doc: add description about re-opening closed heads to 'Head, closed branch' in glossary

mercurial/help/glossary.txt

@@ -1,404 +1,407 b''
 Ancestor
     Any changeset that can be reached by an unbroken chain of parent
     changesets from a given changeset. More precisely, the ancestors
     of a changeset can be defined by two properties: a parent of a
     changeset is an ancestor, and a parent of an ancestor is an
     ancestor. See also: 'Descendant'.
 
 Bookmark
     Bookmarks are pointers to certain commits that move when
     committing. They are similar to tags in that it is possible to use
     bookmark names in all places where Mercurial expects a changeset
     ID, e.g., with :hg:`update`. Unlike tags, bookmarks move along
     when you make a commit.
 
     Bookmarks can be renamed, copied and deleted. Bookmarks are local,
     unless they are explicitly pushed or pulled between repositories.
     Pushing and pulling bookmarks allow you to collaborate with others
     on a branch without creating a named branch.
 
 Branch
     (Noun) A child changeset that has been created from a parent that
     is not a head. These are known as topological branches, see
     'Branch, topological'. If a topological branch is named, it becomes
     a named branch. If a topological branch is not named, it becomes
     an anonymous branch. See 'Branch, anonymous' and 'Branch, named'.
 
     Branches may be created when changes are pulled from or pushed to
     a remote repository, since new heads may be created by these
     operations. Note that the term branch can also be used informally
     to describe a development process in which certain development is
     done independently of other development. This is sometimes done
     explicitly with a named branch, but it can also be done locally,
     using bookmarks or clones and anonymous branches.
 
     Example: "The experimental branch".
 
     (Verb) The action of creating a child changeset which results in
     its parent having more than one child.
 
     Example: "I'm going to branch at X".
 
 Branch, anonymous
     Every time a new child changeset is created from a parent that is not
     a head and the name of the branch is not changed, a new anonymous
     branch is created.
 
 Branch, closed
     A named branch whose branch heads have all been closed.
 
 Branch, default
     The branch assigned to a changeset when no name has previously been
     assigned.
 
 Branch head
     See 'Head, branch'.
 
 Branch, inactive
     If a named branch has no topological heads, it is considered to be
     inactive. As an example, a feature branch becomes inactive when it
     is merged into the default branch. The :hg:`branches` command
     shows inactive branches by default, though they can be hidden with
     :hg:`branches --active`.
 
     NOTE: this concept is deprecated because it is too implicit.
     Branches should now be explicitly closed using :hg:`commit
     --close-branch` when they are no longer needed.
 
 Branch, named
     A collection of changesets which have the same branch name. By
     default, children of a changeset in a named branch belong to the
     same named branch. A child can be explicitly assigned to a
     different branch. See :hg:`help branch`, :hg:`help branches` and
     :hg:`commit --close-branch` for more information on managing
     branches.
 
     Named branches can be thought of as a kind of namespace, dividing
     the collection of changesets that comprise the repository into a
     collection of disjoint subsets. A named branch is not necessarily
     a topological branch. If a new named branch is created from the
     head of another named branch, or the default branch, but no
     further changesets are added to that previous branch, then that
     previous branch will be a branch in name only.
 
 Branch tip
     See 'Tip, branch'.
 
 Branch, topological
     Every time a new child changeset is created from a parent that is
     not a head, a new topological branch is created. If a topological
     branch is named, it becomes a named branch. If a topological
     branch is not named, it becomes an anonymous branch of the
     current, possibly default, branch.
 
 Changelog
     A record of the changesets in the order in which they were added
     to the repository. This includes details such as changeset id,
     author, commit message, date, and list of changed files.
 
 Changeset
     A snapshot of the state of the repository used to record a change.
 
 Changeset, child
     The converse of parent changeset: if P is a parent of C, then C is
     a child of P. There is no limit to the number of children that a
     changeset may have.
 
 Changeset id
     A SHA-1 hash that uniquely identifies a changeset. It may be
     represented as either a "long" 40 hexadecimal digit string, or a
     "short" 12 hexadecimal digit string.
 
 Changeset, merge
     A changeset with two parents. This occurs when a merge is
     committed.
 
 Changeset, parent
     A revision upon which a child changeset is based. Specifically, a
     parent changeset of a changeset C is a changeset whose node
     immediately precedes C in the DAG. Changesets have at most two
     parents.
 
