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Overview
Comment:Enhance the "fossil diff" command so that it accepts directories as arguments and shows diffs on all files contained within those directories.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1:c46f98055cf49687423e15a134ed1445ff10fbd6
User & Date: drh 2015-12-15 20:07:02
Context
2015-12-15
20:18
Minor fix to the previous "fossil diff" enhancement to avoid unnecessary warnings about directories not being found if the directory does not contain any files that were changed. check-in: b789df4b user: drh tags: trunk
20:07
Enhance the "fossil diff" command so that it accepts directories as arguments and shows diffs on all files contained within those directories. check-in: c46f9805 user: drh tags: trunk
16:12
Add the "bisect" query parameter the /timeline. Add the "fossil bisect ui" command that runs "fossil ui -page 'timeline?bisect'". check-in: cbde2cf7 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/diffcmd.c.

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#define DIFF_NO_NAME  "(unknown)"

/*
** Use the "exec-rel-paths" setting and the --exec-abs-paths and
** --exec-rel-paths command line options to determine whether
** certain external commands are executed using relative paths.
*/
static int determine_exec_relative_option(int force)
{
  static int relativePaths = -1;
  if( force || relativePaths==-1 ){
    int relPathOption = find_option("exec-rel-paths", 0, 0)!=0;
    int absPathOption = find_option("exec-abs-paths", 0, 0)!=0;
#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
    relativePaths = db_get_boolean("exec-rel-paths", 1);
#else
................................................................................
    relativePaths = db_get_boolean("exec-rel-paths", 0);
#endif
    if( relPathOption ){ relativePaths = 1; }
    if( absPathOption ){ relativePaths = 0; }
  }
  return relativePaths;
}



















































/*
** Print the "Index:" message that patches wants to see at the top of a diff.
*/
void diff_print_index(const char *zFile, u64 diffFlags){
  if( (diffFlags & (DIFF_SIDEBYSIDE|DIFF_BRIEF))==0 ){
    char *z = mprintf("Index: %s\n%.66c\n", zFile, '=');
................................................................................
    /* Delete the temporary file and clean up memory used */
    file_delete(zTemp1);
    file_delete(zTemp2);
    blob_reset(&cmd);
  }
}

/*
** Do a diff against a single file named in zFile from version zFrom
** against the same file on disk.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_one_against_disk(
  const char *zFrom,        /* Version tag for the "before" file */
  const char *zDiffCmd,     /* Use this "diff" command */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Include binary files for external diff */
  u64 diffFlags,            /* Diff control flags */
  const char *zFile         /* Name of the file to be diffed */
){
  Blob fname;
  Blob content;
  int isLink;
  int isBin;
  file_tree_name(zFile, &fname, 0, 1);
  historical_version_of_file(zFrom, blob_str(&fname), &content, &isLink, 0,
                             fIncludeBinary ? 0 : &isBin, 0);
  if( !isLink != !file_wd_islink(zFrom) ){
    fossil_print("%s",DIFF_CANNOT_COMPUTE_SYMLINK);
  }else{
    diff_file(&content, isBin, zFile, zFile,
              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&content);
  blob_reset(&fname);
}

/*
** Run a diff between the version zFrom and files on disk.  zFrom might
** be NULL which means to simply show the difference between the edited
** files on disk and the check-out on which they are based.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_all_against_disk(
  const char *zFrom,        /* Version to difference from */
  const char *zDiffCmd,     /* Use this diff command.  NULL for built-in */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Treat file names matching this as binary */
  u64 diffFlags             /* Flags controlling diff output */

){
  int vid;
  Blob sql;
  Stmt q;
  int asNewFile;            /* Treat non-existant files as empty files */

  asNewFile = (diffFlags & DIFF_VERBOSE)!=0;
................................................................................
    int isNew = db_column_int(&q,3);
    int srcid = db_column_int(&q, 4);
    int isLink = db_column_int(&q, 5);
    const char *zFullName;
    int showDiff = 1;
    Blob fname;


    if( determine_exec_relative_option(0) ){
      blob_zero(&fname);
      file_relative_name(zPathname, &fname, 1);
    }else{
      blob_set(&fname, g.zLocalRoot);
      blob_append(&fname, zPathname, -1);
    }
................................................................................
    }
    blob_reset(&fname);
  }
  db_finalize(&q);
  db_end_transaction(1);  /* ROLLBACK */
}

