Fossil

/*
** Load the record ID rid and up to N-1 closest ancestors into
** the "ok" table.
*/
void compute_ancestors(int rid, int N){
  Bag seen;
  PQueue queue;


  bag_init(&seen);
  pqueue_init(&queue);
  bag_insert(&seen, rid);
  pqueue_insert(&queue, rid, 0.0, 0);
  while( (N--)>0 && (rid = pqueue_extract(&queue, 0))!=0 ){
    Stmt q;
    db_multi_exec("INSERT OR IGNORE INTO ok VALUES(%d)", rid);
    db_prepare(&q,
       "SELECT a.pid, b.mtime FROM plink a LEFT JOIN plink b ON b.cid=a.pid"
       " WHERE a.cid=%d", rid
    );





    while( db_step(&q)==SQLITE_ROW ){
      int pid = db_column_int(&q, 0);
      double mtime = db_column_double(&q, 1);
      if( bag_insert(&seen, pid) ){
        pqueue_insert(&queue, pid, -mtime, 0);
      }
    }
    db_finalize(&q);
  }
  bag_clear(&seen);
  pqueue_clear(&queue);


}

/*
** Load the record ID rid and up to N-1 closest descendants into
** the "ok" table.
*/
void compute_descendants(int rid, int N){
  Bag seen;
  PQueue queue;



  bag_init(&seen);
  pqueue_init(&queue);
  bag_insert(&seen, rid);
  pqueue_insert(&queue, rid, 0.0, 0);
  while( (N--)>0 && (rid = pqueue_extract(&queue, 0))!=0 ){
    Stmt q;
    db_multi_exec("INSERT OR IGNORE INTO ok VALUES(%d)", rid);
    db_prepare(&q,"SELECT cid, mtime FROM plink WHERE pid=%d", rid);



    while( db_step(&q)==SQLITE_ROW ){
      int pid = db_column_int(&q, 0);
      double mtime = db_column_double(&q, 1);
      if( bag_insert(&seen, pid) ){
        pqueue_insert(&queue, pid, mtime, 0);
      }
    }
    db_finalize(&q);
  }
  bag_clear(&seen);
  pqueue_clear(&queue);


}

/*
** COMMAND:  descendants
**
** Usage: %fossil descendants ?BASELINE-ID?
**

/*
** Load the record ID rid and up to N-1 closest ancestors into
** the "ok" table.
*/
void compute_ancestors(int rid, int N){
  Bag seen;
  PQueue queue;
  Stmt ins;
  Stmt q;
  bag_init(&seen);
  pqueue_init(&queue);
  bag_insert(&seen, rid);
  pqueue_insert(&queue, rid, 0.0, 0);


  db_prepare(&ins, "INSERT OR IGNORE INTO ok VALUES(:rid)");
  db_prepare(&q,
    "SELECT a.pid, b.mtime FROM plink a LEFT JOIN plink b ON b.cid=a.pid"
    " WHERE a.cid=:rid"
  );
  while( (N--)>0 && (rid = pqueue_extract(&queue, 0))!=0 ){
    db_bind_int(&ins, ":rid", rid);
    db_step(&ins);
    db_reset(&ins);
    db_bind_int(&q, ":rid", rid);
    while( db_step(&q)==SQLITE_ROW ){
      int pid = db_column_int(&q, 0);
      double mtime = db_column_double(&q, 1);
      if( bag_insert(&seen, pid) ){
        pqueue_insert(&queue, pid, -mtime, 0);
      }
    }
    db_reset(&q);
  }
  bag_clear(&seen);
  pqueue_clear(&queue);
  db_finalize(&ins);
  db_finalize(&q);
}

