thodg/libgit2/src/checkout.c

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• Hash : ec532d5e
  Author :
  Date : 2012-06-21T14:54:12
  

  Checkout: initial tree walkers.

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• src/checkout.c

• /*
   * Copyright (C) 2009-2012 the libgit2 contributors
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #include <assert.h>
  
  #include "git2/checkout.h"
  #include "git2/repository.h"
  #include "git2/refs.h"
  #include "git2/tree.h"
  #include "git2/commit.h"
  
  #include "common.h"
  #include "refs.h"
  #include "buffer.h"
  
  GIT_BEGIN_DECL
  
  
  static int get_head_tree(git_tree **out, git_repository *repo)
  {
     int retcode = GIT_ERROR;
     git_reference *head = NULL;
  
     /* Dereference HEAD all the way to an OID ref */
     if (!git_reference_lookup_resolved(&head, repo, GIT_HEAD_FILE, -1)) {
        /* The OID should be a commit */
        git_object *commit;
        if (!git_object_lookup(&commit, repo,
                               git_reference_oid(head), GIT_OBJ_COMMIT)) {
           /* Get the tree */
           if (!git_commit_tree(out, (git_commit*)commit)) {
              retcode = 0;
           }
           git_object_free(commit);
        }
        git_reference_free(head);
     }
  
     return retcode;
  }
  
  typedef struct tree_walk_data
  {
     git_indexer_stats *stats;
  } tree_walk_data;
  
  
  static int count_walker(const char *path, git_tree_entry *entry, void *payload)
  {
     GIT_UNUSED(path);
     GIT_UNUSED(entry);
     ((tree_walk_data*)payload)->stats->total++;
     return 0;
  }
  
  static int checkout_walker(const char *path, git_tree_entry *entry, void *payload)
  {
     int retcode = 0;
     tree_walk_data *data = (tree_walk_data*)payload;
  
     switch(git_tree_entry_type(entry)) {
     case GIT_OBJ_TREE:
        /* TODO: mkdir */
        break;
  
     case GIT_OBJ_BLOB:
        /* TODO: create/populate file */
        break;
  
     default:
        retcode = -1;
        break;
     }
  
     data->stats->processed++;
     return retcode;
  }
  
  /* TODO
   * -> Line endings
   */
  int git_checkout_force(git_repository *repo, git_indexer_stats *stats)
  {
     int retcode = GIT_ERROR;
     git_indexer_stats dummy_stats;
     git_tree *tree;
     tree_walk_data payload;
  
     assert(repo);
     if (!stats) stats = &dummy_stats;
  
     stats->total = stats->processed = 0;
     payload.stats = stats;
  
     if (!get_head_tree(&tree, repo)) {
        /* Count all the tree nodes for progress information */
        if (!git_tree_walk(tree, count_walker, GIT_TREEWALK_POST, &payload)) {
           /* Checkout the files */
           if (!git_tree_walk(tree, checkout_walker, GIT_TREEWALK_POST, &payload)) {
              retcode = 0;
           }
        }
        git_tree_free(tree);
     }
  
     return retcode;
  }
  
  
  GIT_END_DECL
  

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