**
** This file contains code used to implement the "diff" command
*/
#include "config.h"
#include "diffcmd.h"
#include <assert.h>

/*
** Output the results of a diff.  Output goes to stdout for command-line
** or to the CGI/HTTP result buffer for web pages.
*/
static void diff_printf(const char *zFormat, ...){
  va_list ap;
  va_start(ap, zFormat);
  if( g.cgiOutput ){
    cgi_vprintf(zFormat, ap);
  }else{
    vprintf(zFormat, ap);
  }
  va_end(ap);
}

/*
** Print the "Index:" message that patches wants to see at the top of a diff.
*/
void diff_print_index(const char *zFile, int diffFlags){
  if( (diffFlags & DIFF_SIDEBYSIDE)==0 ){
    char *z = mprintf("Index: %s\n%.66c\n", zFile, '=');
    diff_printf("%s", z);
    fossil_free(z);
  }
}

/*
** Print the +++/--- filename lines for a diff operation.
*/
void diff_print_filenames(const char *zLeft, const char *zRight, int diffFlags){
  char *z = 0;
  if( diffFlags & DIFF_SIDEBYSIDE ){
    int w = diff_width(diffFlags);
    int n1 = strlen(zLeft);
    int x;
    if( n1>w*2 ) n1 = w*2;
    x = w*2+17 - (n1+2);
    z = mprintf("%.*c %.*s %.*c\n",
                x/2, '=', n1, zLeft, (x+1)/2, '=');
  }else{
    z = mprintf("--- %s\n+++ %s\n", zLeft, zRight);
  }
  diff_printf("%s", z);
  fossil_free(z);
}

/*
** Show the difference between two files, one in memory and one on disk.
**
** The difference is the set of edits needed to transform pFile1 into

    }

    /* Compute and output the differences */
    blob_zero(&out);
    text_diff(pFile1, &file2, &out, diffFlags);
    if( blob_size(&out) ){
      diff_print_filenames(zName, zName2, diffFlags);
      diff_printf("%s\n", blob_str(&out));
    }

    /* Release memory resources */
    blob_reset(&file2);
    blob_reset(&out);
  }else{
    int cnt = 0;

){
  if( zDiffCmd==0 ){
    Blob out;      /* Diff output text */

    blob_zero(&out);
    text_diff(pFile1, pFile2, &out, diffFlags);
    diff_print_filenames(zName, zName, diffFlags);
    diff_printf("%s\n", blob_str(&out));

    /* Release memory resources */
    blob_reset(&out);
  }else{
    Blob cmd;
    char zTemp1[300];
    char zTemp2[300];

){
  Blob fname;
  Blob content;
  int isLink;
  file_tree_name(zFileTreeName, &fname, 1);
  historical_version_of_file(zFrom, blob_str(&fname), &content, &isLink, 0, 0);
  if( !isLink != !file_wd_islink(zFrom) ){
    diff_printf("cannot compute difference between symlink and regular file\n");

  }else{
    diff_file(&content, zFileTreeName, zFileTreeName, zDiffCmd, diffFlags);
  }
  blob_reset(&content);
  blob_reset(&fname);
}

    int isNew = db_column_int(&q,3);
    int srcid = db_column_int(&q, 4);
    int isLink = db_column_int(&q, 5);
    char *zFullName = mprintf("%s%s", g.zLocalRoot, zPathname);
    char *zToFree = zFullName;
    int showDiff = 1;
    if( isDeleted ){
      diff_printf("DELETED  %s\n", zPathname);
      if( !asNewFile ){ showDiff = 0; zFullName = "/dev/null"; }
    }else if( file_access(zFullName, 0) ){
      diff_printf("MISSING  %s\n", zPathname);
      if( !asNewFile ){ showDiff = 0; }
    }else if( isNew ){
      diff_printf("ADDED    %s\n", zPathname);
      srcid = 0;
      if( !asNewFile ){ showDiff = 0; }
    }else if( isChnged==3 ){
      diff_printf("ADDED_BY_MERGE %s\n", zPathname);
      srcid = 0;
      if( !asNewFile ){ showDiff = 0; }
    }
    if( showDiff ){
      Blob content;
      if( !isLink != !file_wd_islink(zFullName) ){
        diff_print_index(zPathname, diffFlags);
        diff_print_filenames(zPathname, zPathname, diffFlags);
        diff_printf("cannot compute difference between symlink and regular file\n");

        continue;
      }
      if( srcid>0 ){
        content_get(srcid, &content);
      }else{
        blob_zero(&content);
      }

  int isLink1, isLink2;
  file_tree_name(zFileTreeName, &fname, 1);
  zName = blob_str(&fname);
  historical_version_of_file(zFrom, zName, &v1, &isLink1, 0, 0);
  historical_version_of_file(zTo, zName, &v2, &isLink2, 0, 0);
  if( isLink1 != isLink2 ){
    diff_print_filenames(zName, zName, diffFlags);

    diff_printf("cannot compute difference between symlink and regular file\n");
  }else{
    diff_file_mem(&v1, &v2, zName, zDiffCmd, diffFlags);
  }
  blob_reset(&v1);
  blob_reset(&v2);
  blob_reset(&fname);
}

      cmp = +1;
    }else if( pToFile==0 ){
      cmp = -1;
    }else{
      cmp = fossil_strcmp(pFromFile->zName, pToFile->zName);
    }
    if( cmp<0 ){
      diff_printf("DELETED %s\n", pFromFile->zName);
      if( asNewFlag ){
        diff_manifest_entry(pFromFile, 0, zDiffCmd, diffFlags);
      }
      pFromFile = manifest_file_next(pFrom,0);
    }else if( cmp>0 ){
      diff_printf("ADDED   %s\n", pToFile->zName);
      if( asNewFlag ){
        diff_manifest_entry(0, pToFile, zDiffCmd, diffFlags);
      }
      pToFile = manifest_file_next(pTo,0);
    }else if( fossil_strcmp(pFromFile->zUuid, pToFile->zUuid)==0 ){
      /* No changes */
      pFromFile = manifest_file_next(pFrom,0);
      pToFile = manifest_file_next(pTo,0);
    }else{
      /* diff_printf("CHANGED %s\n", pFromFile->zName); */
      diff_manifest_entry(pFromFile, pToFile, zDiffCmd, diffFlags);
      pFromFile = manifest_file_next(pFrom,0);
      pToFile = manifest_file_next(pTo,0);
    }
  }
  manifest_destroy(pFrom);
  manifest_destroy(pTo);

  assert( toStdErr==0 || toStdErr==1 );
  if( istty[toStdErr] ) z = zToFree = fossil_utf8_to_console(z);
  fwrite(z, 1, strlen(z), toStdErr ? stderr : stdout);
  free(zToFree);
#else
  fwrite(z, 1, strlen(z), toStdErr ? stderr : stdout);
#endif

}

/*
** Write output for user consumption.  If g.cgiOutput is enabled, then
** send the output as part of the CGI reply.  If g.cgiOutput is false,
** then write on standard output.
*/