Class: Grit::Repo

Inherits:
Object
  • Object
show all
Defined in:
lib/grit/repo.rb

Constant Summary collapse

DAEMON_EXPORT_FILE =
'git-daemon-export-ok'
BATCH_PARSERS =
{
  'commit' => ::Grit::Commit
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path, options = {}) ⇒ Repo

Public: Create a new Repo instance.

path - The String path to either the root git directory or the bare

git repo. Bare repos are expected to end with ".git".

options - A Hash of options (default: {}):

:is_bare - Boolean whether to consider the repo as bare even
           if the repo name does not end with ".git".

Examples

r = Repo.new("/Users/tom/dev/normal")
r = Repo.new("/Users/tom/public/bare.git")
r = Repo.new("/Users/tom/public/bare", {:is_bare => true})

Returns a newly initialized Grit::Repo. Raises Grit::InvalidGitRepositoryError if the path exists but is not

a Git repository.

Raises Grit::NoSuchPathError if the path does not exist.


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# File 'lib/grit/repo.rb', line 40

def initialize(path, options = {})
  epath = File.expand_path(path)

  if File.exist?(File.join(epath, '.git'))
    self.working_dir = epath
    self.path = File.join(epath, '.git')
    @bare = false
  elsif File.exist?(epath) && (epath =~ /\.git$/ || options[:is_bare])
    self.path = epath
    @bare = true
  elsif File.exist?(epath)
    raise InvalidGitRepositoryError.new(epath)
  else
    raise NoSuchPathError.new(epath)
  end

  self.git = Git.new(self.path)
end

Instance Attribute Details

#bareObject (readonly)

Public: The Boolean of whether or not the repo is bare.


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# File 'lib/grit/repo.rb', line 17

def bare
  @bare
end

#gitObject

Public: The Grit::Git command line interface object.


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# File 'lib/grit/repo.rb', line 20

def git
  @git
end

#pathObject

Public: The String path of the Git repo.


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# File 'lib/grit/repo.rb', line 10

def path
  @path
end

#working_dirObject

Public: The String path to the working directory of the repo, or nil if there is no working directory.


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# File 'lib/grit/repo.rb', line 14

def working_dir
  @working_dir
end

Class Method Details

.init(path, git_options = {}, repo_options = {}) ⇒ Object

Public: Initialize a git repository (create it on the filesystem). By default, the newly created repository will contain a working directory. If you would like to create a bare repo, use Grit::Repo.init_bare.

path - The String full path to the repo. Traditionally ends with

"/<name>.git".

git_options - A Hash of additional options to the git init command

(default: {}).

repo_options - A Hash of additional options to the Grit::Repo.new call

(default: {}).

Examples

Grit::Repo.init('/var/git/myrepo.git')

Returns the newly created Grit::Repo.


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# File 'lib/grit/repo.rb', line 75

def self.init(path, git_options = {}, repo_options = {})
  git_options = {:base => false}.merge(git_options)
  git = Git.new(path)
  git.fs_mkdir('..')
  git.init(git_options, path)
  self.new(path, repo_options)
end

.init_bare(path, git_options = {}, repo_options = {}) ⇒ Object

Public: Initialize a bare git repository (create it on the filesystem).

path - The String full path to the repo. Traditionally ends with

"/<name>.git".

git_options - A Hash of additional options to the git init command

(default: {}).

repo_options - A Hash of additional options to the Grit::Repo.new call

(default: {}).

Examples

Grit::Repo.init_bare('/var/git/myrepo.git')

Returns the newly created Grit::Repo.


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# File 'lib/grit/repo.rb', line 97

def self.init_bare(path, git_options = {}, repo_options = {})
  git_options = {:bare => true}.merge(git_options)
  git = Git.new(path)
  git.fs_mkdir('..')
  git.init(git_options)
  repo_options = {:is_bare => true}.merge(repo_options)
  self.new(path, repo_options)
end

.init_bare_or_open(path, git_options = {}, repo_options = {}) ⇒ Object

Public: Initialize a bare Git repository (create it on the filesystem) or, if the repo already exists, simply return it.

path - The String full path to the repo. Traditionally ends with

"/<name>.git".

git_options - A Hash of additional options to the git init command

(default: {}).

repo_options - A Hash of additional options to the Grit::Repo.new call

(default: {}).

