// Space Replace
// Copyright 2002 © Robert Wallis
// http://www.codetriangle.com
//
// The purpose of this program is to rename
//  windows files that have spaces with more
//  unix compatable files

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifndef bool
#define false 0
#define true 1
#ifndef boolean
typedef char bool;
#else
typedef boolean bool;
#endif
#endif

void usage()
  {
  printf("Space Replace\nCopyright (C) 2002 Robert Wallis\nhttp:\\\\codetriangle.com\n");
  printf("usage: sr [-r='_'] [-s=' '] filename\n");
  printf("  REPLACE CHARACTER\n");
  printf("  -s=' '\n");                                                                   //
  printf("    Source Character: the ' ' (space) character can be replaced with a source\n");
  printf("    character of your choice.  \' \' is the default source character\n");
  printf("  -r='_'\n");
  printf("    Destination Character: the _ (underscore) character can be replaced with a\n");
  printf("    character of your choice.  _ is the default replaced character\n");
  printf("\n");
  printf("  EXAMPLES\n");
  printf("  sr \"Various Artists\"*.mp3\n");
  printf("    renames all files that start with \"Various Artists\" and end\n");
  printf("    with \".mp3\", Various_Artists*.mp3\n\n");
  printf("  sr -r='Z' -s='T' bar.Test\n");
  printf("    renames \"bar.Test\" \"bar.Zest\"\n\n");
  printf("  sr -s='T' -r='Z' bar.Test\n");
  printf("    renames \"bar.Test\" \"bar.Zest\"\n\n");
  printf("  sr *\n");
  printf("    renames all files (in the current directory) with spaces, to files with\n");
  printf("    underscores\n");

  exit(1);
  }

int main(int argc, char* argv[])
  {
  int i;              // loop through argv variable
  int j;              // loop inside string variable
  int offset;         // which argv starts the list of files
  char* temp;         // temporary filename
  char replace_char;  // replace source_char with this character
  char source_char;   // character to replace replace_char
  bool changes;       // are there any changes in the filename?

  // no args = show usage
  // usage() has to be down here because of the 6 instruction EE bug
  if (argc == 1)
    {
	usage();
    }

  // set defaults
  replace_char='_';
  source_char=' ';
  temp=0;
  i=0;
  j=0;
  offset=1;           // the 0th argument is the program name
  changes=false;

  // program argument
  for (i=1; i<argc; i=i+1)
    {
    if (argv[i][0]=='-')
      {
      // 012345   - character numbers
      // -r='_'   - example string
      if (strlen(argv[i])==6)
        {
        // check for alternate replace character  -r
        if (argv[i][1]=='r' || argv[i][1]=='R')
          {
          replace_char=argv[i][4];
          }
        // check for alternate source character  -s
        else if (argv[i][1]=='s' || argv[i][1]=='S')
          {
          source_char=argv[i][4];
          }
        else
          {
          usage();
          }
        }
      // if the source character is a ' ' character then it will take 2 argv statements
      else if (strlen(argv[i])==4 && argc>i+1)
        {
        // check for alternate replace character  -r
        if (argv[i][1]=='r' || argv[i][1]=='R')
          {
          replace_char=' ';
          i = i + 1; // make sure we use up the next argv
          }
        // check for alternate source character  -s
        else if (argv[i][1]=='s' || argv[i][1]=='S')
          {
          source_char=' ';
          i = i + 1; // make sure we use up the next argv
          }
        else
          {
          usage();
          }
        }
      else
        {
        usage();
        }
      // this ^ is a program argument not a filename
      offset = i + 1;
      }
    else
      {
      break;
      }
    }

  // replace the filenames
  for (i=offset; i<argc; i=i+1)
    {
    changes=false;
    temp = malloc(strlen(argv[i])+1);
    strcpy(temp, argv[i]);
    // search each character for a space and replace
    for (j=0; j<strlen(temp); j=j+1)
      {
      if (temp[j] == source_char)
        {
        temp[j]=replace_char;
        changes=true;
        }
      }
    // rename the old file the new non-space name
    if (changes)
      {
      rename(argv[i], temp);
      }
    free(temp);
    temp=0;
    }
  exit(0);
  }