|This manages everything to do with where files get installed (though does
not get involved with actually doing any installation). It provides an
InstallDirs type which is a set of directories for where to install
things. It also handles the fact that we use templates in these install
dirs. For example most install dirs are relative to some $prefix and by
changing the prefix all other dirs still end up changed appropriately. So it
provides a PathTemplate type and functions for substituting for these
The directories where we will install files for packages.
We have several different directories for different types of files since
many systems have conventions whereby different types of files in a package
are installed in different direcotries. This is particularly the case on
unix style systems.
|prefix :: dir|
|bindir :: dir|
|libdir :: dir|
|libsubdir :: dir|
|dynlibdir :: dir|
|libexecdir :: dir|
|progdir :: dir|
|includedir :: dir|
|datadir :: dir|
|datasubdir :: dir|
|docdir :: dir|
|mandir :: dir|
|htmldir :: dir|
|haddockdir :: dir|
The installation directories in terms of PathTemplates that contain
The defaults for most of the directories are relative to each other, in
particular they are all relative to a single prefix. This makes it
convenient for the user to override the default installation directory
by only having to specify --prefix=... rather than overriding each
individually. This is done by allowing $-style variables in the dirs.
These are expanded by textual substituion (see substPathTemplate).
A few of these installation directories are split into two components, the
dir and subdir. The full installation path is formed by combining the two
together with /. The reason for this is compatibility with other unix
build systems which also support --libdir and --datadir. We would like
users to be able to configure --libdir=/usr/lib64 for example but
because by default we want to support installing multiple versions of
packages and building the same package for multiple compilers we append the
libsubdir to get: /usr/lib64/$pkgid/$compiler.
An additional complication is the need to support relocatable packages on
systems which support such things, like Windows.
|Convert from abstract install directories to actual absolute ones by
substituting for all the variables in the abstract paths, to get real
|The location prefix for the copy command.
Check which of the paths are relative to the installation $prefix.
If any of the paths are not relative, ie they are absolute paths, then it
prevents us from making a relocatable package (also known as a "prefix
Substitute the install dir templates into each other.
To prevent cyclic substitutions, only some variables are allowed in
particular dir templates. If out of scope vars are present, they are not
substituted for. Checking for any remaining unsubstituted vars can be done
as a subsequent operation.
The reason it is done this way is so that in prefixRelativeInstallDirs we
can replace prefix with the PrefixVar and get resulting
PathTemplates that still have the PrefixVar in them. Doing this makes it
each to check which paths are relative to the $prefix.
|An abstract path, posibly containing variables that need to be
substituted for to get a real FilePath.
|data PathTemplateVariable ||Source|
|PrefixVar||The $prefix path variable
|BindirVar||The $bindir path variable
|LibdirVar||The $libdir path variable
|LibsubdirVar||The $libsubdir path variable
|DatadirVar||The $datadir path variable
|DatasubdirVar||The $datasubdir path variable
|DocdirVar||The $docdir path variable
|HtmldirVar||The $htmldir path variable
|PkgNameVar||The $pkg package name path variable
|PkgVerVar||The $version package version path variable
|PkgIdVar||The $pkgid package Id path variable, eg foo-1.0
|CompilerVar||The compiler name and version, eg ghc-6.6.1
|OSVar||The operating system name, eg windows or linux
|ArchVar||The cpu architecture name, eg i386 or x86_64
|ExecutableNameVar||The executable name; used in shell wrappers
|Convert a FilePath to a PathTemplate including any template vars.
|Convert back to a path, any remaining vars are included
|The initial environment has all the static stuff but no paths
|Produced by Haddock version 2.6.0|