/*
** Load the record ID rid and up to N-1 closest descendants into
** the "ok" table.
*/
void compute_descendants(int rid, int N){
  Bag seen;
  PQueue queue;
  Stmt ins;
  Stmt q;

  bag_init(&seen);
  pqueue_init(&queue);
  bag_insert(&seen, rid);
  pqueue_insert(&queue, rid, 0.0, 0);
  db_prepare(&ins, "INSERT OR IGNORE INTO ok VALUES(:rid)");
  db_prepare(&q, "SELECT cid, mtime FROM plink WHERE pid=:rid");
  while( (N--)>0 && (rid = pqueue_extract(&queue, 0))!=0 ){
    db_bind_int(&ins, ":rid", rid);
    db_step(&ins);
    db_reset(&ins);
    db_bind_int(&q, ":rid", rid);
    while( db_step(&q)==SQLITE_ROW ){
      int pid = db_column_int(&q, 0);
      double mtime = db_column_double(&q, 1);
      if( bag_insert(&seen, pid) ){
        pqueue_insert(&queue, pid, mtime, 0);
      }
    }
    db_reset(&q);
  }
  bag_clear(&seen);
  pqueue_clear(&queue);
  db_finalize(&ins);
  db_finalize(&q);
}

/*
** COMMAND:  descendants
**
** Usage: %fossil descendants ?BASELINE-ID?
**

  for(i=0; i<x.nOrig; i++){
    const char *zSrc = x.aOrig[i].zSrc;
    if( zSrc==0 ) zSrc = g.argv[g.argc-1];
    fossil_print("%10s: %.*s\n", zSrc, x.aOrig[i].n, x.aOrig[i].z);
  }
}




/*
** Compute a complete annotation on a file.  The file is identified
** by its filename number (filename.fnid) and the baseline in which
** it was checked in (mlink.mid).
*/
static void annotate_file(
  Annotator *p,        /* The annotator */
  int fnid,            /* The name of the file to be annotated */
  int mid,             /* The specific version of the file for this step */
  int webLabel,        /* Use web-style annotations if true */
  int iLimit           /* Limit the number of levels if greater than zero */

){
  Blob toAnnotate;     /* Text of the final version of the file */
  Blob step;           /* 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 */

................................................................................
    fossil_panic("unable to retrieve content of artifact #%d", rid);
  }
  db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
  compute_ancestors(mid, 1000000000);
  annotation_start(p, &toAnnotate);

  db_prepare(&q, 
    "SELECT mlink.fid, blob.uuid, date(event.mtime), "


    "       coalesce(event.euser,event.user) "
    "  FROM mlink, blob, event"
    " WHERE mlink.fnid=%d"
    "   AND mlink.mid IN ok"
    "   AND blob.rid=mlink.mid"
    "   AND event.objid=mlink.mid"
    " ORDER BY event.mtime DESC"
    " LIMIT %d",

    fnid,
    iLimit>0 ? iLimit : 10000000
  );
  while( db_step(&q)==SQLITE_ROW ){
    int pid = db_column_int(&q, 0);
    const char *zUuid = db_column_text(&q, 1);
    const char *zDate = db_column_text(&q, 2);
................................................................................
**    filename=FILENAME   The filename.
*/
void annotation_page(void){
  int mid;
  int fnid;
  int i;
  int iLimit;

  Annotator ann;

  login_check_credentials();
  if( !g.okRead ){ login_needed(); return; }
  mid = name_to_rid(PD("checkin","0"));
  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", P("filename"));
  if( mid==0 || fnid==0 ){ fossil_redirect_home(); }
  iLimit = atoi(PD("limit","-1"));
  if( !db_exists("SELECT 1 FROM mlink WHERE mid=%d AND fnid=%d",mid,fnid) ){
    fossil_redirect_home();
  }
  style_header("File Annotation");

  annotate_file(&ann, fnid, mid, g.okHistory, iLimit);
  if( P("log") ){
    int i;
    @ <h2>Versions analyzed:</h2>
    @ <ol>
    for(i=0; i<ann.nVers; i++){
      @ <li><tt>%s(ann.azVers[i])</tt></li>
    }
................................................................................
**
** Output the text of a file with markings to show when each line of
** the file was last modified.
**
** Options:
**   --limit N       Only look backwards in time by N versions
**   --log           List all versions analyzed

