diff options
Diffstat (limited to 'src/Text/Hakyll')
| -rw-r--r-- | src/Text/Hakyll/Tags.hs | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/src/Text/Hakyll/Tags.hs b/src/Text/Hakyll/Tags.hs index 7d2c9ea..10be45c 100644 --- a/src/Text/Hakyll/Tags.hs +++ b/src/Text/Hakyll/Tags.hs @@ -13,9 +13,25 @@ -- > The novel is set in a post-apocalyptic near future, where the Earth and -- > its populations have been damaged greatly by Nuclear... -- --- All the following functions would work with such a format. +-- All the following functions would work with such a format. In addition to +-- tags, Hakyll also supports categories. The convention when using categories +-- is to place pages in subdirectories. +-- +-- An example, the page @posts\/coding\/2010-01-28-hakyll-categories.markdown@ +-- would be placed under the `coding` category. +-- +-- Tags or categories are read using the @readTagMap@ and @readCategoryMap@ +-- functions. Because categories are implemented using tags - categories can +-- be seen as tags, with the restriction that a page can only have one +-- category - all functions for tags also work with categories. +-- +-- When reading a @TagMap@ (which is also used for category maps) using the +-- @readTagMap@ or @readCategoryMap@ function, you also have to give a unique +-- identifier to it. This identifier is simply for caching reasons, so Hakyll +-- can tell different maps apart; it has no other use. module Text.Hakyll.Tags - ( readTagMap + ( TagMap + , readTagMap , readCategoryMap , renderTagCloud , renderTagLinks @@ -39,13 +55,14 @@ import Text.Hakyll.Internal.Cache import Text.Hakyll.Internal.Template -- | Type for a tag map. +-- +-- This is a map associating tags or categories to the appropriate pages +-- using that tag or category. In the case of categories, each path will only +-- appear under one category - this is not the case with tags. type TagMap = M.Map String [PagePath] --- | Read a tag map. This creates a map from tags to page paths. --- --- You also have to give a unique identifier for every tagmap. This is for --- caching reasons, so the tagmap will be stored in --- @_cache/_tagmap/identifier@. +-- | Read a tag map. This is a internally used function that can be used for +-- tags as well as for categories. readMap :: (Context -> [String]) -- ^ Function to get tags from a context. -> String -- ^ Unique identifier for the tagmap. -> [PagePath] @@ -66,16 +83,18 @@ readMap getTagsFunction identifier paths = do addPaths' = flip (M.insertWith (++)) [path] return $ foldr addPaths' current tags -readTagMap :: String - -> [PagePath] +-- | Read a @TagMap@, using the @tags@ metadata field. +readTagMap :: String -- ^ Unique identifier for the map. + -> [PagePath] -- ^ Paths to get tags from. -> Hakyll TagMap readTagMap = readMap getTagsFunction where getTagsFunction = map trim . splitRegex "," . fromMaybe [] . M.lookup "tags" -readCategoryMap :: String - -> [PagePath] +-- | Read a @TagMap@, using the subdirectories the pages are placed in. +readCategoryMap :: String -- ^ Unique identifier for the map. + -> [PagePath] -- ^ Paths to get tags from. -> Hakyll TagMap readCategoryMap = readMap $ maybeToList . M.lookup "category" |