Returns the new or existing Grit::Repo.


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# File 'lib/grit/repo.rb', line 117

def self.init_bare_or_open(path, git_options = {}, repo_options = {})
  git = Git.new(path)

  unless git.exist?
    git.fs_mkdir(path)
    git.init(git_options)
  end

  self.new(path, repo_options)
end

Instance Method Details

#add(*files) ⇒ Object

Adds files to the index


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# File 'lib/grit/repo.rb', line 249

def add(*files)
  self.git.add({}, *files.flatten)
end

#alternatesObject

The list of alternates for this repo

Returns Array (pathnames of alternates)


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# File 'lib/grit/repo.rb', line 652

def alternates
  alternates_path = "objects/info/alternates"
  self.git.fs_read(alternates_path).strip.split("\n")
rescue Errno::ENOENT
  []
end

#alternates=(alts) ⇒ Object

Sets the alternates

+alts+ is the Array of String paths representing the alternates

Returns nothing


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# File 'lib/grit/repo.rb', line 663

def alternates=(alts)
  alts.each do |alt|
    unless File.exist?(alt)
      raise "Could not set alternates. Alternate path #{alt} must exist"
    end
  end

  if alts.empty?
    self.git.fs_write('objects/info/alternates', '')
  else
    self.git.fs_write('objects/info/alternates', alts.join("\n"))
  end
end

#archive_tar(treeish = 'master', prefix = nil) ⇒ Object

Archive the given treeish

+treeish+ is the treeish name/id (default 'master')
+prefix+ is the optional prefix

Examples

repo.archive_tar
# => <String containing tar archive>

repo.archive_tar('a87ff14')
# => <String containing tar archive for commit a87ff14>

repo.archive_tar('master', 'myproject/')
# => <String containing tar archive and prefixed with 'myproject/'>

Returns String (containing tar archive)


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# File 'lib/grit/repo.rb', line 587

def archive_tar(treeish = 'master', prefix = nil)
  options = {}
  options[:prefix] = prefix if prefix
  self.git.archive(options, treeish)
end

#archive_tar_gz(treeish = 'master', prefix = nil) ⇒ Object

Archive and gzip the given treeish

+treeish+ is the treeish name/id (default 'master')
+prefix+ is the optional prefix

Examples

repo.archive_tar_gz
# => <String containing tar.gz archive>

repo.archive_tar_gz('a87ff14')
# => <String containing tar.gz archive for commit a87ff14>

repo.archive_tar_gz('master', 'myproject/')
# => <String containing tar.gz archive and prefixed with 'myproject/'>

Returns String (containing tar.gz archive)


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# File 'lib/grit/repo.rb', line 608

def archive_tar_gz(treeish = 'master', prefix = nil)
  options = {}
  options[:prefix] = prefix if prefix
  self.git.archive(options, treeish, "| gzip -n")
end

#archive_to_file(treeish = 'master', prefix = nil, filename = 'archive.tar.gz', format = nil, pipe = "gzip") ⇒ Object

Write an archive directly to a file

+treeish+ is the treeish name/id (default 'master')
+prefix+ is the optional prefix (default nil)
+filename+ is the name of the file (default 'archive.tar.gz')
+format+ is the optional format (default nil)
+pipe+ is the command to run the output through (default 'gzip')

Returns nothing


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# File 'lib/grit/repo.rb', line 622

def archive_to_file(treeish = 'master', prefix = nil, filename = 'archive.tar.gz', format = nil, pipe = "gzip")
  options = {}
  options[:prefix] = prefix if prefix
  options[:format] = format if format
  self.git.archive(options, treeish, "| #{pipe} > #{filename}")
end

#batch(*shas) ⇒ Object

Public: Return the full Git objects from the given SHAs. Only Commit objects are parsed for now.

*shas - Array of String SHAs.

Returns an Array of Grit objects (Grit::Commit).


