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authorDaniel Gröber <dxld@darkboxed.org>2018-10-14 03:32:49 +0200
committerDaniel Gröber <dxld@darkboxed.org>2018-10-27 19:53:16 +0200
commit679c3145fb8fdc346880c205c9dde369e782feee (patch)
treee3d42ee09e5816448a33a212fadc63c540ca580e /src/CabalHelper/Compiletime/Types
parent807354f7dc6644fec15dfa1e534c69c14d219628 (diff)
Add stack support
Diffstat (limited to 'src/CabalHelper/Compiletime/Types')
-rw-r--r--src/CabalHelper/Compiletime/Types/RelativePath.hs39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/CabalHelper/Compiletime/Types/RelativePath.hs b/src/CabalHelper/Compiletime/Types/RelativePath.hs
new file mode 100644
index 0000000..bfc29bf
--- /dev/null
+++ b/src/CabalHelper/Compiletime/Types/RelativePath.hs
@@ -0,0 +1,39 @@
+-- cabal-helper: Simple interface to Cabal's configuration state
+-- Copyright (C) 2018 Daniel Gröber <cabal-helper@dxld.at>
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+{-|
+Module : CabalHelper.Compiletime.Types.RelativePath
+License : GPL-3
+-}
+
+module CabalHelper.Compiletime.Types.RelativePath
+ ( RelativePath
+ , mkRelativePath
+ , unRelativePath
+ ) where
+
+import System.FilePath
+
+-- | A path guaranteed to be relative. The constructor is not exposed, use the
+-- 'mkRelativePath' smart constructor.
+newtype RelativePath = RelativePath { unRelativePath :: FilePath }
+
+-- | Smart constructor for 'RelativePath'. Checks if the given path is absolute
+-- and throws 'UserError' if not.
+mkRelativePath :: FilePath -> RelativePath
+mkRelativePath dir
+ | isAbsolute dir = RelativePath dir
+ | otherwise = error "mkRelativePath: the path given was absolute!"