) {
    boolean quoted = false;
    boolean must_quote = (strchr(name, ' ') != NULL);
    /* Leave room for quotes and NUL. */
    string ret = (string)mpost_xmalloc(strlen(name)+3);
    string p;
    const_string q;
    p = ret;
    if (must_quote)
        *p++ = '"';
    for (q = name; *q != '\0'; q++) {
        if (*q == '"')
            quoted = !quoted;
        else
            *p++ = *q;
    }
    if (must_quote)
        *p++ = '"';
    *p = '\0';
    if (quoted) {
        fprintf(stderr, "! Unbalanced quotes in %s %s\n", mesg, name);
        exit(EXIT_FAILURE);
    }
    return ret;
}

@ Helpers for the filename recorder.

@c
void recorder_start(char *jobname) {
    char cwd[1024];
    if (jobname==NULL) {
      recorder_name = mpost_xstrdup("mpout.fls");
    } else {
      recorder_name = (string)xmalloc((unsigned int)(strlen(jobname)+5));
      strcpy(recorder_name, jobname);
      strcat(recorder_name, ".fls");
    }
    recorder_file = xfopen(recorder_name, FOPEN_W_MODE);

    if(GETCWD(cwd,1020) != NULL) {
      fprintf(recorder_file, "PWD %s\n", cwd);
    } else {
      fprintf(recorder_file, "PWD <unknown>\n");
    }
}


@ @c 
@= /*@@null@@*/ @> static char *makempx_find_file (MPX mpx, const char *nam, 
                                                   const char *mode, int ftype) {
  int fmt;
  boolean req;
  (void) mpx;
  if (mode[0] != 'r') { 
     return strdup(nam);
  }
  req = true; fmt = -1;
  switch(ftype) {
  case mpx_tfm_format:       fmt = kpse_tfm_format; break;
  case mpx_vf_format:        fmt = kpse_vf_format; req = false; break;
  case mpx_trfontmap_format: fmt = kpse_mpsupport_format; break;
  case mpx_trcharadj_format: fmt = kpse_mpsupport_format; break;
  case mpx_desc_format:      fmt = kpse_troff_font_format; break;
  case mpx_fontdesc_format:  fmt = kpse_troff_font_format; break;
  case mpx_specchar_format:  fmt = kpse_mpsupport_format; break;
  }
  if (fmt<0) return NULL;
  return  kpse_find_file (nam, fmt, req);
}

@ Invoke {\tt makempx} (or {\tt troffmpx}) to make sure there is an
   up-to-date {\tt .mpx} file for a given {\tt .mp} file.  (Original
   from John Hobby 3/14/90)

@d default_args " --parse-first-line --interaction=nonstopmode"
@d TEX     "tex"
@d TROFF   "soelim | eqn -Tps -d$$ | troff -Tps"

@c
#ifndef MPXCOMMAND
#define MPXCOMMAND "makempx"
#endif
static int mpost_run_make_mpx (MP mp, char *mpname, char *mpxname) {
  int ret;
  char *cnf_cmd = kpse_var_value ("MPXCOMMAND");
  if (cnf_cmd != NULL && (strcmp (cnf_cmd, "0")==0)) {
    /* If they turned off this feature, just return success.  */
    ret = 0;
  } else {
    /* We will invoke something. Compile-time default if nothing else.  */
    char *cmd, *tmp, *qmpname, *qmpxname;
    if (job_area != NULL) {
      char *l = mpost_xmalloc(strlen(mpname)+strlen(job_area)+1);
      strcpy(l, job_area);
      strcat(l, mpname);
      tmp = normalize_quotes(l, "mpname");
      mpost_xfree(l);
    } else {
      tmp = normalize_quotes(mpname, "mpname");
    }
    qmpname = kpse_find_file (tmp,kpse_mp_format, true);
    mpost_xfree(tmp);
    if (qmpname != NULL && job_area != NULL) {
       /* if there is a usable mpx file in the source path already,
          simply use that and return true */
      char *l = mpost_xmalloc(strlen(qmpname)+2);
      strcpy(l, qmpname);
      strcat(l, "x");
      qmpxname = l;
      if (qmpxname) {
#if HAVE_SYS_STAT_H
        struct stat source_stat, target_stat;
        int nothingtodo = 0;       
        if ((stat(qmpxname, &target_stat) >= 0) &&
            (stat(qmpname, &source_stat) >= 0)) {
#if HAVE_ST_MTIM
          if (source_stat.st_mtim.tv_sec <= target_stat.st_mtim.tv_sec || 
             (source_stat.st_mtim.tv_sec  == target_stat.st_mtim.tv_sec && 
              source_stat.st_mtim.tv_nsec <= target_stat.st_mtim.tv_nsec))
     	    nothingtodo = 1;
#else
          if (source_stat.st_mtime <= target_stat.st_mtime)
  	        nothingtodo = 1;
#endif
        }
        if (nothingtodo == 1)
          return 1; /* success ! */
#endif
      }
    }
    qmpxname = normalize_quotes(mpxname, "mpxname");
    if (cnf_cmd!=NULL && (strcmp (cnf_cmd, "1")!=0)) {
      if (mp_troff_mode(mp)!=0)
        cmd = concatn (cnf_cmd, " -troff ",
                     qmpname, " ", qmpxname, NULL);
      else if (mpost_tex_program!=NULL && *mpost_tex_program != '\0')
        cmd = concatn (cnf_cmd, " -tex=", mpost_tex_program, " ",
                     qmpname, " ", qmpxname, NULL);
      else
        cmd = concatn (cnf_cmd, " -tex ", qmpname, " ", qmpxname, NULL);
  
