/*
 * Copyright 1995-1998 by Devin Reade <gdr@trenco.gno.org>. For distribution
 * information see the README file that is part of the manpack archive,
 * or contact the author, above.
 *
 * $Id: process.c,v 1.4 1998/03/29 07:16:17 gdr-ftp Exp $
 */

#ifdef __ORCAC__
segment "makewhatis";
#pragma noroot
#endif

#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <stdlib.h>
#include <gsos.h>
#include <orca.h>
#include <gno/contrib.h>
#include "man.h"

/* These are the compression types */
#define NO_COMPRESS 0
#define  Z_COMPRESS 1
#define  F_COMPRESS 2
#define  G_COMPRESS 3

#ifdef TEST_PROCESS
   short v_flag    = 1;
   FILE *output_fp;
   FILE *error_fp;
#else
   extern FILE *output_fp;
   extern FILE *error_fp;
#endif

extern GSString255Ptr   __C2GSMALLOC (char *s);
extern char buffer[];
extern char titlebuf[];

/*
 * void process (char *filename, char *tmp_file, FILE *whatis_fp);
 *
 * Pre:  <filename> is the name of the file to add to the database.
 *       <tmp_file> is the name for the temporary file.  It has not been opened.
 *       <whatis_fp> is a file pointer to the open whatis database file.
 *       (sec> is the section "number".  We really only care if it is
 *           either "l" or "local" (because of aroff "links"), otherwise
 *           it is ignored.
 *
 * Post: The name, section number, and description from the man page is
 *       appended to <whatis_fp>.
 */

void process (char *filename, char *tmp_file, FILE *whatis_fp, char *sec) {

   FileInfoRecGS info_record;    /* used to get the file type */
   char *suffix;                 /* points to the start of the file suffix */
   static char command_buf[255]; /* used to call system(2) */
   char *p1;                     /* a scratch pointer */
   int namelength;               /* length of 'name (section)' */
   char *name;                   /* points to the file basename */
   short compression;            /* the compression type (if nec) */

   if (v_flag>=2) {
      fprintf(output_fp,"Working on sec %s file %s ...\n", sec, filename);
   }

   /*
    * get the file basename
    */

   if ((name = malloc (strlen(filename)+1)) == NULL) {
      if (v_flag)
         fprintf(error_fp,"malloc failed when processing %s -- file skipped\n",
            filename);
      return;
   }
   strcpy(name,filename);

   /*
    * check for a compression suffix like ".Z" or ".F"
    */

   p1 = name + strlen(name) -1;        /* p1 points to last char of name */
   while ((p1>=name) && (*p1!='.')) p1--;
   if (p1<=name) { /* <= because we don't want a name beginning with '.' */
      if (v_flag)
         fprintf(error_fp,"%s has no suffix -- file skipped\n",
            filename);
      return;
   }
   if (strcmp(p1,".Z")==0) {
      compression = Z_COMPRESS;
   } else if (strcmp(p1,".F")==0) {
      compression = F_COMPRESS;
   } else if (strcmp(p1,".gz")==0) {
      compression = G_COMPRESS;
   } else compression = NO_COMPRESS;
   *p1 = '\0';

   /*
    * define the suffix
    */

   if (compression == NO_COMPRESS) {
      suffix = p1 + 1;
   } else {
      while ((p1>=name) && (*p1!='.')) --p1;
      if (p1<=name) { /* <= because we don't want a name beginning with '.' */
         if (v_flag)
            fprintf(error_fp,"%s has deformed file name -- file skipped\n",
               filename);
         return;
      }
      *p1 = '\0';
      suffix = p1 + 1;
   }

   /*
    * find out the file type
    */

   if (compression == NO_COMPRESS) {
      info_record.pCount = 5;
      info_record.pathname = __C2GSMALLOC(filename);
      GetFileInfoGS(&info_record);
      if (toolerror()) {
         if (v_flag)
            fprintf(error_fp,
               "malloc failed when processing %s -- file skipped\n", filename);
         return;
      }
   }

   /*
    * Process the file according to type: nroff, aroff, freeze, and compress.
    * The digested result is placed in buffer.
    */

   if ((compression == NO_COMPRESS) &&
       (info_record.fileType == 0x50u) &&
       (info_record.auxType == 0x8010u)
      ) {
      
      /* is it an Appleworks GS word processor document?  Use aroff */
      sprintf(command_buf,"aroff -b %s > %s",filename,tmp_file);
      if (v_flag>=3) fprintf(stderr,"%s\n",command_buf);
      system(command_buf);
      fillbuffer(tmp_file);

   } else if (compression == Z_COMPRESS) {
   
      /* Compressed man page; uncompress it */
      sprintf(command_buf,"compress -cd %s > %s",filename,tmp_file);
      if (v_flag>=3) fprintf(stderr,"%s\n",command_buf);
      system(command_buf);                              
      fillbuffer(tmp_file);

   } else if (compression == F_COMPRESS) {
   
      /* Frozen man page; melt it */
      sprintf(command_buf,"freeze -cd %s > %s",filename,tmp_file);
      if (v_flag>=3) fprintf(stderr,"%s\n",command_buf);
      system(command_buf);                              
      fillbuffer(tmp_file);

   } else if (compression == G_COMPRESS) {
   
      /* gzipped man page; zcat it */
      sprintf(command_buf,"gzip -cd %s > %s",filename,tmp_file);
      if (v_flag>=3) fprintf(stderr,"%s\n",command_buf);
      system(command_buf);                              
      fillbuffer(tmp_file);

   } else if ((*suffix=='l') && (*(suffix+1)=='\0') &&
              strcmp("l",sec) && strcmp("local",sec)) {
   
      /* It's a link to another man page; do nothing. */
      return;

   } else {

      /* Assume that it's a text file */
      if (v_flag>=3) fprintf(stderr,"assuming text file\n");
      fillbuffer(filename);                             
   }

   /*
    * If there was an error, or it is an .so reference to another man
    * page, then return without writing anything to the database
    */

   if ((buffer[0] == '\0') || (titlebuf[0] == '\0')) {
      return;
   }

   /*
    * At this point, buffer contains the line that we need to print to
    * whatis_fd.  Strip off any leading spaces, then give it a nice
    * formatting.
    */

   p1 = buffer;
   while (isspace(*p1)) p1++; 
   namelength = strlen(titlebuf) + strlen(suffix) + 4;

   if (namelength > (TABLENGTH * 3)) {
      fprintf(whatis_fp,"%s (%s) - %s\n", titlebuf, suffix, p1);
   } else if (namelength > (TABLENGTH * 2)) {
      fprintf(whatis_fp,"%s (%s)\t- %s\n", titlebuf, suffix, p1);
   } else if (namelength > TABLENGTH ) {
      fprintf(whatis_fp,"%s (%s)\t\t- %s\n", titlebuf, suffix, p1);
   } else {                               
      fprintf(whatis_fp,"%s (%s)\t\t\t- %s\n", titlebuf, suffix, p1);
   }

   return;
}


#ifdef TEST_PROCESS

int main (int argc, char **argv) {
   
   output_fp = stdout;
   error_fp  = stderr;

   if (argc != 2) {
      fprintf(stderr,"Usage: %s <man_page_file_name>\n",argv[0]);
      return -1;
   }

   process (argv[1], ":tmp:garbage", stdout, "2");

   return 0;
}

#endif