Differences From Artifact [e2e37cc69b]:

• File src/diffcmd.c — part of check-in [65724af1ce] at 2016-09-30 15:18:38 on branch diff-show-changes — Change the name of the --changes option on "fossil diff" to --checkin. (user: drh size: 31271)

To Artifact [2d1eeca32c]:

• File src/diffcmd.c — part of check-in [38daa9aa75] at 2016-09-30 15:22:23 on branch diff-show-changes — Fix a bug in the error message when the --checkin argument of fossil diff has no parent. (user: drh size: 31271) [more...]

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    int ridTo = name_to_typed_rid(zCheckin, "ci");
    zTo = zCheckin;
    zFrom = db_text(0,
      "SELECT uuid FROM blob, plink"
      " WHERE plink.cid=%d AND plink.isprim AND plink.pid=blob.rid",
      ridTo);
    if( zFrom==0 ){
      fossil_fatal("check-in %z has no parent", zTo);
    }
  }
  if( againstUndo ){
    if( db_lget_int("undo_available",0)==0 ){
      fossil_print("No undo or redo is available\n");
      return;
    }

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    int ridTo = name_to_typed_rid(zCheckin, "ci");
    zTo = zCheckin;
    zFrom = db_text(0,
      "SELECT uuid FROM blob, plink"
      " WHERE plink.cid=%d AND plink.isprim AND plink.pid=blob.rid",
      ridTo);
    if( zFrom==0 ){
      fossil_fatal("check-in %s has no parent", zTo);
    }
  }
  if( againstUndo ){
    if( db_lget_int("undo_available",0)==0 ){
      fossil_print("No undo or redo is available\n");
      return;
    }