/*
** Do a diff of a single file named in zFile against the
** version of this file held in the undo buffer.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_one_against_undo(
  const char *zDiffCmd,     /* Use this "diff" command */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Include binary files for external diff */
  u64 diffFlags,            /* Diff control flags */
  const char *zFile         /* Name of the file to be diffed */
){
  Blob fname;
  Blob content;

  blob_init(&content, 0, 0);
  file_tree_name(zFile, &fname, 0, 1);
  db_blob(&content, "SELECT content FROM undo WHERE pathname=%Q",
                    blob_str(&fname));
  if( blob_size(&content) ){
    diff_file(&content, 0, zFile, zFile,
              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&content);
  blob_reset(&fname);
}

/*
** Run a diff between the undo buffer and files on disk.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_all_against_undo(
  const char *zDiffCmd,     /* Use this diff command.  NULL for built-in */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Treat file names matching this as binary */
  u64 diffFlags             /* Flags controlling diff output */

){
  Stmt q;
  Blob content;
  db_prepare(&q, "SELECT pathname, content FROM undo");
  blob_init(&content, 0, 0);
  while( db_step(&q)==SQLITE_ROW ){

    const char *zFile = (const char*)db_column_text(&q, 0);

    char *zFullName = mprintf("%s%s", g.zLocalRoot, zFile);
    db_column_blob(&q, 1, &content);
    diff_file(&content, 0, zFullName, zFile,
              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
    fossil_free(zFullName);
    blob_reset(&content);
  }
  db_finalize(&q);
}

/*
** Output the differences between two versions of a single file.
** zFrom and zTo are the check-ins containing the two file versions.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_one_two_versions(
  const char *zFrom,            /* Version tag for the "before" file */
  const char *zTo,              /* Version tag for the "after" file */
  const char *zDiffCmd,         /* Use this "diff" command */
  const char *zBinGlob,         /* GLOB pattern for files that are binary */
  int fIncludeBinary,           /* True to show binary files */
  u64 diffFlags,                /* Diff flags */
  const char *zFile             /* Name of the file to be diffed */
){
  char *zName;
  Blob fname;
  Blob v1, v2;
  int isLink1, isLink2;
  int isBin1, isBin2;
  if( diffFlags & DIFF_BRIEF ) return;
  file_tree_name(zFile, &fname, 0, 1);
  zName = blob_str(&fname);
  historical_version_of_file(zFrom, zName, &v1, &isLink1, 0,
                             fIncludeBinary ? 0 : &isBin1, 0);
  historical_version_of_file(zTo, zName, &v2, &isLink2, 0,
                             fIncludeBinary ? 0 : &isBin2, 0);
  if( isLink1 != isLink2 ){
    diff_print_filenames(zName, zName, diffFlags);
    fossil_print("%s",DIFF_CANNOT_COMPUTE_SYMLINK);
  }else{
    diff_file_mem(&v1, &v2, isBin1, isBin2, zName, zDiffCmd,
                  zBinGlob, fIncludeBinary, diffFlags);
  }
  blob_reset(&v1);
  blob_reset(&v2);
  blob_reset(&fname);
}

/*
** Show the difference between two files identified by ManifestFile
** entries.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
................................................................................
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_all_two_versions(
  const char *zFrom,
  const char *zTo,
  const char *zDiffCmd,
  const char *zBinGlob,
  int fIncludeBinary,
  u64 diffFlags

){
  Manifest *pFrom, *pTo;
  ManifestFile *pFromFile, *pToFile;
  int asNewFlag = (diffFlags & DIFF_VERBOSE)!=0 ? 1 : 0;

  pFrom = manifest_get_by_name(zFrom, 0);
  manifest_file_rewind(pFrom);
................................................................................
      cmp = +1;
    }else if( pToFile==0 ){
      cmp = -1;
    }else{
      cmp = fossil_strcmp(pFromFile->zName, pToFile->zName);
    }
    if( cmp<0 ){

      fossil_print("DELETED %s\n", pFromFile->zName);
      if( asNewFlag ){
        diff_manifest_entry(pFromFile, 0, zDiffCmd, zBinGlob,
                            fIncludeBinary, diffFlags);