      /* Run it.  */
      ret = system (cmd);
      free (cmd);
      mpost_xfree(qmpname);
      mpost_xfree(qmpxname);
    } else {
      mpx_options * mpxopt;
      char *s = NULL;
      char *maincmd = NULL;
      int mpxmode = mp_troff_mode(mp);
      char *mpversion = mp_metapost_version () ;
      mpxopt = mpost_xmalloc(sizeof(mpx_options));
      if (mpost_tex_program != NULL && *mpost_tex_program != '\0') {
        maincmd = mpost_xstrdup(mpost_tex_program);
      } else {
        if (mpxmode == mpx_tex_mode) {
          s = kpse_var_value("TEX");
          if (s==NULL) s = kpse_var_value("MPXMAINCMD");
          if (s==NULL) s = mpost_xstrdup (TEX);
          maincmd = (char *)mpost_xmalloc (strlen(s)+strlen(default_args)+1);
          strcpy(maincmd,s);
          strcat(maincmd,default_args);
          free(s);
        } else {
          s = kpse_var_value("TROFF");
          if (s==NULL) s = kpse_var_value("MPXMAINCMD");
          if (s==NULL) s = mpost_xstrdup (TROFF);
          maincmd = s;
        }
      }
      mpxopt->mode = mpxmode;
      mpxopt->cmd  = maincmd;
      mpxopt->mptexpre = kpse_var_value("MPTEXPRE");
      mpxopt->debug = debug;
      mpxopt->mpname = qmpname;
      mpxopt->mpxname = qmpxname;
      mpxopt->find_file = makempx_find_file;
      {
        char *banner = "% Written by metapost version ";
        mpxopt->banner = mpost_xmalloc(strlen(mpversion)+strlen(banner)+1);
        strcpy (mpxopt->banner, banner);
        strcat (mpxopt->banner, mpversion);
      }
      ret = mpx_makempx(mpxopt);
      mpost_xfree(mpxopt->cmd);
      mpost_xfree(mpxopt->mptexpre);
      mpost_xfree(mpxopt->banner);
      mpost_xfree(mpxopt->mpname);
      mpost_xfree(mpxopt->mpxname);
      mpost_xfree(mpxopt);
      mpost_xfree(mpversion);
    }
  }

  mpost_xfree (cnf_cmd);
  return (int)(ret == 0);
}

static int mpost_run_dvitomp (char *dviname, char *mpxname) {
    int i, ret;
    char *m, *d;
    mpx_options * mpxopt;
    char *mpversion = mp_metapost_version () ;
    mpxopt = mpost_xmalloc(sizeof(mpx_options));
    memset(mpxopt,0,sizeof(mpx_options));
    mpxopt->mode = mpx_tex_mode;
    if (dviname == NULL)
      return EXIT_FAILURE;
    i = strlen(dviname);
    if (mpxname==NULL) {
      m = mpost_xstrdup(dviname);
      if (i>4 && *(m+i-4)=='.'
        && *(m+i-3)=='d'  && *(m+i-2)=='v'  && *(m+i-1)=='i')
         *(m+i-4)='\0' ;
    } else {
      m = mpost_xstrdup(mpxname);
    }
    d = mpost_xstrdup(dviname);
    if (!(i>4 && *(d+i-4)=='.'
       && *(d+i-3)=='d'  && *(d+i-2)=='v'  && *(d+i-1)=='i')) {
      char *s = malloc (i+5);
      memset(s,0,i+5);
      s = strcat(s, d);
      (void)strcat(s+i-1, ".dvi");
      mpost_xfree (d);
      d = s ;
    }