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# File 'lib/grit/repo.rb', line 168

def batch(*shas)
  shas.flatten!
  text = git.native(:cat_file, {:batch => true, :input => (shas * "\n")})
  parse_batch(text)
end

#blame(file, commit = nil) ⇒ Object


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# File 'lib/grit/repo.rb', line 204

def blame(file, commit = nil)
  Blame.new(self, file, commit)
end

#blame_tree(commit, path = nil) ⇒ Object


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# File 'lib/grit/repo.rb', line 259

def blame_tree(commit, path = nil)
  commit_array = self.git.blame_tree(commit, path)

  final_array = {}
  commit_array.each do |file, sha|
    final_array[file] = commit(sha)
  end
  final_array
end

#blob(id) ⇒ Object

The Blob object for the given id

+id+ is the SHA1 id of the blob

Returns Grit::Blob (unbaked)


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# File 'lib/grit/repo.rb', line 534

def blob(id)
  Blob.create(self, :id => id)
end

#commit(id) ⇒ Object

The Commit object for the specified id

+id+ is the SHA1 identifier of the commit

Returns Grit::Commit (baked)


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# File 'lib/grit/repo.rb', line 424

def commit(id)
  options = {:max_count => 1}

  Commit.find_all(self, id, options).first
end

#commit_all(message) ⇒ Object

Commits all tracked and modified files

Returns true/false if commit worked


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# File 'lib/grit/repo.rb', line 244

def commit_all(message)
  self.git.commit({}, '-a', '-m', message)
end

#commit_count(start = 'master') ⇒ Object

The number of commits reachable by the given branch/commit

+start+ is the branch/commit name (default 'master')

Returns Integer


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# File 'lib/grit/repo.rb', line 416

def commit_count(start = 'master')
  Commit.count(self, start)
end

#commit_deltas_from(other_repo, ref = "master", other_ref = "master") ⇒ Object

Returns a list of commits that is in other_repo but not in self

Returns Grit::Commit[]


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# File 'lib/grit/repo.rb', line 433

def commit_deltas_from(other_repo, ref = "master", other_ref = "master")
  # TODO: we should be able to figure out the branch point, rather than
  # rev-list'ing the whole thing
  repo_refs       = self.git.rev_list({}, ref).strip.split("\n")
  other_repo_refs = other_repo.git.rev_list({}, other_ref).strip.split("\n")

  (other_repo_refs - repo_refs).map do |refn|
    Commit.find_all(other_repo, refn, {:max_count => 1}).first
  end
end

#commit_diff(commit) ⇒ Object

The commit diff for the given commit

+commit+ is the commit name/id

Returns Grit::Diff[]


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# File 'lib/grit/repo.rb', line 568

def commit_diff(commit)
  Commit.diff(self, commit)
end

#commit_index(message) ⇒ Object

Commits current index

Returns true/false if commit worked


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# File 'lib/grit/repo.rb', line 237

def commit_index(message)
  self.git.commit({}, '-m', message)
end

#commit_objects(refs) ⇒ Object


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# File 'lib/grit/repo.rb', line 450

def commit_objects(refs)
  refs = refs.split(/\s+/) if refs.respond_to?(:to_str)
  self.git.rev_list({:timeout => false}, *refs).split("\n").map { |a| a[0, 40] }
end

#commit_stats(start = 'master', max_count = 10, skip = 0) ⇒ Object


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# File 'lib/grit/repo.rb', line 364

def commit_stats(start = 'master', max_count = 10, skip = 0)
  options = {:max_count => max_count,
             :skip => skip}

  CommitStats.find_all(self, start, options)
end

#commits(start = 'master', max_count = 10, skip = 0) ⇒ Object

An array of Commit objects representing the history of a given ref/commit

+start+ is the branch/commit name (default 'master')
+max_count+ is the maximum number of commits to return (default 10, use +false+ for all)
+skip+ is the number of commits to skip (default 0)

Returns Grit::Commit[] (baked)


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# File 'lib/grit/repo.rb', line 377

def commits(start = 'master', max_count = 10, skip = 0)
  options = {:max_count => max_count,
             :skip => skip}

  Commit.find_all(self, start, options)
end

#commits_between(from, to) ⇒ Object

The Commits objects that are reachable via to but not via from Commits are returned in chronological order.

+from+ is the branch/commit name of the younger item
+to+ is the branch/commit name of the older item

Returns Grit::Commit[] (baked)


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# File 'lib/grit/repo.rb', line 390

def commits_between(from, to)
  Commit.find_all(self, "#{from}..#{to}").reverse
end

#commits_since(start = 'master', since = '1970-01-01', extra_options = {}) ⇒ Object

The Commits objects that are newer than the specified date. Commits are returned in chronological order.