      }
      pFromFile = manifest_file_next(pFrom,0);
    }else if( cmp>0 ){

      fossil_print("ADDED   %s\n", pToFile->zName);
      if( asNewFlag ){
        diff_manifest_entry(0, pToFile, zDiffCmd, zBinGlob,
                            fIncludeBinary, 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{

      if( diffFlags & DIFF_BRIEF ){
        fossil_print("CHANGED %s\n", pFromFile->zName);
      }else{
        diff_manifest_entry(pFromFile, pToFile, zDiffCmd, zBinGlob,
                            fIncludeBinary, diffFlags);

      }
      pFromFile = manifest_file_next(pFrom,0);
      pToFile = manifest_file_next(pTo,0);
    }
  }
  manifest_destroy(pFrom);
  manifest_destroy(pTo);
................................................................................
** by the diff subsystem, if any.
*/
const char *diff_get_binary_glob(void){
  const char *zBinGlob = find_option("binary", 0, 1);
  if( zBinGlob==0 ) zBinGlob = db_get("binary-glob",0);
  return zBinGlob;
}












































/*
** COMMAND: diff
** COMMAND: gdiff
**
** Usage: %fossil diff|gdiff ?OPTIONS? ?FILE1? ?FILE2 ...?
**
................................................................................
  const char *zTo;           /* Target version number */
  const char *zBranch;       /* Branch to diff */
  const char *zDiffCmd = 0;  /* External diff command. NULL for internal diff */
  const char *zBinGlob = 0;  /* Treat file names matching this as binary */
  int fIncludeBinary = 0;    /* Include binary files for external diff */
  int againstUndo = 0;       /* Diff against files in the undo buffer */
  u64 diffFlags = 0;         /* Flags to control the DIFF */


  if( find_option("tk",0,0)!=0 ){
    diff_tk("diff", 2);
    return;
  }
  isGDiff = g.argv[1][0]=='g';
  isInternDiff = find_option("internal","i",0)!=0;
................................................................................
  if( !isInternDiff ){
    zDiffCmd = diff_command_external(isGDiff);
  }
  zBinGlob = diff_get_binary_glob();
  fIncludeBinary = diff_include_binary_files();
  determine_exec_relative_option(1);
  verify_all_options();


















  if( againstUndo ){
    if( db_lget_int("undo_available",0)==0 ){
      fossil_print("No undo or redo is available\n");
      return;
    }
    if( g.argc>=3 ){
      int i;
      for(i=2; i<g.argc; i++){
        diff_one_against_undo(zDiffCmd, zBinGlob, fIncludeBinary,
                              diffFlags, g.argv[i]);
      }
    }else{
      diff_all_against_undo(zDiffCmd, zBinGlob, fIncludeBinary,
                            diffFlags);
    }
  }else if( zTo==0 ){
    if( g.argc>=3 ){
      int i;
      for(i=2; i<g.argc; i++){
        diff_one_against_disk(zFrom, zDiffCmd, zBinGlob, fIncludeBinary,
                              diffFlags, g.argv[i]);
      }
    }else{
      diff_all_against_disk(zFrom, zDiffCmd, zBinGlob, fIncludeBinary,
                            diffFlags);
    }
  }else{
    if( g.argc>=3 ){

      int i;
      for(i=2; i<g.argc; i++){
        diff_one_two_versions(zFrom, zTo, zDiffCmd, zBinGlob, fIncludeBinary,
                              diffFlags, g.argv[i]);



      }
    }else{
      diff_all_two_versions(zFrom, zTo, zDiffCmd, zBinGlob, fIncludeBinary,
                            diffFlags);

    }

  }
}

/*
** WEBPAGE: vpatch
** URL: /vpatch?from=FROM&to=TO
**
................................................................................
  const char *zFrom = P("from");
  const char *zTo = P("to");
  login_check_credentials();
  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
  if( zFrom==0 || zTo==0 ) fossil_redirect_home();

  cgi_set_content_type("text/plain");
  diff_all_two_versions(zFrom, zTo, 0, 0, 0, DIFF_VERBOSE);
}







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#define DIFF_NO_NAME  "(unknown)"