*/
void annotate_cmd(void){
  int fnid;         /* Filename ID */
  int fid;          /* File instance ID */
  int mid;          /* Manifest where file was checked in */
  Blob treename;    /* FILENAME translated to canonical form */
  char *zFilename;  /* Cannonical filename */
  Annotator ann;    /* The annotation of the file */
  int i;            /* Loop counter */
  const char *zLimit; /* The value to the --limit option */
  int iLimit;       /* How far back in time to look */
  int showLog;      /* True to show the log */



  zLimit = find_option("limit",0,1);
  if( zLimit==0 || zLimit[0]==0 ) zLimit = "-1";
  iLimit = atoi(zLimit);
  showLog = find_option("log",0,0)!=0;

  db_must_be_within_tree();
  if (g.argc<3) {
    usage("FILENAME");
  }
  file_tree_name(g.argv[2], &treename, 1);
  zFilename = blob_str(&treename);
  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", zFilename);
................................................................................
  if( fid==0 ){
    fossil_fatal("not part of current checkout: %s", zFilename);
  }
  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");
  }

  annotate_file(&ann, fnid, mid, 0, iLimit);
  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);
  }
}

  for(i=0; i<x.nOrig; i++){
    const char *zSrc = x.aOrig[i].zSrc;
    if( zSrc==0 ) zSrc = g.argv[g.argc-1];
    fossil_print("%10s: %.*s\n", zSrc, x.aOrig[i].n, x.aOrig[i].z);
  }
}

/* Annotation flags */
#define ANN_FILE_VERS  0x001  /* Show file version rather than commit version */

/*
** Compute a complete annotation on a file.  The file is identified
** by its filename number (filename.fnid) and the baseline in which
** it was checked in (mlink.mid).
*/
static void annotate_file(
  Annotator *p,        /* The annotator */
  int fnid,            /* The name of the file to be annotated */
  int mid,             /* The specific version of the file for this step */
  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 toAnnotate;     /* Text of the final version of the file */
  Blob step;           /* 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 */

................................................................................
    fossil_panic("unable to retrieve content of artifact #%d", rid);
  }
  db_multi_exec("CREATE TEMP TABLE ok(rid INTEGER PRIMARY KEY)");
  compute_ancestors(mid, 1000000000);
  annotation_start(p, &toAnnotate);

  db_prepare(&q, 
    "SELECT mlink.fid,"
    "       (SELECT uuid FROM blob WHERE rid=mlink.%s),"
    "       date(event.mtime), "
    "       coalesce(event.euser,event.user) "
    "  FROM mlink, event"
    " WHERE mlink.fnid=%d"
    "   AND mlink.mid IN ok"

    "   AND event.objid=mlink.mid"
    " ORDER BY event.mtime DESC"
    " LIMIT %d",
    (annFlags & ANN_FILE_VERS)!=0 ? "fid" : "mid",
    fnid,
    iLimit>0 ? iLimit : 10000000
  );
  while( db_step(&q)==SQLITE_ROW ){
    int pid = db_column_int(&q, 0);
    const char *zUuid = db_column_text(&q, 1);
    const char *zDate = db_column_text(&q, 2);
................................................................................
**    filename=FILENAME   The filename.
*/
void annotation_page(void){
  int mid;
  int fnid;
  int i;
  int iLimit;
  int annFlags = 0;
  Annotator ann;

