Fossil

@ );
@ CREATE TABLE IF NOT EXISTS %s.stashfile(
@   stashid INTEGER REFERENCES stash,  -- Stash that contains this file
@   rid INTEGER,                       -- Baseline content in BLOB table or 0.
@   isAdded BOOLEAN,                   -- True if this is an added file
@   isRemoved BOOLEAN,                 -- True if this file is deleted
@   isExec BOOLEAN,                    -- True if file is executable
@   isLink BOOLEAN,                    -- True if file is a symlink
@   origname TEXT,                     -- Original filename
@   newname TEXT,                      -- New name for file at next check-in
@   delta BLOB,                        -- Delta from baseline. Content if rid=0
@   PRIMARY KEY(origname, stashid)
@ );
@ INSERT OR IGNORE INTO vvar(name, value) VALUES('stash-next', 1);
;

  Stmt ins;             /* Insert statement */

  zFile = mprintf("%/", zFName);
  file_tree_name(zFile, &fname, 1);
  zTreename = blob_str(&fname);
  blob_zero(&sql);
  blob_appendf(&sql,
    "SELECT deleted, isexe, islink, mrid, pathname, coalesce(origname,pathname)"
    "  FROM vfile"
    " WHERE vid=%d AND (chnged OR deleted OR origname NOT NULL OR mrid==0)",
    vid
  );
  if( fossil_strcmp(zTreename,".")!=0 ){
    blob_appendf(&sql,
      "   AND (pathname GLOB '%q/*' OR origname GLOB '%q/*'"
            "  OR pathname=%Q OR origname=%Q)",
      zTreename, zTreename, zTreename, zTreename
    );
  }
  db_prepare(&q, blob_str(&sql));
  blob_reset(&sql);
  db_prepare(&ins,
     "INSERT INTO stashfile(stashid, rid, isAdded, isRemoved, isExec, isLink,"
                           "origname, newname, delta)"
     "VALUES(%d,:rid,:isadd,:isrm,:isexe,:islink,:orig,:new,:content)",
     stashid
  );
  while( db_step(&q)==SQLITE_ROW ){
    int deleted = db_column_int(&q, 0);
    //int isLink = db_column_int(&q, 2);
    int rid = db_column_int(&q, 3);
    const char *zName = db_column_text(&q, 4);
    const char *zOrig = db_column_text(&q, 5);
    char *zPath = mprintf("%s%s", g.zLocalRoot, zName);
    Blob content;
    int isNewLink = file_islink(zPath);

    db_bind_int(&ins, ":rid", rid);
    db_bind_int(&ins, ":isadd", rid==0);
    db_bind_int(&ins, ":isrm", deleted);
#ifdef _WIN32
    db_bind_int(&ins, ":isexe", db_column_int(&q, 1));
    //db_bind_int(&ins, ":islink", isLink);
#endif
    db_bind_text(&ins, ":orig", zOrig);
    db_bind_text(&ins, ":new", zName);

    if( rid==0 ){
      /* A new file */
      if( isNewLink ){
        blob_read_link(&content, zPath);
      }else{
        blob_read_from_file(&content, zPath);
      }
      db_bind_blob(&ins, ":content", &content);
    }else if( deleted ){
      db_bind_null(&ins, ":content");
    }else{
      /* A modified file */
      Blob orig;
      Blob disk;
      
      if( isNewLink ){
        blob_read_link(&disk, zPath);
      }else{
        blob_read_from_file(&disk, zPath);
      }
      content_get(rid, &orig);
      blob_delta_create(&orig, &disk, &content);
      blob_reset(&orig);
      blob_reset(&disk);
      db_bind_blob(&ins, ":content", &content);
    }
    db_bind_int(&ins, ":islink", isNewLink);
    db_step(&ins);
    db_reset(&ins);
    fossil_free(zPath);
    blob_reset(&content);
  }
  db_finalize(&ins);
  db_finalize(&q);