/*
** Use the "exec-rel-paths" setting and the --exec-abs-paths and
** --exec-rel-paths command line options to determine whether
** certain external commands are executed using relative paths.
*/
static int determine_exec_relative_option(int force){

  static int relativePaths = -1;
  if( force || relativePaths==-1 ){
    int relPathOption = find_option("exec-rel-paths", 0, 0)!=0;
    int absPathOption = find_option("exec-abs-paths", 0, 0)!=0;
#if defined(FOSSIL_ENABLE_EXEC_REL_PATHS)
    relativePaths = db_get_boolean("exec-rel-paths", 1);
#else
................................................................................
    relativePaths = db_get_boolean("exec-rel-paths", 0);
#endif
    if( relPathOption ){ relativePaths = 1; }
    if( absPathOption ){ relativePaths = 0; }
  }
  return relativePaths;
}

#if INTERFACE
/*
** An array of FileDirList objects describe the files and directories listed
** on the command line of a "diff" command.  Only those objects listed are
** actually diffed.
*/
struct FileDirList {
  int nUsed;       /* Number of times each entry is used */
  int nName;       /* Length of the entry */
  char *zName;     /* Text of the entry */
};
#endif

/*
** Return true if zFile is a file named on the azInclude[] list or is
** a file in a directory named on the azInclude[] list.
**
** if azInclude is NULL, then always include zFile.
*/
static int file_dir_match(FileDirList *p, const char *zFile){
  int i = 0;
  if( p==0 || strcmp(p->zName,".")==0 ) return 1;
  if( filenames_are_case_sensitive() ){
    while( p->zName ){
      if( strcmp(zFile, p->zName)==0
       || (strncmp(zFile, p->zName, p->nName)==0
           && zFile[p->nName]=='/')
      ){
        break;
      }
      p++;
    }
  }else{
    while( p->zName ){
      if( fossil_stricmp(zFile, p->zName)==0
       || (fossil_strnicmp(zFile, p->zName, p->nName)==0
           && zFile[p->nName]=='/')
      ){
        break;
      }
      p++;
    }
  }
  if( p->zName ){
    p->nUsed++;
    return 1;
  }
  return 0;
}

/*
** Print the "Index:" message that patches wants to see at the top of a diff.
*/
void diff_print_index(const char *zFile, u64 diffFlags){
  if( (diffFlags & (DIFF_SIDEBYSIDE|DIFF_BRIEF))==0 ){
    char *z = mprintf("Index: %s\n%.66c\n", zFile, '=');
................................................................................
    /* Delete the temporary file and clean up memory used */
    file_delete(zTemp1);
    file_delete(zTemp2);
    blob_reset(&cmd);
  }
}





































/*
** Run a diff between the version zFrom and files on disk.  zFrom might
** be NULL which means to simply show the difference between the edited
** files on disk and the check-out on which they are based.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_against_disk(
  const char *zFrom,        /* Version to difference from */
  const char *zDiffCmd,     /* Use this diff command.  NULL for built-in */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Treat file names matching this as binary */
  u64 diffFlags,            /* Flags controlling diff output */
  FileDirList *pFileDir     /* Which files to diff */
){
  int vid;
  Blob sql;
  Stmt q;
  int asNewFile;            /* Treat non-existant files as empty files */

  asNewFile = (diffFlags & DIFF_VERBOSE)!=0;
................................................................................
    int isNew = db_column_int(&q,3);
    int srcid = db_column_int(&q, 4);
    int isLink = db_column_int(&q, 5);
    const char *zFullName;
    int showDiff = 1;
    Blob fname;

    if( !file_dir_match(pFileDir, zPathname) ) continue;
    if( determine_exec_relative_option(0) ){
      blob_zero(&fname);
      file_relative_name(zPathname, &fname, 1);
    }else{
      blob_set(&fname, g.zLocalRoot);
      blob_append(&fname, zPathname, -1);
    }
................................................................................
    }
    blob_reset(&fname);
  }
  db_finalize(&q);
  db_end_transaction(1);  /* ROLLBACK */
}


































/*
** Run a diff between the undo buffer and files on disk.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_against_undo(
  const char *zDiffCmd,     /* Use this diff command.  NULL for built-in */
  const char *zBinGlob,     /* Treat file names matching this as binary */
  int fIncludeBinary,       /* Treat file names matching this as binary */
  u64 diffFlags,            /* Flags controlling diff output */
  FileDirList *pFileDir     /* List of files and directories to diff */
){
  Stmt q;
  Blob content;
  db_prepare(&q, "SELECT pathname, content FROM undo");
  blob_init(&content, 0, 0);
  while( db_step(&q)==SQLITE_ROW ){
    char *zFullName;
    const char *zFile = (const char*)db_column_text(&q, 0);
    if( !file_dir_match(pFileDir, zFile) ) continue;
    zFullName = mprintf("%s%s", g.zLocalRoot, zFile);
    db_column_blob(&q, 1, &content);
    diff_file(&content, 0, zFullName, zFile,
              zDiffCmd, zBinGlob, fIncludeBinary, diffFlags);
    fossil_free(zFullName);
    blob_reset(&content);
  }
  db_finalize(&q);
}













































