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Bryan O'Sullivan committed a0f57b3

More concepts, this time working directory stuff.

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 	tour-merge-conflict.svg \
 	tour-merge-merge.svg \
 	tour-merge-pull.svg \
-	tour-merge-sep-repos.svg
+	tour-merge-sep-repos.svg \
+	wdir.svg \
+	wdir-after-commit.svg
 
 image-svg := $(filter %.svg,$(image-sources))
 
 
 \section{The working directory}
 
-Mercurial's good ideas are not confined to the repository; it also
-needs to manage the working directory.  The \emph{dirstate} contains
-Mercurial's knowledge of the working directory.  This details which
-revision(s) the working directory is updated to, and all files that
-Mercurial is tracking in the working directory.
+In the working directory, Mercurial stores a snapshot of the files
+from the repository as of a particular changeset.
+
+The working directory ``knows'' which changeset it contains.  When you
+update the working directory to contain a particular changeset,
+Mercurial looks up the appropriate revision of the manifest to find
+out which files it was tracking at the time that changeset was
+committed, and which revision of each file was then current.  It then
+recreates a copy of each of those files, with the same contents it had
+when the changeset was committed.
+
+The \emph{dirstate} contains Mercurial's knowledge of the working
+directory.  This details which changeset the working directory is
+updated to, and all of the files that Mercurial is tracking in the
+working directory.
+
+Just as a revision of a revlog has room for two parents, so that it
+can represent either a normal revision (with one parent) or a merge of
+two earlier revisions, the dirstate has slots for two parents.  When
+you use the \hgcmd{update} command, the changeset that you update to
+is stored in the ``first parent'' slot, and the null ID in the second.
+When you \hgcmd{merge} with another changeset, the first parent
+remains unchanged, and the second parent is filled in with the
+changeset you're merging with.  The \hgcmd{parents} command tells you
+what the parents of the dirstate are.
+
+\subsection{What happens when you commit}
+
+The dirstate stores parent information for more than just book-keeping
+purposes.  Mercurial uses the parents of the dirstate as \emph{the
+  parents of a new changeset} when you perform a commit.
+
+\begin{figure}[ht]
+  \centering
+  \grafix{wdir}
+  \caption{The working directory can have two parents}
+  \label{fig:concepts:wdir}
+\end{figure}
+
+Figure~\ref{fig:concepts:wdir} shows the normal state of the working
+directory, where it has a single changeset as parent.  That changeset
+is the \emph{tip}, the newest changeset in the repository that has no
+children.
+
+\begin{figure}[ht]
+  \centering
+  \grafix{wdir-after-commit}
+  \caption{The working directory gains new parents after a commit}
+  \label{fig:concepts:wdir-after-commit}
+\end{figure}
+
+It's useful to think of the working directory as ``the changeset I'm
+about to commit''.  Any files that you tell Mercurial that you've
+added, removed, renamed, or copied will be reflected in that
+changeset, as will modifications to any files that Mercurial is
+already tracking; the new changeset will have the parents of the
+working directory as its parents.
+
+After a commit, Mercurial will update the parents of the working
+directory, so that the first parent is the ID of the new changeset,
+and the second is the null ID.  This is illustrated in
+figure~\ref{fig:concepts:wdir-after-commit}.
+
+\subsection{Other contents of the dirstate}
 
 Because Mercurial doesn't force you to tell it when you're modifying a
 file, it uses the dirstate to store some extra information so it can
 in the working directory, it stores the time that it last modified the
 file itself, and the size of the file at that time.  
 
+When you explicitly \hgcmd{add}, \hgcmd{remove}, \hgcmd{rename} or
+\hgcmd{copy} files, the dirstate is updated each time.
+
 When Mercurial is checking the states of files in the working
 directory, it first checks a file's modification time.  If that has
 not changed, the file must not have been modified.  If the file's size

en/wdir-after-commit.svg

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