/*
** Apply a stash to the current check-out.
*/
static void stash_apply(int stashid, int nConflict){
  Stmt q;
  db_prepare(&q,
     "SELECT rid, isRemoved, isExec, isLink, origname, newname, delta"
     "  FROM stashfile WHERE stashid=%d",
     stashid
  );
  while( db_step(&q)==SQLITE_ROW ){
    int rid = db_column_int(&q, 0);
    int isRemoved = db_column_int(&q, 1);
    int isLink = db_column_int(&q, 3);
    const char *zOrig = db_column_text(&q, 4);
    const char *zNew = db_column_text(&q, 5);
    char *zOPath = mprintf("%s%s", g.zLocalRoot, zOrig);
    char *zNPath = mprintf("%s%s", g.zLocalRoot, zNew);
    Blob delta;
    undo_save(zNew);
    blob_zero(&delta);
    if( rid==0 ){
      db_ephemeral_blob(&q, 5, &delta);
      blob_write_to_file(&delta, zNPath);
      printf("ADD %s\n", zNew);
    }else if( isRemoved ){
      printf("DELETE %s\n", zOrig);
      unlink(zOPath);
    }else{
      Blob a, b, out, disk;
      int isNewLink = file_islink(zOPath);
      db_ephemeral_blob(&q, 5, &delta);
      if( isNewLink ){
        blob_read_link(&disk, zOPath);
      }else{
        blob_read_from_file(&disk, zOPath);
      }
      content_get(rid, &a);
      blob_delta_apply(&a, &delta, &b);
      if( blob_compare(&disk, &a)==0 && isLink == isNewLink ){
        if( isLink || isNewLink ){
          unlink(zNPath);
        }
        if( isLink ){
          create_symlink(blob_str(&b), zNPath);
        }else{
          blob_write_to_file(&b, zNPath);          
        }
        printf("UPDATE %s\n", zNew);
      }else{
        int rc;
        if( isLink || isNewLink ){
          rc = -1;
          blob_zero(&b); /* because we reset it later */
          //TODO write something to disk?
        }else{
          rc = blob_merge(&a, &disk, &b, &out);
          blob_write_to_file(&out, zNPath);          
          blob_reset(&out);
        }
        if( rc ){
          printf("CONFLICT %s\n", zNew);
          nConflict++;
        }else{
          printf("MERGE %s\n", zNew);
        }

      }
      blob_reset(&a);
      blob_reset(&b);
      blob_reset(&disk);
    }
    blob_reset(&delta);
    if( fossil_strcmp(zOrig,zNew)!=0 ){
      undo_save(zOrig);
      unlink(zOPath);
    }
  }
  db_finalize(&q);
  if( nConflict ){
    printf("WARNING: %d merge conflicts - see messages above for details.\n",
            nConflict);
  }
}

/*
** Show the diffs associate with a single stash.
*/
static void stash_diff(int stashid, const char *zDiffCmd){
  Stmt q;
  Blob empty;
  blob_zero(&empty);
  db_prepare(&q,
     "SELECT rid, isRemoved, isExec, isLink, origname, newname, delta"
     "  FROM stashfile WHERE stashid=%d",
     stashid
  );
  while( db_step(&q)==SQLITE_ROW ){
    int rid = db_column_int(&q, 0);
    int isRemoved = db_column_int(&q, 1);
    int isLink = db_column_int(&q, 3);
    const char *zOrig = db_column_text(&q, 4);
    const char *zNew = db_column_text(&q, 5);
    char *zOPath = mprintf("%s%s", g.zLocalRoot, zOrig);
    Blob delta;
    if( rid==0 ){
      db_ephemeral_blob(&q, 5, &delta);
      printf("ADDED %s\n", zNew);
      diff_print_index(zNew);
      diff_file_mem(&empty, &delta, zNew, zDiffCmd, 0);
    }else if( isRemoved ){
      printf("DELETE %s\n", zOrig);
      if( file_islink(zOPath) ){
        blob_read_link(&delta, zOPath);
      }else{
        blob_read_from_file(&delta, zOPath);
      }
      diff_print_index(zNew);
      diff_file_mem(&delta, &empty, zOrig, zDiffCmd, 0);
    }else{
      Blob a, b, disk;
      int isOrigLink = file_islink(zOPath);
      db_ephemeral_blob(&q, 5, &delta);
      if( isOrigLink ){
        blob_read_link(&disk, zOPath);
      }else{
        blob_read_from_file(&disk, zOPath);        
      }
      printf("CHANGED %s\n", zNew);
      if( !isOrigLink != !isLink ){
        diff_print_index(zNew);
        printf("--- %s\n+++ %s\n", zOrig, zNew);
        printf("cannot compute difference between symlink and regular file\n");
      }else{
        content_get(rid, &a);
        blob_delta_apply(&a, &delta, &b);

        diff_file_mem(&disk, &b, zNew, zDiffCmd, 0);
        blob_reset(&a);
        blob_reset(&b);
      }
      blob_reset(&disk);
    }
    blob_reset(&delta);
 }
  db_finalize(&q);
}

**  fossil stash drop ?STASHID? ?--all?
**
**     Forget everything about STASHID.  Forget the whole stash if the
**     --all flag is used.  Individual drops are undoable but --all is not.
**
**  fossil stash snapshot ?-m COMMENT? ?FILES...?
**
**     Save the current changes in the working tree as a new stash
**     but, unlike "save", do not revert those changes.
**
**  fossil stash diff ?STASHID?
**  fossil stash gdiff ?STASHID?
**
**     Show diffs of the current working directory and what that
**     directory would be if STASHID were applied.