    i = strlen(m);
    if (i>4 && *(m+i-4)=='.'
      && *(m+i-3)=='m'  && *(m+i-2)=='p'  && *(m+i-1)=='x') {
    } else {
      char *s = malloc (i+5);
      memset(s,0,i+5);
      s = strcat(s, m);
      (void)strcat(s+i-1, ".mpx");
      mpost_xfree (m);
      m = s ;
    }
    mpxopt->mpname = d;
    mpxopt->mpxname = m;

    mpxopt->find_file = makempx_find_file;
    {
      char *banner = "% Written by dvitomp version ";
      mpxopt->banner = mpost_xmalloc(strlen(mpversion)+strlen(banner)+1);
      strcpy (mpxopt->banner, banner);
      strcat (mpxopt->banner, mpversion);
    }
    ret = mpx_run_dvitomp(mpxopt);
    mpost_xfree(mpxopt->banner);
    mpost_xfree(mpxopt);
    mpost_xfree(mpversion);
    return ret;
}


@ 
@<Register the callback routines@>=
if (!nokpse)
  options->run_make_mpx = mpost_run_make_mpx;


@ @c 
static int get_random_seed (void) {
  int ret = 0;
#if defined (HAVE_GETTIMEOFDAY)
  struct timeval tv;
  gettimeofday(&tv, NULL);
  ret = (tv.tv_usec + 1000000 * tv.tv_usec);
#elif defined (HAVE_FTIME)
  struct timeb tb;
  ftime(&tb);
  ret = (tb.millitm + 1000 * tb.time);
#else
  time_t clock = time ((time_t*)NULL);
  struct tm *tmptr = localtime(&clock);
  if (tmptr!=NULL)
    ret = (tmptr->tm_sec + 60*(tmptr->tm_min + 60*tmptr->tm_hour));
#endif
  return ret;
}

@ @<Register the callback routines@>=
options->random_seed = get_random_seed();

@ @c 
static char *mpost_find_file(MP mp, const char *fname, const char *fmode, int ftype)  {
  size_t l ;
  char *s;
  (void)mp;
  s = NULL;
  if (fmode[0]=='r') {
	if ((job_area != NULL) &&
        (ftype>=mp_filetype_text || ftype==mp_filetype_program )) {
      char *f = mpost_xmalloc(strlen(job_area)+strlen(fname)+1);
      strcpy(f,job_area);
      strcat(f,fname);
      if (ftype>=mp_filetype_text) {
        s = kpse_find_file (f, kpse_mp_format, 0); 
      } else {
        l = strlen(f);
   	    if (l>3 && strcmp(f+l-3,".mf")==0) {
   	      s = kpse_find_file (f,kpse_mf_format, 0); 
#if HAVE_SYS_STAT_H
        } else if (l>4 && strcmp(f+l-4,".mpx")==0) {
          struct stat source_stat, target_stat;
          char *mpname = mpost_xstrdup(f);
          *(mpname + strlen(mpname) -1 ) = '\0';
          printf("statting %s and %s\n", mpname, f);
          if ((stat(f, &target_stat) >= 0) &&
              (stat(mpname, &source_stat) >= 0)) {
#if HAVE_ST_MTIM
            if (source_stat.st_mtim.tv_sec <= target_stat.st_mtim.tv_sec || 
               (source_stat.st_mtim.tv_sec  == target_stat.st_mtim.tv_sec && 
                source_stat.st_mtim.tv_nsec <= target_stat.st_mtim.tv_nsec))
     	        s = mpost_xstrdup(f);
#else
            if (source_stat.st_mtime <= target_stat.st_mtime)
  	            s = mpost_xstrdup(f);
#endif
          }
          mpost_xfree(mpname);
#endif
        } else {
   	      s = kpse_find_file (f,kpse_mp_format, 0); 
        }
      }
      mpost_xfree(f);
      if (s!=NULL) {
        return s;
      }
    }
	if (ftype>=mp_filetype_text) {
      s = kpse_find_file (fname, kpse_mp_format, 0); 
    } else {
      switch(ftype) {
      case mp_filetype_program: 
        l = strlen(fname);
   	    if (l>3 && strcmp(fname+l-3,".mf")==0) {
   	      s = kpse_find_file (fname, kpse_mf_format, 0); 
        } else {
   	      s = kpse_find_file (fname, kpse_mp_format, 0); 
        }
        break;
      case mp_filetype_memfile: 
        s = kpse_find_file (fname, kpse_mem_format, 1); 
        break;
      case mp_filetype_metrics: 
        s = kpse_find_file (fname, kpse_tfm_format, 0); 
        break;
      case mp_filetype_fontmap: 
        s = kpse_find_file (fname, kpse_fontmap_format, 0); 
        break;
      case mp_filetype_font: 
        s = kpse_find_file (fname, kpse_type1_format, 0); 
        break;
      case mp_filetype_encoding: 
        s = kpse_find_file (fname, kpse_enc_format, 0); 
        break;
      }
    }
  } else {
    if (fname!=NULL)
      s = mpost_xstrdup(fname); /* when writing */
  }
  return s;
}

@  @<Register the callback routines@>=
if (!nokpse)
  options->find_file = mpost_find_file;

@ The |mpost| program supports setting of internal values
via a |-s| commandline switch. Since this switch is repeatable,
a structure is needed to store the found values in, which is a
simple linked list. 