  login_check_credentials();
  if( !g.okRead ){ login_needed(); return; }
  mid = name_to_rid(PD("checkin","0"));
  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", P("filename"));
  if( mid==0 || fnid==0 ){ fossil_redirect_home(); }
  iLimit = atoi(PD("limit","-1"));
  if( !db_exists("SELECT 1 FROM mlink WHERE mid=%d AND fnid=%d",mid,fnid) ){
    fossil_redirect_home();
  }
  style_header("File Annotation");
  if( P("filevers") ) annFlags |= ANN_FILE_VERS;
  annotate_file(&ann, fnid, mid, g.okHistory, iLimit, annFlags);
  if( P("log") ){
    int i;
    @ <h2>Versions analyzed:</h2>
    @ <ol>
    for(i=0; i<ann.nVers; i++){
      @ <li><tt>%s(ann.azVers[i])</tt></li>
    }
................................................................................
**
** Output the text of a file with markings to show when each line of
** the file was last modified.
**
** Options:
**   --limit N       Only look backwards in time by N versions
**   --log           List all versions analyzed
**   --filevers      Show file version numbers rather than check-in versions
*/
void annotate_cmd(void){
  int fnid;         /* Filename ID */
  int fid;          /* File instance ID */
  int mid;          /* Manifest where file was checked in */
  Blob treename;    /* FILENAME translated to canonical form */
  char *zFilename;  /* Cannonical filename */
  Annotator ann;    /* The annotation of the file */
  int i;            /* Loop counter */
  const char *zLimit; /* The value to the --limit option */
  int iLimit;       /* How far back in time to look */
  int showLog;      /* True to show the log */
  int fileVers;     /* Show file version instead of check-in versions */
  int annFlags = 0; /* Flags to control annotation properties */

  zLimit = find_option("limit",0,1);
  if( zLimit==0 || zLimit[0]==0 ) zLimit = "-1";
  iLimit = atoi(zLimit);
  showLog = find_option("log",0,0)!=0;
  fileVers = find_option("filevers",0,0)!=0;
  db_must_be_within_tree();
  if (g.argc<3) {
    usage("FILENAME");
  }
  file_tree_name(g.argv[2], &treename, 1);
  zFilename = blob_str(&treename);
  fnid = db_int(0, "SELECT fnid FROM filename WHERE name=%Q", zFilename);
................................................................................
  if( fid==0 ){
    fossil_fatal("not part of current checkout: %s", zFilename);
  }
  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);
  }
}

}


/*
** WEBPAGE: finfo
** URL: /finfo?name=FILENAME
**
** Show the complete change history for a single file. 






*/
void finfo_page(void){
  Stmt q;
  const char *zFilename;
  char zPrevDate[20];



  Blob title;

  GraphContext *pGraph;

  login_check_credentials();
  if( !g.okRead ){ login_needed(); return; }
  style_header("File History");
  login_anonymous_available();

  zPrevDate[0] = 0;
  zFilename = PD("name","");
  db_prepare(&q,

    "SELECT"
    " datetime(event.mtime,'localtime'),"            /* Date of change */
    " coalesce(event.ecomment, event.comment),"      /* Check-in comment */
    " coalesce(event.euser, event.user),"            /* User who made chng */
    " mlink.pid,"                                    /* Parent rid */
    " mlink.fid,"                                    /* File rid */
    " (SELECT uuid FROM blob WHERE rid=mlink.pid),"  /* Parent file uuid */
................................................................................
    " (SELECT uuid FROM blob WHERE rid=mlink.fid),"  /* Current file uuid */
    " (SELECT uuid FROM blob WHERE rid=mlink.mid),"  /* Check-in uuid */
    " event.bgcolor,"                                /* Background color */
    " (SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0"
                                " AND tagxref.rid=mlink.mid)" /* Tags */
    "  FROM mlink, event"
    " WHERE mlink.fnid=(SELECT fnid FROM filename WHERE name=%Q)"
    "   AND event.objid=mlink.mid"
    " ORDER BY event.mtime DESC /*sort*/",
    TAG_BRANCH,
    zFilename
  );












  blob_zero(&title);
  blob_appendf(&title, "History of ");
  hyperlinked_path(zFilename, &title, 0);
  @ <h2>%b(&title)</h2>
  blob_reset(&title);
  pGraph = graph_init();
  @ <div id="canvas" style="position:relative;width:1px;height:1px;"></div>
................................................................................
    const char *zBgClr = db_column_text(&q, 8);
    const char *zBr = db_column_text(&q, 9);
    int gidx;
    char zTime[10];
    char zShort[20];
    char zShortCkin[20];
    if( zBr==0 ) zBr = "trunk";
    gidx = graph_add_row(pGraph, frid, fpid>0 ? 1 : 0, &fpid, zBr, zBgClr, 1);
    if( memcmp(zDate, zPrevDate, 10) ){
      sqlite3_snprintf(sizeof(zPrevDate), zPrevDate, "%.10s", zDate);
      @ <tr><td>
      @   <div class="divider">%s(zPrevDate)</div>
      @ </td></tr>
    }
    memcpy(zTime, &zDate[11], 5);
................................................................................
      @ <a href="%s(g.zTop)/annotate?checkin=%S(zCkin)&amp;filename=%h(z)">
      @ [annotate]</a>
    }
    @ </td></tr>
  }
  db_finalize(&q);
  if( pGraph ){
    graph_finish(pGraph, 1);
    if( pGraph->nErr ){
      graph_free(pGraph);
      pGraph = 0;
    }else{