/*
** Show the difference between two files identified by ManifestFile
** entries.
**
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
................................................................................
** Use the internal diff logic if zDiffCmd is NULL.  Otherwise call the
** command zDiffCmd to do the diffing.
**
** When using an external diff program, zBinGlob contains the GLOB patterns
** for file names to treat as binary.  If fIncludeBinary is zero, these files
** will be skipped in addition to files that may contain binary content.
*/
static void diff_two_versions(
  const char *zFrom,
  const char *zTo,
  const char *zDiffCmd,
  const char *zBinGlob,
  int fIncludeBinary,
  u64 diffFlags,
  FileDirList *pFileDir
){
  Manifest *pFrom, *pTo;
  ManifestFile *pFromFile, *pToFile;
  int asNewFlag = (diffFlags & DIFF_VERBOSE)!=0 ? 1 : 0;

  pFrom = manifest_get_by_name(zFrom, 0);
  manifest_file_rewind(pFrom);
................................................................................
      cmp = +1;
    }else if( pToFile==0 ){
      cmp = -1;
    }else{
      cmp = fossil_strcmp(pFromFile->zName, pToFile->zName);
    }
    if( cmp<0 ){
      if( file_dir_match(pFileDir, pFromFile->zName) ){
        fossil_print("DELETED %s\n", pFromFile->zName);
        if( asNewFlag ){
          diff_manifest_entry(pFromFile, 0, zDiffCmd, zBinGlob,
                              fIncludeBinary, diffFlags);
        }
      }
      pFromFile = manifest_file_next(pFrom,0);
    }else if( cmp>0 ){
      if( file_dir_match(pFileDir, pToFile->zName) ){
        fossil_print("ADDED   %s\n", pToFile->zName);
        if( asNewFlag ){
          diff_manifest_entry(0, pToFile, zDiffCmd, zBinGlob,
                              fIncludeBinary, diffFlags);
        }
      }
      pToFile = manifest_file_next(pTo,0);
    }else if( fossil_strcmp(pFromFile->zUuid, pToFile->zUuid)==0 ){
      /* No changes */
      (void)file_dir_match(pFileDir, pFromFile->zName); /* Record name usage */
      pFromFile = manifest_file_next(pFrom,0);
      pToFile = manifest_file_next(pTo,0);
    }else{
      if( file_dir_match(pFileDir, pToFile->zName) ){
        if( diffFlags & DIFF_BRIEF ){
          fossil_print("CHANGED %s\n", pFromFile->zName);
        }else{
          diff_manifest_entry(pFromFile, pToFile, zDiffCmd, zBinGlob,
                              fIncludeBinary, diffFlags);
        }
      }
      pFromFile = manifest_file_next(pFrom,0);
      pToFile = manifest_file_next(pTo,0);
    }
  }
  manifest_destroy(pFrom);
  manifest_destroy(pTo);
................................................................................
** by the diff subsystem, if any.
*/
const char *diff_get_binary_glob(void){
  const char *zBinGlob = find_option("binary", 0, 1);
  if( zBinGlob==0 ) zBinGlob = db_get("binary-glob",0);
  return zBinGlob;
}