@c
typedef struct set_list_item {
   int isstring;
   char *name;
   char *value;
   struct set_list_item *next;
} set_list_item ;

@ Here is the global value that is the head of the list of |-s| options.
@c
struct set_list_item *set_list = NULL;

@ And |internal_set_option| is the routine that fills in the linked 
list. The argument it receives starts at the first letter of the
internal, and should contain an internal name, an equals sign,
and the value (possibly in quotes) without any intervening spaces.

Double quotes around the right hand side are needed to make sure that 
the right hand side is treated as a string assignment by MPlib later. 
These outer double quote characters are stripped, but no other string 
processing takes place. 

As a special hidden feature, a missing right hand side is treated as if it
was the integer value |1|. 

@c
void internal_set_option(const char *opt) {
   struct set_list_item *itm;
   char *s, *v;
   int isstring = 0;
   s = mpost_xstrdup(opt) ;
   v = strstr(s,"=") ;
   if (v==NULL) {
     v="1";
   } else {
     *v='\0'; /* terminates |s| */
     v++;
     if (*v && *v=='"') { 
       isstring=1;
       v++;
       *(v+strlen(v)-1)= '\0';
     }
   }
   if (s && v && strlen(s)>0) {
     if (set_list == NULL) {
       set_list = xmalloc(sizeof(struct set_list_item));
       itm = set_list;
     } else {
       itm = set_list;
       while (itm->next != NULL)
         itm = itm->next;
       itm->next = xmalloc(sizeof(struct set_list_item));
       itm = itm->next;
     }
     itm->name = s;
     itm->value = v;
     itm->isstring = isstring;
     itm->next = NULL;
   }
}

@ After the initialization stage is done, the next function
runs thourgh the list of options and feeds them to the MPlib
function |mp_set_internal|.

@c
void run_set_list (MP mp) {
  struct set_list_item *itm;
  itm = set_list;
  while (itm!=NULL) {
    mp_set_internal(mp,itm->name,itm->value, itm->isstring);
    itm = itm->next;
  }
}
   

@ @c 
static void *mpost_open_file(MP mp, const char *fname, const char *fmode, int ftype)  {
  char realmode[3];
  char *s;
  if (ftype==mp_filetype_terminal) {
    return (fmode[0] == 'r' ? stdin : stdout);
  } else if (ftype==mp_filetype_error) {
    return stderr;
  } else { 
    s = mpost_find_file (mp, fname, fmode, ftype);
    if (s!=NULL) {
      void *ret = NULL;
      realmode[0] = *fmode;
	  realmode[1] = 'b';
	  realmode[2] = '\0';
      ret = (void *)fopen(s,realmode);
      if (recorder_enabled) {
        if (!recorder_file)
            recorder_start(job_name);
        if (*fmode == 'r')
          fprintf(recorder_file, "INPUT %s\n", s);
        else
          fprintf(recorder_file, "OUTPUT %s\n", s);
      }
      free(s);
      return ret;
    }
  }
  return NULL;
}

@  @<Register the callback routines@>=
if (!nokpse)
  options->open_file = mpost_open_file;


@ Parsing the commandline options.

@d option_is(A) ((strncmp(argv[a],"--" A, strlen(A)+2)==0) || 
       (strncmp(argv[a],"-" A, strlen(A)+1)==0))
@d option_arg(B) (mpost_optarg != NULL && strncmp(mpost_optarg,B, strlen(B))==0)