      @ <tr><td></td><td><div style="width:%d(pGraph->mxRail*20+30)px;"></div>
      @     </td></tr>
    }
  }
  @ </table>
  timeline_output_graph_javascript(pGraph, 1);
  style_footer();
}

}


/*
** WEBPAGE: finfo
** URL: /finfo?name=FILENAME
**
** Show the change history for a single file. 
**
** Additional query parameters:
**
**    a=DATE     Only show changes after DATE
**    b=DATE     Only show changes before DATE
**    n=NUM      Show the first NUM changes only
*/
void finfo_page(void){
  Stmt q;
  const char *zFilename;
  char zPrevDate[20];
  const char *zA;
  const char *zB;
  int n;
  Blob title;
  Blob sql;
  GraphContext *pGraph;

  login_check_credentials();
  if( !g.okRead ){ login_needed(); return; }
  style_header("File History");
  login_anonymous_available();

  zPrevDate[0] = 0;
  zFilename = PD("name","");
  blob_zero(&sql);
  blob_appendf(&sql, 
    "SELECT"
    " datetime(event.mtime,'localtime'),"            /* Date of change */
    " coalesce(event.ecomment, event.comment),"      /* Check-in comment */
    " coalesce(event.euser, event.user),"            /* User who made chng */
    " mlink.pid,"                                    /* Parent rid */
    " mlink.fid,"                                    /* File rid */
    " (SELECT uuid FROM blob WHERE rid=mlink.pid),"  /* Parent file uuid */
................................................................................
    " (SELECT uuid FROM blob WHERE rid=mlink.fid),"  /* Current file uuid */
    " (SELECT uuid FROM blob WHERE rid=mlink.mid),"  /* Check-in uuid */
    " event.bgcolor,"                                /* Background color */
    " (SELECT value FROM tagxref WHERE tagid=%d AND tagtype>0"
                                " AND tagxref.rid=mlink.mid)" /* Tags */
    "  FROM mlink, event"
    " WHERE mlink.fnid=(SELECT fnid FROM filename WHERE name=%Q)"
    "   AND event.objid=mlink.mid",

    TAG_BRANCH,
    zFilename
  );
  if( (zA = P("a"))!=0 ){
    blob_appendf(&sql, " AND event.mtime>=julianday('%q')", zA);
  }
  if( (zB = P("b"))!=0 ){
    blob_appendf(&sql, " AND event.mtime<=julianday('%q')", zB);
  }
  blob_appendf(&sql," ORDER BY event.mtime DESC /*sort*/");
  if( (n = atoi(PD("n","0")))>0 ){
    blob_appendf(&sql, " LIMIT %d", n);
  }
  db_prepare(&q, blob_str(&sql));
  blob_reset(&sql);
  blob_zero(&title);
  blob_appendf(&title, "History of ");
  hyperlinked_path(zFilename, &title, 0);
  @ <h2>%b(&title)</h2>
  blob_reset(&title);
  pGraph = graph_init();
  @ <div id="canvas" style="position:relative;width:1px;height:1px;"></div>
................................................................................
    const char *zBgClr = db_column_text(&q, 8);
    const char *zBr = db_column_text(&q, 9);
    int gidx;
    char zTime[10];
    char zShort[20];
    char zShortCkin[20];
    if( zBr==0 ) zBr = "trunk";
    gidx = graph_add_row(pGraph, frid, fpid>0 ? 1 : 0, &fpid, zBr, zBgClr, 0);
    if( memcmp(zDate, zPrevDate, 10) ){
      sqlite3_snprintf(sizeof(zPrevDate), zPrevDate, "%.10s", zDate);
      @ <tr><td>
      @   <div class="divider">%s(zPrevDate)</div>
      @ </td></tr>
    }
    memcpy(zTime, &zDate[11], 5);
................................................................................
      @ <a href="%s(g.zTop)/annotate?checkin=%S(zCkin)&amp;filename=%h(z)">
      @ [annotate]</a>
    }
    @ </td></tr>
  }
  db_finalize(&q);
  if( pGraph ){
    graph_finish(pGraph, 0);
    if( pGraph->nErr ){
      graph_free(pGraph);
      pGraph = 0;
    }else{
      @ <tr><td></td><td>
      @ <div id="grbtm" style="width:%d(pGraph->mxRail*20+30)px;"></div>
      @     </td></tr>
    }
  }
  @ </table>
  timeline_output_graph_javascript(pGraph, 0);
  style_footer();
}