/*
** The input is a list of file and/or directory names either in the current
** checkout, or in the undo buffer if useUndo is true, or in check-outs
** zFrom and/or zTo if they are not null.  Return a new list that consists
** of only filenames.  Any directories on the input list are expected into
** multiple files in the output list.  The output list uses space obtained
** from malloc() and is NULL terminated.
*/
static char **diff_expand_dirs(
  int argc,                /* Number of entries in argv[] */
  const char **argv,       /* List of files and/or directories to be diffed */
  const char *zFrom,       /* Source check-in name, or NULL */
  const char *zTo,         /* Target check-in name, or NULL */
  int useUndo              /* True if diffing against the undo buffer */
){
  Stmt q;
  int i;
  db_multi_exec(
    "CREATE TEMP TABLE dfiles("
    "  name TEXT PRIMARY KEY,"
    "  path TEXT"
    ") WITHOUT ROWID;"
    "CREATE TEMP TABLE allowed("
    "  fn TEXT PRIMARY KEY"
    ") WITHOUT ROWID;"
  );
  if( useUndo ){
    db_multi_exec(
      "INSERT OR IGNORE INTO allowed(fn)"
      " SELECT pathname FROM undo INTERSECT SELECT pathname FROM vfile;"
    );
  }else if( zTo ){
  }
  db_prepare(&q, "INSERT OR IGNORE INTO dfiles(names) VALUES(:txt)");
  for(i=0; i<argc; i++){
    db_bind_text(&q, ":txt", argv[i]);
    db_step(&q);
    db_reset(&q);
  }
  db_finalize(&q);
  
}

/*
** COMMAND: diff
** COMMAND: gdiff
**
** Usage: %fossil diff|gdiff ?OPTIONS? ?FILE1? ?FILE2 ...?
**
................................................................................
  const char *zTo;           /* Target version number */
  const char *zBranch;       /* Branch to diff */
  const char *zDiffCmd = 0;  /* External diff command. NULL for internal diff */
  const char *zBinGlob = 0;  /* Treat file names matching this as binary */
  int fIncludeBinary = 0;    /* Include binary files for external diff */
  int againstUndo = 0;       /* Diff against files in the undo buffer */
  u64 diffFlags = 0;         /* Flags to control the DIFF */
  FileDirList *pFileDir = 0; /* Restrict the diff to these files */

  if( find_option("tk",0,0)!=0 ){
    diff_tk("diff", 2);
    return;
  }
  isGDiff = g.argv[1][0]=='g';
  isInternDiff = find_option("internal","i",0)!=0;
................................................................................
  if( !isInternDiff ){
    zDiffCmd = diff_command_external(isGDiff);
  }
  zBinGlob = diff_get_binary_glob();
  fIncludeBinary = diff_include_binary_files();
  determine_exec_relative_option(1);
  verify_all_options();
  if( g.argc>=3 ){
    int i;
    Blob fname;
    pFileDir = fossil_malloc( sizeof(*pFileDir) * (g.argc-1) );
    memset(pFileDir, 0, sizeof(*pFileDir) * (g.argc-1));
    for(i=2; i<g.argc; i++){
      file_tree_name(g.argv[i], &fname, 0, 1);
      pFileDir[i-2].zName = fossil_strdup(blob_str(&fname));
      if( strcmp(pFileDir[i-2].zName,".")==0 ){
        pFileDir[0].zName[0] = '.';
        pFileDir[0].zName[1] = 0;
        break;
      }
      pFileDir[i-2].nName = blob_size(&fname);
      pFileDir[i-2].nUsed = 0;
      blob_reset(&fname);
    }
  }
  if( againstUndo ){
    if( db_lget_int("undo_available",0)==0 ){
      fossil_print("No undo or redo is available\n");
      return;
    }



    diff_against_undo(zDiffCmd, zBinGlob, fIncludeBinary,




                      diffFlags, pFileDir);

  }else if( zTo==0 ){



    diff_against_disk(zFrom, zDiffCmd, zBinGlob, fIncludeBinary,
                      diffFlags, pFileDir);

  }else{
    diff_two_versions(zFrom, zTo, zDiffCmd, zBinGlob, fIncludeBinary,
                      diffFlags, pFileDir);
  }


  if( pFileDir ){
    int i;



    for(i=0; pFileDir[i].zName; i++){
      if( pFileDir[i].nUsed==0 && strcmp(pFileDir[0].zName,".")!=0 ){
        fossil_fatal("not found: '%s'", g.argv[i+2]);
      }



      fossil_free(pFileDir[i].zName);
    }
    fossil_free(pFileDir);
  }
}

/*
** WEBPAGE: vpatch
** URL: /vpatch?from=FROM&to=TO
**
................................................................................
  const char *zFrom = P("from");
  const char *zTo = P("to");
  login_check_credentials();
  if( !g.perm.Read ){ login_needed(g.anon.Read); return; }
  if( zFrom==0 || zTo==0 ) fossil_redirect_home();

  cgi_set_content_type("text/plain");
  diff_two_versions(zFrom, zTo, 0, 0, 0, DIFF_VERBOSE, 0);
}