@<Read and set command line options@>=
{
  char *mpost_optarg;
  boolean ini_version_test = false;
  while (++a<argc) {
    mpost_optarg = strstr(argv[a],"=") ;
    if (mpost_optarg!=NULL) {
      mpost_optarg++;
      if (*mpost_optarg == '\0')  mpost_optarg=NULL;
    }
    if (option_is("ini")) {
      ini_version_test = true;
    } else if (option_is("s")) {
	char *s_head = argv[a]; 
        while (*s_head!='s') s_head++;
        s_head++;
        if (!*s_head) {
	  if (((a+1)<argc) && (*(argv[(a+1)])!='-')) {
            internal_set_option(argv[++a]);
          } else {
            fprintf(stdout,"fatal error: %s: missing -s argument\n", argv[0]);
            exit(EXIT_FAILURE);
          }
        } else {
          internal_set_option(s_head);
        }
    } else if (option_is("debug")) {
      debug = 1;
    } else if (option_is ("kpathsea-debug")) {
      if (mpost_optarg!=NULL)
        kpathsea_debug |= atoi (mpost_optarg);
    } else if (option_is("mem")) {
      if (mpost_optarg!=NULL) {
        mpost_xfree(options->mem_name);
        options->mem_name = mpost_xstrdup(mpost_optarg);
        if (user_progname == NULL) 
	    user_progname = mpost_optarg;
      }
    } else if (option_is("jobname")) {
      if (mpost_optarg!=NULL) {
        mpost_xfree(options->job_name);
        options->job_name = mpost_xstrdup(mpost_optarg);
      }
    } else if (option_is ("progname")) {
      user_progname = mpost_optarg;
    } else if (option_is("troff") || option_is("T")) {
      options->troff_mode = (int)true;
    } else if (option_is("recorder")) {
      recorder_enabled = true;
    } else if (option_is ("tex")) {
      mpost_tex_program = mpost_optarg;
    } else if (option_is("interaction")) {
      if (option_arg("batchmode")) {
        options->interaction = mp_batch_mode;
      } else if (option_arg("nonstopmode")) {
        options->interaction = mp_nonstop_mode;
      } else if (option_arg("scrollmode")) {
        options->interaction = mp_scroll_mode;
      } else if (option_arg("errorstopmode")) {
        options->interaction = mp_error_stop_mode;
      } else {
        fprintf(stdout,"warning: %s: unknown option argument %s\n", argv[0], argv[a]);
      }
    } else if (option_is("no-kpathsea")) {
      nokpse=true;
    } else if (option_is("file-line-error")) {
      options->file_line_error_style=true;
    } else if (option_is("no-file-line-error")) {
      options->file_line_error_style=false;
    } else if (option_is("dvitomp")) {
      dvitomp_only = 1;
    } else if (option_is("help")) {
      if (dvitomp_only) {
        @<Show short help and exit@>;
      } else {
        @<Show help and exit@>;
      }
    } else if (option_is("version")) {
      @<Show version and exit@>;
    } else if (option_is("8bit") ||
               option_is("parse-first-line")) {
      /* do nothing, these are always on */
    } else if (option_is("halt-on-error")) {
	options->halt_on_error = true;
    } else if (option_is("translate-file") ||
               option_is("output-directory") ||
               option_is("no-parse-first-line")) {
      fprintf(stdout,"warning: %s: unimplemented option %s\n", argv[0], argv[a]);
    } else if (option_is("")) {
      fprintf(stdout,"fatal error: %s: unknown option %s\n", argv[0], argv[a]);
      exit(EXIT_FAILURE);
    } else {
      break;
    }
  }
  options->ini_version = (int)ini_version_test;
}

@ 
@<Read and set dvitomp command line options@>=
{
  char *mpost_optarg;
  boolean ini_version_test = false;
  while (++a<argc) {
    mpost_optarg = strstr(argv[a],"=") ;
    if (mpost_optarg!=NULL) {
      mpost_optarg++;
      if (*mpost_optarg == '\0')  mpost_optarg=NULL;
    }
    if (option_is("debug")) {
      debug = 1;
    } else if (option_is ("kpathsea-debug")) {
      if (mpost_optarg!=NULL)
        kpathsea_debug |= atoi (mpost_optarg);
    } else if (option_is ("progname")) {
      user_progname = mpost_optarg;
    } else if (option_is("no-kpathsea")) {
      nokpse=true;
    } else if (option_is("help")) {
      @<Show short help and exit@>;
    } else if (option_is("version")) {
      @<Show version and exit@>;
    } else if (option_is("")) {
      fprintf(stdout,"fatal error: %s: unknown option %s\n", argv[0], argv[a]);
      exit(EXIT_FAILURE);
    } else {
      break;
    }
  }
  options->ini_version = (int)ini_version_test;
}