+start+ is the branch/commit name (default 'master')
+since+ is a string representing a date/time
+extra_options+ is a hash of extra options

Returns Grit::Commit[] (baked)


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# File 'lib/grit/repo.rb', line 406

def commits_since(start = 'master', since = '1970-01-01', extra_options = {})
  options = {:since => since}.merge(extra_options)

  Commit.find_all(self, start, options)
end

#configObject


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# File 'lib/grit/repo.rb', line 677

def config
  @config ||= Config.new(self)
end

#delete_ref(ref) ⇒ Object


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# File 'lib/grit/repo.rb', line 360

def delete_ref(ref)
  self.git.native(:update_ref, {:d => true}, ref)
end

#descriptionObject

The project's description. Taken verbatim from GIT_REPO/description

Returns String


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# File 'lib/grit/repo.rb', line 200

def description
  self.git.fs_read('description').chomp
end

#diff(a, b, *paths) ⇒ Object

The diff from commit a to commit b, optionally restricted to the given file(s)

+a+ is the base commit
+b+ is the other commit
+paths+ is an optional list of file paths on which to restrict the diff

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# File 'lib/grit/repo.rb', line 553

def diff(a, b, *paths)
  diff = self.git.native('diff', {}, a, b, '--', *paths)

  if diff =~ /diff --git a/
    diff = diff.sub(/.*?(diff --git a)/m, '\1')
  else
    diff = ''
  end
  Diff.list_from_string(self, diff)
end

#diff_objects(commit_sha, parents = true) ⇒ Object


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# File 'lib/grit/repo.rb', line 464

def diff_objects(commit_sha, parents = true)
  revs = []
  Grit.no_quote = true
  if parents
    # PARENTS:
    revs = self.git.diff_tree({:timeout => false, :r => true, :t => true, :m => true}, commit_sha).
      strip.split("\n").map{ |a| r = a.split(' '); r[3] if r[1] != '160000' }
  else
    # NO PARENTS:
    revs = self.git.native(:ls_tree, {:timeout => false, :r => true, :t => true}, commit_sha).
      split("\n").map{ |a| a.split("\t").first.split(' ')[2] }
  end
  revs << self.commit(commit_sha).tree.id
  Grit.no_quote = false
  return revs.uniq.compact
end

#disable_daemon_serveObject

Disable git-daemon serving of this repository by ensuring there is no git-daemon-export-ok file in its git directory

Returns nothing


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# File 'lib/grit/repo.rb', line 641

def disable_daemon_serve
  self.git.fs_delete(DAEMON_EXPORT_FILE)
end

#enable_daemon_serveObject

Enable git-daemon serving of this repository by writing the git-daemon-export-ok file to its git directory

Returns nothing


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# File 'lib/grit/repo.rb', line 633

def enable_daemon_serve
  self.git.fs_write(DAEMON_EXPORT_FILE, '')
end

#fast_forwardable?(to, from) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/grit/repo.rb', line 394

def fast_forwardable?(to, from)
  mb = self.git.native(:merge_base, {}, [to, from]).strip
  mb == from
end

#fork_bare(path, options = {}) ⇒ Object

Public: Create a bare fork of this repository.

path - The String full path of where to create the new fork.

Traditionally ends with "/<name>.git".

options - The Hash of additional options to the git clone command.

These options will be merged on top of the default Hash:
{:bare => true, :shared => true}.

Returns the newly forked Grit::Repo.


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# File 'lib/grit/repo.rb', line 137

def fork_bare(path, options = {})
  default_options = {:bare => true, :shared => true}
  real_options = default_options.merge(options)
  Git.new(path).fs_mkdir('..')
  self.git.clone(real_options, self.path, path)
  Repo.new(path)
end

#fork_bare_from(path, options = {}) ⇒ Object

Public: Fork a bare git repository from another repo.

path - The String full path of the repo from which to fork..

Traditionally ends with "/<name>.git".

options - The Hash of additional options to the git clone command.

These options will be merged on top of the default Hash:
{:bare => true, :shared => true}.

Returns the newly forked Grit::Repo.


