Support value/type namespaces on identifier links

Identifier links can be prefixed with a 'v' or 't' to indicate the value or
type namespace of the desired identifier. For example:

-- | Some link to a value: v'Data.Functor.Identity'
--
-- Some link to a type: t'Data.Functor.Identity'

The default is still the type (with a warning about the ambiguity)

4 files changed, 122 insertions, 0 deletions

diff --git a/latex-test/ref/NamespacedIdentifier/NamespacedIdentifiers.tex b/latex-test/ref/NamespacedIdentifier/NamespacedIdentifiers.tex
new file mode 100644
index 00000000..f39bd0ec
--- /dev/null
+++ b/latex-test/ref/NamespacedIdentifier/NamespacedIdentifiers.tex
@@ -0,0 +1,41 @@
+\haddockmoduleheading{NamespacedIdentifiers}
+\label{module:NamespacedIdentifiers}
+\haddockbeginheader
+{\haddockverb\begin{verbatim}
+module NamespacedIdentifiers (
+    Foo(Bar),  Bar
+  ) where\end{verbatim}}
+\haddockendheader
+
+\begin{haddockdesc}
+\item[\begin{tabular}{@{}l}
+data\ Foo
+\end{tabular}]\haddockbegindoc
+A link to:\par
+\begin{itemize}
+\item
+the type \haddockid{Bar}\par
+
+\item
+the constructor \haddockid{Bar}\par
+
+\item
+the unimported but qualified type \haddockid{A}\par
+
+\item
+the unimported but qualified value \haddockid{A}\par
+
+\end{itemize}
+
+\enspace \emph{Constructors}\par
+\haddockbeginconstrs
+\haddockdecltt{=} & \haddockdecltt{Bar} & \\
+\end{tabulary}\par
+\end{haddockdesc}
+\begin{haddockdesc}
+\item[\begin{tabular}{@{}l}
+data\ Bar
+\end{tabular}]\haddockbegindoc
+A link to the value \haddocktt{Foo} (which shouldn't exist).\par
+
+\end{haddockdesc}
\ No newline at end of file
diff --git a/latex-test/ref/NamespacedIdentifier/haddock.sty b/latex-test/ref/NamespacedIdentifier/haddock.sty
new file mode 100644
index 00000000..6e031a98
--- /dev/null
+++ b/latex-test/ref/NamespacedIdentifier/haddock.sty
@@ -0,0 +1,57 @@
+% Default Haddock style definitions.  To use your own style, invoke
+% Haddock with the option --latex-style=mystyle.
+
+\usepackage{tabulary} % see below
+
+% make hyperlinks in the PDF, and add an expandabale index
+\usepackage[pdftex,bookmarks=true]{hyperref}
+
+\newenvironment{haddocktitle}
+  {\begin{center}\bgroup\large\bfseries}
+  {\egroup\end{center}}
+\newenvironment{haddockprologue}{\vspace{1in}}{}
+
+\newcommand{\haddockmoduleheading}[1]{\chapter{\texttt{#1}}}
+
+\newcommand{\haddockbeginheader}{\hrulefill}
+\newcommand{\haddockendheader}{\noindent\hrulefill}
+
+% a little gap before the ``Methods'' header
+\newcommand{\haddockpremethods}{\vspace{2ex}}
+
+% inserted before \\begin{verbatim}
+\newcommand{\haddockverb}{\small}
+
+% an identifier: add an index entry
+\newcommand{\haddockid}[1]{\haddocktt{#1}\index{#1@\texttt{#1}}}
+
+% The tabulary environment lets us have a column that takes up ``the
+% rest of the space''.  Unfortunately it doesn't allow
+% the \end{tabulary} to be in the expansion of a macro, it must appear
+% literally in the document text, so Haddock inserts
+% the \end{tabulary} itself.
+\newcommand{\haddockbeginconstrs}{\begin{tabulary}{\linewidth}{@{}llJ@{}}}
+\newcommand{\haddockbeginargs}{\begin{tabulary}{\linewidth}{@{}llJ@{}}}
+
+\newcommand{\haddocktt}[1]{{\small \texttt{#1}}}
+\newcommand{\haddockdecltt}[1]{{\small\bfseries \texttt{#1}}}
+
+\makeatletter
+\newenvironment{haddockdesc}
+               {\list{}{\labelwidth\z@ \itemindent-\leftmargin
+                        \let\makelabel\haddocklabel}}
+               {\endlist}
+\newcommand*\haddocklabel[1]{\hspace\labelsep\haddockdecltt{#1}}
+\makeatother
+
+% after a declaration, start a new line for the documentation.
+% Otherwise, the documentation starts right after the declaration,
+% because we're using the list environment and the declaration is the
+% ``label''.  I tried making this newline part of the label, but
+% couldn't get that to work reliably (the space seemed to stretch
+% sometimes).
+\newcommand{\haddockbegindoc}{\hfill\\[1ex]}
+
+% spacing between paragraphs and no \parindent looks better
+\parskip=10pt plus2pt minus2pt
+\setlength{\parindent}{0cm}
diff --git a/latex-test/ref/NamespacedIdentifier/main.tex b/latex-test/ref/NamespacedIdentifier/main.tex
new file mode 100644
index 00000000..75493e12
--- /dev/null
+++ b/latex-test/ref/NamespacedIdentifier/main.tex
@@ -0,0 +1,11 @@
+\documentclass{book}
+\usepackage{haddock}
+\begin{document}
+\begin{titlepage}
+\begin{haddocktitle}
+
+\end{haddocktitle}
+\end{titlepage}
+\tableofcontents
+\input{NamespacedIdentifiers}
+\end{document}
\ No newline at end of file
diff --git a/latex-test/src/NamespacedIdentifier/NamespacedIdentifier.hs b/latex-test/src/NamespacedIdentifier/NamespacedIdentifier.hs
new file mode 100644
index 00000000..6f59d247
--- /dev/null
+++ b/latex-test/src/NamespacedIdentifier/NamespacedIdentifier.hs
@@ -0,0 +1,13 @@
+module NamespacedIdentifiers where
+
+-- | A link to:
+--
+--   * the type t'Bar'
+--   * the constructor v'Bar'
+--   * the unimported but qualified type t'A.A'
+--   * the unimported but qualified value v'A.A'
+--
+data Foo = Bar
+
+-- | A link to the value v'Foo' (which shouldn't exist).
+data Bar