@ 
@<Show help...@>=
{
fprintf(stdout,
"\n"
"Usage: mpost [OPTION] [&MEMNAME] [MPNAME[.mp]] [COMMANDS]\n"
"       mpost --dvitomp DVINAME[.dvi] [MPXNAME[.mpx]]\n"
"\n"
"  Run MetaPost on MPNAME, usually creating MPNAME.NNN (and perhaps\n"
"  MPNAME.tfm), where NNN are the character numbers generated.\n"
"  Any remaining COMMANDS are processed as MetaPost input,\n"
"  after MPNAME is read.\n\n"
"  With a --dvitomp argument, MetaPost acts as DVI-to-MPX converter only.\n"
"  Call MetaPost with --dvitomp --help for option explanations.\n\n");
fprintf(stdout,
"  -ini                      be inimpost, for dumping mem files\n"
"  -interaction=STRING       set interaction mode (STRING=batchmode/nonstopmode/\n"
"                            scrollmode/errorstopmode)\n"
"  -jobname=STRING           set the job name to STRING\n"
"  -progname=STRING          set program (and mem) name to STRING\n"
"  -tex=TEXPROGRAM           use TEXPROGRAM for text labels\n"
"  [-no]-file-line-error     disable/enable file:line:error style messages\n"
);
fprintf(stdout,
"  -kpathsea-debug=NUMBER    set path searching debugging flags according to\n"
"                            the bits of NUMBER\n"
"  -mem=MEMNAME or &MEMNAME  use MEMNAME instead of program name or a %%& line\n"
"  -recorder                 enable filename recorder\n"
"  -troff                    set prologues:=1 and assume TEXPROGRAM is really troff\n"
"  -sINTERNAL=\"STRING\"       set internal INTERNAL to the string value STRING\n"
"  -sINTERNAL=NUMBER         set internal INTERNAL to the integer value NUMBER\n"
"  -help                     display this help and exit\n"
"  -version                  output version information and exit\n"
"\n"
"Email bug reports to mp-implementors@@tug.org.\n"
"\n");
  exit(EXIT_SUCCESS);
}

@ 
@<Show short help...@>=
{
fprintf(stdout,
"\n"
"Usage: dvitomp DVINAME[.dvi] [MPXNAME[.mpx]]\n"
"       mpost --dvitomp DVINAME[.dvi] [MPXNAME[.mpx]]\n"
"\n"
"  Convert a TeX DVI file to a MetaPost MPX file.\n\n");
fprintf(stdout,
"  -progname=STRING          set program name to STRING\n"
"  -kpathsea-debug=NUMBER    set path searching debugging flags according to\n"
"                            the bits of NUMBER\n"
"  -help                     display this help and exit\n"
"  -version                  output version information and exit\n"
"\n"
"Email bug reports to mp-implementors@@tug.org.\n"
"\n");
  exit(EXIT_SUCCESS);
}

@ 
@<Show version...@>=
{
  char *s = mp_metapost_version();
if (dvitomp_only)
  fprintf(stdout, "\n" "dvitomp %s\n", s);
else
  fprintf(stdout, "\n" "MetaPost %s\n", s);
fprintf(stdout, 
"Copyright 2009 AT&T Bell Laboratories.\n"
"There is NO warranty.  Redistribution of this software is\n"
"covered by the terms of both the MetaPost copyright and\n"
"the Lesser GNU Lesser General Public License.\n"
"For more information about these matters, see the files\n"
"named COPYING, COPYING.LESSER and the MetaPost source.\n"
"Primary author of MetaPost: John Hobby.\n"
"Current maintainer of MetaPost: Taco Hoekwater.\n"
"\n");
  mpost_xfree(s);
  exit(EXIT_SUCCESS);
}

@ The final part of the command line, after option processing, is
stored in the \MP\ instance, this will be taken as the first line of
input.

@d command_line_size 256

@<Copy the rest of the command line@>=
{
  mpost_xfree(options->command_line);
  options->command_line = mpost_xmalloc(command_line_size);
  strcpy(options->command_line,"");
  if (a<argc) {
    k=0;
    for(;a<argc;a++) {
      char *c = argv[a];
      while (*c != '\0') {
	    if (k<(command_line_size-1)) {
          options->command_line[k++] = *c;
        }
        c++;
      }
      options->command_line[k++] = ' ';
    }
	while (k>0) {
      if (options->command_line[(k-1)] == ' ') 
        k--; 
      else 
        break;
    }
    options->command_line[k] = '\0';
  }
}

@ A simple function to get numerical |texmf.cnf| values
@c
static int setup_var (int def, const char *var_name, boolean nokpse) {
  if (!nokpse) {
    char * expansion = kpse_var_value (var_name);
    if (expansion) {
      int conf_val = atoi (expansion);
      free (expansion);
      if (conf_val > 0) {
        return conf_val;
      }
    }
  }
  return def;
}