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# File 'lib/grit/repo.rb', line 154

def fork_bare_from(path, options = {})
  default_options = {:bare => true, :shared => true}
  real_options = default_options.merge(options)
  Git.new(self.path).fs_mkdir('..')
  self.git.clone(real_options, path, self.path)
  Repo.new(self.path)
end

#gc_autoObject


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# File 'lib/grit/repo.rb', line 645

def gc_auto
  self.git.gc({:auto => true})
end

#get_head(head_name) ⇒ Object


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# File 'lib/grit/repo.rb', line 218

def get_head(head_name)
  heads.find { |h| h.name == head_name }
end

#headObject

Object reprsenting the current repo head.

Returns Grit::Head (baked)


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# File 'lib/grit/repo.rb', line 229

def head
  Head.current(self)
end

#headsObject Also known as: branches

An array of Head objects representing the branch heads in this repo

Returns Grit::Head[] (baked)


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# File 'lib/grit/repo.rb', line 212

def heads
  Head.find_all(self)
end

#indexObject


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# File 'lib/grit/repo.rb', line 681

def index
  Index.new(self)
end

#inspectObject

Pretty object inspection


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# File 'lib/grit/repo.rb', line 704

def inspect
  %Q{#<Grit::Repo "#{@path}">}
end

#is_head?(head_name) ⇒ Boolean

Returns:

  • (Boolean)

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# File 'lib/grit/repo.rb', line 222

def is_head?(head_name)
  get_head(head_name)
end

#log(commit = 'master', path = nil, options = {}) ⇒ Object

The commit log for a treeish

Returns Grit::Commit[]


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# File 'lib/grit/repo.rb', line 541

def log(commit = 'master', path = nil, options = {})
  default_options = {:pretty => "raw"}
  actual_options  = default_options.merge(options)
  arg = path ? [commit, '--', path] : [commit]
  commits = self.git.log(actual_options, *arg)
  Commit.list_from_string(self, commits)
end

#lstree(treeish = 'master', options = {}) ⇒ Object

quick way to get a simple array of hashes of the entries of a single tree or recursive tree listing from a given sha or reference

+treeish+ is the reference (default 'master')
+options+ is a hash or options - currently only takes :recursive

Examples

repo.lstree('master', :recursive => true)

Returns array of hashes - one per tree entry


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# File 'lib/grit/repo.rb', line 503

def lstree(treeish = 'master', options = {})
  # check recursive option
  opts = {:timeout => false, :l => true, :t => true}
  if options[:recursive]
    opts[:r] = true
  end
  # mode, type, sha, size, path
  revs = self.git.native(:ls_tree, opts, treeish)
  lines = revs.split("\n")
  revs = lines.map do |a|
    stuff, path = a.split("\t")
    mode, type, sha, size = stuff.split(" ")
    entry = {:mode => mode, :type => type, :sha => sha, :path => path}
    entry[:size] = size.strip.to_i if size.strip != '-'
    entry
  end
  revs
end

#object(sha) ⇒ Object


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# File 'lib/grit/repo.rb', line 522

def object(sha)
  obj = git.get_git_object(sha)
  raw = Grit::GitRuby::Internal::RawObject.new(obj[:type], obj[:content])
  object = Grit::GitRuby::GitObject.from_raw(raw)
  object.sha = sha
  object
end

#objects(refs) ⇒ Object


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# File 'lib/grit/repo.rb', line 444

def objects(refs)
  refs = refs.split(/\s+/) if refs.respond_to?(:to_str)
  self.git.rev_list({:objects => true, :timeout => false}, *refs).
    split("\n").map { |a| a[0, 40] }
end

#objects_between(ref1, ref2 = nil) ⇒ Object


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# File 'lib/grit/repo.rb', line 455

def objects_between(ref1, ref2 = nil)
  if ref2
    refs = "#{ref2}..#{ref1}"
  else
    refs = ref1
  end
  self.objects(refs)
end

#parse_batch(text) ⇒ Object

Parses `git cat-file –batch` output, returning an array of Grit objects.

text - Raw String output.

Returns an Array of Grit objects (Grit::Commit).


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# File 'lib/grit/repo.rb', line 179

def parse_batch(text)
  io = StringIO.new(text)
  objects = []
  while line = io.gets
    sha, type, size = line.split(" ", 3)
    parser = BATCH_PARSERS[type]
    if type == 'missing' || !parser
      io.seek(size.to_i + 1, IO::SEEK_CUR)
      objects << nil
      next
    end

    object   = io.read(size.to_i + 1)
    objects << parser.parse_batch(self, sha, size, object)
  end
  objects
end

#recent_tag_name(committish = nil, options = {}) ⇒ Object

Finds the most recent annotated tag name that is reachable from a commit.