        pLoop->railInUse |= mask;
      }
    }
  }
  pChild->mergeIn[pParent->mergeOut/4] = (pParent->mergeOut&3)+1;
}

















/*
** Compute the complete graph
*/
void graph_finish(GraphContext *p, int omitDescenders){
  GraphRow *pRow, *pDesc, *pDup, *pLoop, *pParent;
  int i;
  u32 mask;
  u32 inUse;
  int hasDup = 0;    /* True if one or more isDup entries */
  const char *zTrunk;

  if( p==0 || p->pFirst==0 || p->nErr ) return;
  p->nErr = 1;   /* Assume an error until proven otherwise */

  /* Initialize all rows */
  p->nHash = p->nRow*2 + 1;
................................................................................
  ** each to a rail and draw descenders to the bottom of the screen.
  **
  ** Strive to put the "trunk" branch on far left.
  */
  zTrunk = persistBranchName(p, "trunk");
  for(i=0; i<2; i++){
    for(pRow=p->pLast; pRow; pRow=pRow->pPrev){

      if( i==0 ){
        if( pRow->zBranch!=zTrunk ) continue;
      }else {
        if( pRow->iRail>=0 ) continue;
      }
      if( pRow->nParent==0 || hashFind(p,pRow->aParent[0])==0 ){
        if( omitDescenders ){
................................................................................
            pLoop->railInUse |= mask;
          }
        }
      }
      continue;
    }
    if( pRow->isDup ){
      pRow->iRail = findFreeRail(p, pRow->idx, pRow->idx, inUse, 0);
      if( p->mxRail>=GR_MAX_RAIL ) return;
      pDesc = pRow;
      pParent = 0;
    }else{
      assert( pRow->nParent>0 );
      parentRid = pRow->aParent[0];
      pParent = hashFind(p, parentRid);
      if( pParent==0 ){
        pRow->iRail = ++p->mxRail;
        if( p->mxRail>=GR_MAX_RAIL ) return;
................................................................................
    }
  }

  /*
  ** Insert merge rails from primaries to duplicates. 
  */
  if( hasDup ){






    for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
      if( !pRow->isDup ) continue;

      pDesc = hashFind(p, pRow->rid);
      assert( pDesc!=0 && pDesc!=pRow );
      createMergeRiser(p, pDesc, pRow);

    }






    if( p->mxRail>=GR_MAX_RAIL ) return;
  }

  /*
  ** Find the maximum rail number.
  */
  p->mxRail = 0;
  for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
    if( pRow->iRail>p->mxRail ) p->mxRail = pRow->iRail;
    if( pRow->mergeOut/4>p->mxRail ) p->mxRail = pRow->mergeOut/4;
    while( p->mxRail<GR_MAX_RAIL && pRow->mergeDown>((1<<(p->mxRail+1))-1) ){
      p->mxRail++;
    }
  }
  p->nErr = 0;
}

        pLoop->railInUse |= mask;
      }
    }
  }
  pChild->mergeIn[pParent->mergeOut/4] = (pParent->mergeOut&3)+1;
}