@ @<Set up the banner line@>=
{
  char * mpversion = mp_metapost_version () ;
  const char * banner = "This is MetaPost, version ";
  const char * kpsebanner_start = " (";
  const char * kpsebanner_stop = ")";
  mpost_xfree(options->banner);
  options->banner = mpost_xmalloc(strlen(banner)+
                            strlen(mpversion)+
                            strlen(kpsebanner_start)+
                            strlen(kpathsea_version_string)+
                            strlen(kpsebanner_stop)+1);
  strcpy (options->banner, banner);
  strcat (options->banner, mpversion);
  strcat (options->banner, kpsebanner_start);
  strcat (options->banner, kpathsea_version_string);
  strcat (options->banner, kpsebanner_stop);
  mpost_xfree(mpversion);
}

@ Precedence order is:

\item {} \.{-mem=MEMNAME} on the command line 
\item {} \.{\&MEMNAME} on the command line 
\item {} \.{\%\&MEM} as first line inside input file
\item {} \.{argv[0]} if all else fails

@<Discover the mem name@>=
{
  char *m = NULL; /* head of potential |mem_name| */
  char *n = NULL; /* a moving pointer */
  if (options->command_line != NULL && *(options->command_line) == '&'){
    m = mpost_xstrdup(options->command_line+1);
    n = m;
    while (*n != '\0' && *n != ' ') n++;
    while (*n == ' ') n++;
    if (*n != '\0') { /* more command line to follow */
      char *s = mpost_xstrdup(n);
      if (n>m) n--;
      while (*n == ' ' && n>m) n--;
      n++;
      *n ='\0'; /* this terminates |m| */
      mpost_xfree(options->command_line);
      options->command_line = s;
    } else { /* only \.{\&MEMNAME} on command line */
      if (n>m) n--;
      while (*n == ' ' && n>m) n--;
      n++;
      *n ='\0'; /* this terminates |m| */
      mpost_xfree(options->command_line);
    }
    if ( options->mem_name == NULL && *m != '\0') {
      mpost_xfree(options->mem_name); /* for lint only */
      options->mem_name = m;
    } else {
      mpost_xfree(m);
    }
  }
}
if ( options->mem_name == NULL ) {
  char *m = NULL; /* head of potential |job_name| */
  char *n = NULL; /* a moving pointer */
  if (options->command_line != NULL && *(options->command_line) != '\\'){
    m = mpost_xstrdup(options->command_line);
    n = m;
    while (*n != '\0' && *n != ' ') n++;
    if (n>m) {
      char *fname;
      *n='\0';
      fname = m;
      if (!nokpse)
        fname = kpse_find_file(m,kpse_mp_format,true);
      if (fname == NULL) {
        mpost_xfree(m);
      } else {
        FILE *F = fopen(fname,"r");
        if (F==NULL) {
          mpost_xfree(fname);
        } else {
          char *line = mpost_xmalloc(256);
          if (fgets(line,255,F) == NULL) {
            (void)fclose(F);
            mpost_xfree(fname);
            mpost_xfree(line);
          } else {
            (void)fclose(F);
            while (*line != '\0' && *line == ' ') line++;
            if (*line == '%') {
              n = m = line+1;
              while (*n != '\0' && *n == ' ') n++;
              if (*n == '&') {
                m = n+1;
                while (*n != '\0' && *n != ' ') n++;
                if (n>(m+1)) {
                  n--;
                  while (*n == ' ' && n>m) n--;
                  *n ='\0'; /* this terminates |m| */
                  options->mem_name = mpost_xstrdup(m);
                  mpost_xfree(fname);
                } else {
                  mpost_xfree(fname);
                  mpost_xfree(line);    
                }
              }
            }
          }
        }
      }
    } else {
      mpost_xfree(m);
    }
  }
}
if ( options->mem_name == NULL )
  if (kpse_program_name!=NULL)
    options->mem_name = mpost_xstrdup(kpse_program_name);


@ The job name needs to be known for the recorder to work,
so we have to fix up |job_name| and |job_area|. If there 
was a \.{--jobname} on the command line, we have to reset
the options structure as well.