@repo.recent_tag_name('master')
# => "v1.0-0-abcdef"

committish - optional commit SHA, branch, or tag name. options - optional hash of options to pass to git.

Default: {:always => true}
:tags => true      # use lightweight tags too.
:abbrev => Integer # number of hex digits to form the unique
  name.  Defaults to 7.
:long => true      # always output tag + commit sha
# see `git describe` docs for more options.

Returns the String tag name, or just the commit if no tag is found. If there have been updates since the tag was made, a suffix is added with the number of commits since the tag, and the abbreviated object name of the most recent commit. Returns nil if the committish value is not found.


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# File 'lib/grit/repo.rb', line 300

def recent_tag_name(committish = nil, options = {})
  value = git.describe({:always => true}.update(options), committish.to_s).to_s.strip
  value.size.zero? ? nil : value
end

#refsObject

An array of Ref objects representing the refs in this repo

Returns Grit::Ref[] (baked)


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# File 'lib/grit/repo.rb', line 345

def refs
  [ Head.find_all(self), Tag.find_all(self), Remote.find_all(self) ].flatten
end

#refs_listObject

returns an array of hashes representing all references


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# File 'lib/grit/repo.rb', line 350

def refs_list
  refs = self.git.for_each_ref
  refarr = refs.split("\n").map do |line|
    shatype, ref = line.split("\t")
    sha, type = shatype.split(' ')
    [ref, sha, type]
  end
  refarr
end

#remote_add(name, url) ⇒ Object


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# File 'lib/grit/repo.rb', line 317

def remote_add(name, url)
  self.git.remote({}, 'add', name, url)
end

#remote_fetch(name) ⇒ Object


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# File 'lib/grit/repo.rb', line 321

def remote_fetch(name)
  self.git.fetch({}, name)
end

#remote_listObject


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# File 'lib/grit/repo.rb', line 313

def remote_list
  self.git.list_remotes
end

#remotesObject

An array of Remote objects representing the remote branches in this repo

Returns Grit::Remote[] (baked)


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# File 'lib/grit/repo.rb', line 309

def remotes
  Remote.find_all(self)
end

#remotes_fetch_needed(remotes) ⇒ Object

takes an array of remote names and last pushed dates fetches from all of the remotes where the local fetch date is earlier than the passed date, then records the last fetched date

{ 'origin' => date,

'peter => date,

}


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# File 'lib/grit/repo.rb', line 333

def remotes_fetch_needed(remotes)
  remotes.each do |remote, date|
    # TODO: check against date
    self.remote_fetch(remote)
  end
end

#remove(*files) ⇒ Object

Remove files from the index


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# File 'lib/grit/repo.rb', line 254

def remove(*files)
  self.git.rm({}, *files.flatten)
end

#rename(name) ⇒ Object

Rename the current repository directory.

+name+ is the new name

Returns nothing


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# File 'lib/grit/repo.rb', line 695

def rename(name)
  if @bare
    self.git.fs_move('/', "../#{name}")
  else
    self.git.fs_move('/', "../../#{name}")
  end
end

#statusObject


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# File 'lib/grit/repo.rb', line 269

def status
  Status.new(self)
end

#tagsObject

An array of Tag objects that are available in this repo

Returns Grit::Tag[] (baked)


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# File 'lib/grit/repo.rb', line 277

def tags
  Tag.find_all(self)
end

#tree(treeish = 'master', paths = []) ⇒ Object

The Tree object for the given treeish reference

+treeish+ is the reference (default 'master')
+paths+ is an optional Array of directory paths to restrict the tree (default [])

Examples

repo.tree('master', ['lib/'])

Returns Grit::Tree (baked)


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# File 'lib/grit/repo.rb', line 489

def tree(treeish = 'master', paths = [])
  Tree.construct(self, treeish, paths)
end

#update_ref(head, commit_sha) ⇒ Object


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# File 'lib/grit/repo.rb', line 685

def update_ref(head, commit_sha)
  return nil if !commit_sha || (commit_sha.size != 40)
  self.git.fs_write("refs/heads/#{head}", commit_sha)
  commit_sha
end