 Checkout
     (Noun) The working directory being updated to a specific
     revision. This use should probably be avoided where possible, as
     changeset is much more appropriate than checkout in this context.
 
     Example: "I'm using checkout X."
 
     (Verb) Updating the working directory to a specific changeset. See
     :hg:`help update`.
 
     Example: "I'm going to check out changeset X."
 
 Child changeset
     See 'Changeset, child'.
 
 Close changeset
     See 'Head, closed branch'
 
 Closed branch
     See 'Branch, closed'.
 
 Clone
     (Noun) An entire or partial copy of a repository. The partial
     clone must be in the form of a revision and its ancestors.
 
     Example: "Is your clone up to date?".
 
     (Verb) The process of creating a clone, using :hg:`clone`.
 
     Example: "I'm going to clone the repository".
 
 Closed branch head
     See 'Head, closed branch'.
 
 Commit
     (Noun) A synonym for changeset.
 
     Example: "Is the bug fixed in your recent commit?"
 
     (Verb) The act of recording changes to a repository. When files
     are committed in a working directory, Mercurial finds the
     differences between the committed files and their parent
     changeset, creating a new changeset in the repository.
 
     Example: "You should commit those changes now."
 
 Cset
     A common abbreviation of the term changeset.
 
 DAG
     The repository of changesets of a distributed version control
     system (DVCS) can be described as a directed acyclic graph (DAG),
     consisting of nodes and edges, where nodes correspond to
     changesets and edges imply a parent -> child relation. This graph
     can be visualized by graphical tools such as :hg:`glog`
     (graphlog). In Mercurial, the DAG is limited by the requirement
     for children to have at most two parents.
 
 Default branch
     See 'Branch, default'.
 
 Descendant
     Any changeset that can be reached by a chain of child changesets
     from a given changeset. More precisely, the descendants of a
     changeset can be defined by two properties: the child of a
     changeset is a descendant, and the child of a descendant is a
     descendant. See also: 'Ancestor'.
 
 Diff
     (Noun) The difference between the contents and attributes of files
     in two changesets or a changeset and the current working
     directory. The difference is usually represented in a standard
     form called a "diff" or "patch". The "git diff" format is used
     when the changes include copies, renames, or changes to file
     attributes, none of which can be represented/handled by classic
     "diff" and "patch".
 
     Example: "Did you see my correction in the diff?"
 
     (Verb) Diffing two changesets is the action of creating a diff or
     patch.
 
     Example: "If you diff with changeset X, you will see what I mean."
 
 Directory, working
     The working directory represents the state of the files tracked by
     Mercurial, that will be recorded in the next commit. The working
     directory initially corresponds to the snapshot at an existing
     changeset, known as the parent of the working directory. See
     'Parent, working directory'. The state may be modified by changes
     to the files introduced manually or by a merge. The repository
     metadata exists in the .hg directory inside the working directory.
 
 Draft
     Changesets in the draft phase have not been shared with publishing
     repositories and may thus be safely changed by history-modifying
     extensions. See :hg:`help phases`.
 
 Graph
     See DAG and :hg:`help graphlog`.
 
 Head
     The term 'head' may be used to refer to both a branch head or a
     repository head, depending on the context. See 'Head, branch' and
     'Head, repository' for specific definitions.
 
     Heads are where development generally takes place and are the
     usual targets for update and merge operations.
 
 Head, branch
     A changeset with no descendants on the same named branch.
 
 Head, closed branch
     A changeset that marks a head as no longer interesting. The closed
     head is no longer listed by :hg:`heads`. A branch is considered
     closed when all its heads are closed and consequently is not
     listed by :hg:`branches`.
 
+    Closed heads can be re-opened by committing new changeset as the
+    child of the changeset that marks a head as closed.
+
 Head, repository
     A topological head which has not been closed.
 
 Head, topological
     A changeset with no children in the repository.
 
 History, immutable
     Once committed, changesets cannot be altered.  Extensions which
     appear to change history actually create new changesets that
     replace existing ones, and then destroy the old changesets. Doing
     so in public repositories can result in old changesets being
     reintroduced to the repository.
 
 History, rewriting
     The changesets in a repository are immutable. However, extensions
     to Mercurial can be used to alter the repository, usually in such
     a way as to preserve changeset contents.
 
 Immutable history
     See 'History, immutable'.
 