@d IS_DIR_SEP(c) (c=='/' || c=='\\')

@<Discover the job name@>=
{ 
char *tmp_job = NULL;
if (options->job_name != NULL) {
  tmp_job = mpost_xstrdup(options->job_name);
  mpost_xfree(options->job_name);
  options->job_name = NULL;
} else {
  char *m = NULL; /* head of potential |job_name| */
  char *n = NULL; /* a moving pointer */
  if (options->command_line != NULL){
    m = mpost_xstrdup(options->command_line);
    n = m;
    if (*(options->command_line) != '\\') { /* this is the simple case */
      while (*n != '\0' && *n != ' ') n++;
      if (n>m) {
        *n='\0';
        tmp_job = mpost_xstrdup(m);
      }
    } else { /* this is still not perfect, but better */
      char *mm =  strstr(m,"input ");
      if (mm != NULL) {
         mm += 6;
         n = mm;
         while (*n != '\0' && *n != ' ' && *n!=';') n++;
         if (n>mm) {
           *n='\0';
           tmp_job = mpost_xstrdup(mm);
        }
      }
    }
    free(m);
  }
  if (tmp_job == NULL) {
    if (options->ini_version == 1 &&
        options->mem_name != NULL) {
      tmp_job = mpost_xstrdup(options->mem_name);
    }
  }
  if (tmp_job == NULL) {
    tmp_job = mpost_xstrdup("mpout");
  } else {
    size_t i = strlen(tmp_job);
    if (i>3
        && *(tmp_job+i-3)=='.' 
        && *(tmp_job+i-2)=='m' 
        && *(tmp_job+i-1)=='p')
    *(tmp_job+i-3)='\0';
  }
}
/* now split |tmp_job| into |job_area| and |job_name| */
{
  char *s = tmp_job + strlen(tmp_job);
  if (!IS_DIR_SEP(*s)) { /* just in case */
    while (s>tmp_job) {
      if (IS_DIR_SEP(*s)) {
        break;
      }
      s--;
    }
    if (s>tmp_job) {
      /* there was a directory part */
      if (strlen(s)>1) {
        job_name = mpost_xstrdup((s+1));
        *(s+1) = '\0';
        job_area = tmp_job;
      }
    } else {
      job_name = tmp_job;
      /* |job_area| stays NULL */
    }
  }
}
}
options->job_name = job_name;


@ Now this is really it: \MP\ starts and ends here.

@c 
int main (int argc, char **argv) { /* |start_here| */
  int k; /* index into buffer */
  int history; /* the exit status */
  MP mp; /* a metapost instance */
  struct MP_options * options; /* instance options */
  int a=0; /* argc counter */
  boolean nokpse = false; /* switch to {\it not} enable kpse */
  char *user_progname = NULL; /* If the user overrides |argv[0]| with {\tt -progname}.  */
  options = mp_options();
  options->ini_version       = (int)false;
  options->print_found_names = (int)true;
  if (strstr(argv[0], "dvitomp") != NULL) {
    dvitomp_only=1;
    @<Read and set dvitomp command line options@>;
  } else {
    @<Read and set command line options@>;
  }
  if (dvitomp_only) {
    char *mpx = NULL, *dvi = NULL;
    if (a==argc) {
      /* error ? */
    } else {
      dvi = argv[a++];
      if (a<argc) {
        mpx = argv[a++];
      }
    }
    if (dvi == NULL) {
      @<Show short help and exit@>;
    } else {
      if (!nokpse)
        kpse_set_program_name("dvitomp", user_progname);  
      exit (mpost_run_dvitomp(dvi, mpx));
    }
  }

  @= /*@@-nullpass@@*/ @> 
  if (!nokpse) {
    kpse_set_program_enabled (kpse_mem_format, MAKE_TEX_FMT_BY_DEFAULT,
                              kpse_src_compile);
    kpse_set_program_name(argv[0], user_progname);  
  }
  @= /*@@=nullpass@@*/ @> 
  if(putenv((char *)"engine=metapost"))
    fprintf(stdout,"warning: could not set up $engine\n");
  options->main_memory       = setup_var (50000,"main_memory",nokpse);
  options->hash_size         = (unsigned)setup_var (16384,"hash_size",nokpse);
  options->max_in_open       = setup_var (25,"max_in_open",nokpse);
  options->param_size        = setup_var (1500,"param_size",nokpse);
  options->error_line        = setup_var (79,"error_line",nokpse);
  options->half_error_line   = setup_var (50,"half_error_line",nokpse);
  options->max_print_line    = setup_var (100,"max_print_line",nokpse);
  @<Set up the banner line@>;
  @<Copy the rest of the command line@>;
  if (options->ini_version!=(int)true) {
    @<Discover the mem name@>;
  }
  @<Discover the job name@>;
  @<Register the callback routines@>;
  mp = mp_initialize(options);
  mpost_xfree(options->command_line);
  mpost_xfree(options->mem_name);
  mpost_xfree(options->job_name);
  mpost_xfree(options->banner);
  free(options);
  if (mp==NULL)
	exit(EXIT_FAILURE);
  history = mp_status(mp);
  if (history!=0)
	exit(history);
  if (set_list!=NULL) {
    run_set_list(mp);
  }
  history = mp_run(mp);
  (void)mp_finish(mp);
  exit(history);
}