/*
** Compute the maximum rail number.
*/
static void find_max_rail(GraphContext *p){
  GraphRow *pRow;
  p->mxRail = 0;
  for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
    if( pRow->iRail>p->mxRail ) p->mxRail = pRow->iRail;
    if( pRow->mergeOut/4>p->mxRail ) p->mxRail = pRow->mergeOut/4;
    while( p->mxRail<GR_MAX_RAIL && pRow->mergeDown>((1<<(p->mxRail+1))-1) ){
      p->mxRail++;
    }
  }
}


/*
** Compute the complete graph
*/
void graph_finish(GraphContext *p, int omitDescenders){
  GraphRow *pRow, *pDesc, *pDup, *pLoop, *pParent;
  int i;
  u32 mask;
  u32 inUse;
  int hasDup = 0;      /* True if one or more isDup entries */
  const char *zTrunk;

  if( p==0 || p->pFirst==0 || p->nErr ) return;
  p->nErr = 1;   /* Assume an error until proven otherwise */

  /* Initialize all rows */
  p->nHash = p->nRow*2 + 1;
................................................................................
  ** each to a rail and draw descenders to the bottom of the screen.
  **
  ** Strive to put the "trunk" branch on far left.
  */
  zTrunk = persistBranchName(p, "trunk");
  for(i=0; i<2; i++){
    for(pRow=p->pLast; pRow; pRow=pRow->pPrev){
      if( pRow->isDup ) continue;
      if( i==0 ){
        if( pRow->zBranch!=zTrunk ) continue;
      }else {
        if( pRow->iRail>=0 ) continue;
      }
      if( pRow->nParent==0 || hashFind(p,pRow->aParent[0])==0 ){
        if( omitDescenders ){
................................................................................
            pLoop->railInUse |= mask;
          }
        }
      }
      continue;
    }
    if( pRow->isDup ){
      continue;



    }else{
      assert( pRow->nParent>0 );
      parentRid = pRow->aParent[0];
      pParent = hashFind(p, parentRid);
      if( pParent==0 ){
        pRow->iRail = ++p->mxRail;
        if( p->mxRail>=GR_MAX_RAIL ) return;
................................................................................
    }
  }

  /*
  ** Insert merge rails from primaries to duplicates. 
  */
  if( hasDup ){
    int dupRail;
    int mxRail;
    find_max_rail(p);
    mxRail = p->mxRail;
    dupRail = mxRail+1;
    if( p->mxRail>=GR_MAX_RAIL ) return;
    for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
      if( !pRow->isDup ) continue;
      pRow->iRail = dupRail;
      pDesc = hashFind(p, pRow->rid);
      assert( pDesc!=0 && pDesc!=pRow );
      createMergeRiser(p, pDesc, pRow);
      if( pDesc->mergeOut/4>mxRail ) mxRail = pDesc->mergeOut/4;
    }
    if( dupRail<=mxRail ){
      dupRail = mxRail+1;
      for(pRow=p->pFirst; pRow; pRow=pRow->pNext){
        if( pRow->isDup ) pRow->iRail = dupRail;
      }
    }
    if( mxRail>=GR_MAX_RAIL ) return;
  }

  /*
  ** Find the maximum rail number.
  */
  find_max_rail(p);







  p->nErr = 0;
}

  }
}

/*
** Malloc and free routines that cannot fail
*/
void *fossil_malloc(size_t n){
  void *p = malloc(n);
  if( p==0 ) fossil_panic("out of memory");
  return p;
}
void fossil_free(void *p){
  free(p);
}
void *fossil_realloc(void *p, size_t n){

  }
}

/*
** Malloc and free routines that cannot fail
*/
void *fossil_malloc(size_t n){
  void *p = malloc(n==0 ? 1 : n);
  if( p==0 ) fossil_panic("out of memory");
  return p;
}
void fossil_free(void *p){
  free(p);
}
void *fossil_realloc(void *p, size_t n){