 Merge changeset
     See 'Changeset, merge'.
 
 Manifest
     Each changeset has a manifest, which is the list of files that are
     tracked by the changeset.
 
 Merge
     Used to bring together divergent branches of work. When you update
     to a changeset and then merge another changeset, you bring the
     history of the latter changeset into your working directory. Once
     conflicts are resolved (and marked), this merge may be committed
     as a merge changeset, bringing two branches together in the DAG.
 
 Named branch
     See 'Branch, named'.
 
 Null changeset
     The empty changeset. It is the parent state of newly-initialized
     repositories and repositories with no checked out revision. It is
     thus the parent of root changesets and the effective ancestor when
     merging unrelated changesets. Can be specified by the alias 'null'
     or by the changeset ID '000000000000'.
 
 Parent
     See 'Changeset, parent'.
 
 Parent changeset
     See 'Changeset, parent'.
 
 Parent, working directory
     The working directory parent reflects a virtual revision which is
     the child of the changeset (or two changesets with an uncommitted
     merge) shown by :hg:`parents`. This is changed with
     :hg:`update`. Other commands to see the working directory parent
     are :hg:`summary` and :hg:`id`. Can be specified by the alias ".".
 
 Patch
     (Noun) The product of a diff operation.
 
     Example: "I've sent you my patch."
 
     (Verb) The process of using a patch file to transform one
     changeset into another.
 
     Example: "You will need to patch that revision."
 
 Phase
     A per-changeset state tracking how the changeset has been or
     should be shared. See :hg:`help phases`.
 
 Public
     Changesets in the public phase have been shared with publishing
     repositories and are therefore considered immutable. See :hg:`help
     phases`.
 
 Pull
     An operation in which changesets in a remote repository which are
     not in the local repository are brought into the local
     repository. Note that this operation without special arguments
     only updates the repository, it does not update the files in the
     working directory. See :hg:`help pull`.
 
 Push
     An operation in which changesets in a local repository which are
     not in a remote repository are sent to the remote repository. Note
     that this operation only adds changesets which have been committed
     locally to the remote repository. Uncommitted changes are not
     sent. See :hg:`help push`.
 
 Repository
     The metadata describing all recorded states of a collection of
     files. Each recorded state is represented by a changeset. A
     repository is usually (but not always) found in the ``.hg``
     subdirectory of a working directory. Any recorded state can be
     recreated by "updating" a working directory to a specific
     changeset.
 
 Repository head
     See 'Head, repository'.
 
 Revision
     A state of the repository at some point in time. Earlier revisions
     can be updated to by using :hg:`update`.  See also 'Revision
     number'; See also 'Changeset'.
 
 Revision number
     This integer uniquely identifies a changeset in a specific
     repository. It represents the order in which changesets were added
     to a repository, starting with revision number 0. Note that the
     revision number may be different in each clone of a repository. To
     identify changesets uniquely between different clones, see
     'Changeset id'.
 
 Revlog
     History storage mechanism used by Mercurial. It is a form of delta
     encoding, with occasional full revision of data followed by delta
     of each successive revision. It includes data and an index
     pointing to the data.
 
 Rewriting history
     See 'History, rewriting'.
 
 Root
     A changeset that has only the null changeset as its parent. Most
     repositories have only a single root changeset.
 
 Secret
     Changesets in the secret phase may not be shared via push, pull,
     or clone. See :hg:`help phases`.
 
 Tag
     An alternative name given to a changeset. Tags can be used in all
     places where Mercurial expects a changeset ID, e.g., with
     :hg:`update`. The creation of a tag is stored in the history and
     will thus automatically be shared with other using push and pull.
 
 Tip
     The changeset with the highest revision number. It is the changeset
     most recently added in a repository.
 
 Tip, branch
     The head of a given branch with the highest revision number. When
     a branch name is used as a revision identifier, it refers to the
     branch tip. See also 'Branch, head'. Note that because revision
     numbers may be different in different repository clones, the
     branch tip may be different in different cloned repositories.
 
 Update
     (Noun) Another synonym of changeset.
 
     Example: "I've pushed an update".
 
     (Verb) This term is usually used to describe updating the state of
     the working directory to that of a specific changeset. See
     :hg:`help update`.
 
     Example: "You should update".
 
 Working directory
     See 'Directory, working'.
 
 Working directory parent
     See 'Parent, working directory'.