Fossil

    const char *zSrc;    /* Tag showing origin of this line */
  } *aOrig;
  int nOrig;        /* Number of elements in aOrig[] */
  int nNoSrc;       /* Number of entries where aOrig[].zSrc==NULL */
  int iLevel;       /* Current level */
  int nVers;        /* Number of versions analyzed */
  char **azVers;    /* Names of versions analyzed */
  Blob toAnnotate;
};

/*
** Initialize the annotation process by specifying the file that is
** to be annotated.  The annotator takes control of the input Blob and
** will release it when it is finished with it.
*/
static int annotation_start(Annotator *p){
  int i;


  p->c.aTo = break_into_lines(blob_str(&p->toAnnotate),
          blob_size(&p->toAnnotate),&p->c.nTo,1);
  if( p->c.aTo==0 ){
    return 1;
  }
  p->aOrig = fossil_malloc( sizeof(p->aOrig[0])*p->c.nTo );
  for(i=0; i<p->c.nTo; i++){
    p->aOrig[i].z = p->c.aTo[i].z;
    p->aOrig[i].n = p->c.aTo[i].h & LENGTH_MASK;

  int iPrevLevel;
  int iThisLevel;

  /* Prepare the parent file to be diffed */
  p->c.aFrom = break_into_lines(blob_str(pParent), blob_size(pParent),
                                &p->c.nFrom, 1);
  if( p->c.aFrom==0 ){
    free(p->c.aFrom);
    return 1;
  }

  /* Compute the differences going from pParent to the file being
  ** annotated. */
  diff_all(&p->c);

  /* Where new lines are inserted on this difference, record the
  ** zPName as the source of the new line.
  */
  iPrevLevel = p->iLevel;
  p->iLevel++;
  iThisLevel = p->iLevel;
  for(i=lnTo=0; i<p->c.nEdit; i+=3){
    struct AnnLine *x = &p->aOrig[lnTo];
    for(j=0; j<p->c.aEdit[i]; j++, lnTo++, x++){
      if( x->zSrc==0 || x->iLevel==iPrevLevel ){
         /* TODO: handle zPName so we can free labels
          * if they get totally unreferenced in the Annotator */
         x->zSrc = zPName;
         x->iLevel = iThisLevel;
      }
    }
    lnTo += p->c.aEdit[i+2];
  }

}


/*
** COMMAND: test-annotate-step
*/
void test_annotate_step_cmd(void){
  Blob b = empty_blob;
  Annotator x;
  int i;

  if( g.argc<4 ) usage("RID1 RID2 ...");
  db_must_be_within_tree();
  memset(&x, 0, sizeof(x));
  x.toAnnotate = empty_blob;
  content_get(name_to_rid(g.argv[2]), &x.toAnnotate);
  if( annotation_start(&x) ){
    fossil_fatal("binary file");
  }
  for(i=3; i<g.argc; i++){
    blob_zero(&b);
    content_get(name_to_rid(g.argv[i]), &b);
    if( annotation_step(&x, &b, g.argv[i-1]) ){
      fossil_fatal("binary file");

  Annotator *p,        /* The annotator */
  int fnid,            /* The name of the file to be annotated */
  int mid,             /* Use the version of the file in this check-in */
  int webLabel,        /* Use web-style annotations if true */
  int iLimit,          /* Limit the number of levels if greater than zero */
  int annFlags         /* Flags to alter the annotation */
){

  Blob step = empty_blob;           /* Text of previous revision */
  int rid;             /* Artifact ID of the file being annotated */
  char *zLabel;        /* Label to apply to a line */
  Stmt q;              /* Query returning all ancestor versions */

  /* Initialize the annotation */
  rid = db_int(0, "SELECT fid FROM mlink WHERE mid=%d AND fnid=%d",mid,fnid);
  if( rid==0 ){
    fossil_panic("file #%d is unchanged in manifest #%d", fnid, mid);
  }
  memset(p, 0, sizeof(*p));
  p->toAnnotate = empty_blob;
  if( !content_get(rid, &p->toAnnotate) ){
    fossil_panic("unable to retrieve content of artifact #%d", rid);
  }
  db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
  if( iLimit<=0 ) iLimit = 1000000000;
  compute_direct_ancestors(mid, iLimit);
  annotation_start(p);

  db_prepare(&q, 
    "SELECT mlink.fid,"
    "       (SELECT uuid FROM blob WHERE rid=mlink.%s),"
    "       date(event.mtime), "
    "       coalesce(event.euser,event.user) "
    "  FROM ancestor, mlink, event"

    p->azVers = fossil_realloc(p->azVers, p->nVers*sizeof(p->azVers[0]) );
    p->azVers[p->nVers-1] = zLabel;
    content_get(pid, &step);
    annotation_step(p, &step, zLabel);
    blob_reset(&step);
  }
  db_finalize(&q);
  free(p->c.aTo);
}

/*
** WEBPAGE: annotate
**
** Query parameters:
**

  if( fnid==0 ){
    fossil_fatal("no such file: %s", zFilename);
  }
  fid = db_int(0, "SELECT rid FROM vfile WHERE pathname=%Q", zFilename);
  if( fid==0 ){
    fossil_fatal("not part of current checkout: %s", zFilename);
  }
  blob_reset(&treename);
  mid = db_int(0, "SELECT mid FROM mlink WHERE fid=%d AND fnid=%d", fid, fnid);
  if( mid==0 ){
    fossil_panic("unable to find manifest");
  }
  if( fileVers ) annFlags |= ANN_FILE_VERS;
  annotate_file(&ann, fnid, mid, 0, iLimit, annFlags);
  if( showLog ){
    for(i=0; i<ann.nVers; i++){
      printf("version %3d: %s\n", i+1, ann.azVers[i]);
    }
    printf("---------------------------------------------------\n");
  }
  for(i=0; i<ann.nOrig; i++){
    fossil_print("%s: %.*s\n", 
                 ann.aOrig[i].zSrc, ann.aOrig[i].n, ann.aOrig[i].z);
  }
  free(ann.azVers);
  free(ann.aOrig);
  blob_reset(&ann.toAnnotate);
}