-module LWN.Article
+module LWN.Article (
+ Article(..),
+ Byline(..),
+ Title(..),
+ BodyHtml(..),
+ article_tests,
+ real_article_path
+ )
where
-import XHTML
+import Data.List (isPrefixOf)
+import System.Directory (doesFileExist)
+import Test.HUnit (Assertion, assertEqual)
+import Test.Framework (Test, testGroup)
+import Test.Framework.Providers.HUnit (testCase)
+import Text.Regex.Posix ((=~))
-data Article = Article { headline :: String,
- byline :: String,
- body_html :: String }
+import LWN.URI (
+ add_trailing_slash,
+ is_lwn_url,
+ try_make_absolute_url,
+ make_https)
+
+import LWN.XHTML (XHTML, to_xhtml)
+
+newtype Title = Title { getTitle :: String }
+newtype Byline = Byline { getByline :: Maybe String }
+newtype BodyHtml = BodyHtml { getBodyHtml :: String }
+
+instance Show Title where
+ show = getTitle
+
+instance Show Byline where
+ show (Byline (Just bl)) = bl
+ show (Byline Nothing ) = ""
+
+instance Show BodyHtml where
+ show = getBodyHtml
+
+instance XHTML Title where
+ to_xhtml (Title t) = "<h2>" ++ t ++ "</h2>"
+
+instance XHTML Byline where
+ to_xhtml (Byline (Just bl)) = "<p><em>" ++ bl ++ "</em></p>"
+ to_xhtml (Byline Nothing) = ""
+
+instance XHTML BodyHtml where
+ to_xhtml = getBodyHtml
+
+data Article = Article { title :: Title,
+ byline :: Byline,
+ body_html :: BodyHtml }
instance XHTML Article where
- to_xhtml (Article hl bl b) =
- "<h1>" ++ hl ++ "</h1>\n\n" ++
- "<h2>" ++ bl ++ "</h2>\n\n" ++
- b
+ to_xhtml (Article t bl b) =
+ (to_xhtml t) ++
+ (to_xhtml bl) ++
+ (to_xhtml b)
+
+
+
+-- | Convert the given article to either a URL or a filesystem
+-- path. If the given article exists on the filesystem, we assume
+-- it's a file. Otherwise, we check to see if it's a URL. Failing
+-- that, we try to construct a URL from what we're given and do our
+-- best.
+real_article_path :: String -> IO String
+real_article_path path = do
+ is_file <- doesFileExist path
+ return $ if is_file then path else add_trailing_slash check_cases
+ where
+ abs_current = try_make_absolute_url ("/" ++ path)
+ abs_article = try_make_absolute_url ("Articles/" ++ path)
+
+ check_cases :: String
+ check_cases
+ | is_lwn_url path = make_https path
+ | isPrefixOf "current" path = abs_current
+ | path =~ "^[0-9]+$" = abs_article
+ | otherwise = path -- Give up
+
+
+
+test_current_article_path :: Assertion
+test_current_article_path = do
+ let expected = "https://lwn.net/current/"
+ actual <- real_article_path "current"
+ assertEqual "Current article path constructed" expected actual
+
+test_current_bigpage_article_path :: Assertion
+test_current_bigpage_article_path = do
+ let expected = "https://lwn.net/current/bigpage"
+ actual <- real_article_path "current/bigpage"
+ assertEqual "Current bigpage article path constructed" expected actual
+
+test_numbered_article_path :: Assertion
+test_numbered_article_path = do
+ let expected = "https://lwn.net/Articles/69/"
+ actual <- real_article_path "69" -- I'm twelve
+ assertEqual "Numbered article path constructed" expected actual
+
+
+test_full_article_path :: Assertion
+test_full_article_path = do
+ let expected = "https://lwn.net/Articles/502979/"
+ actual <- real_article_path "https://lwn.net/Articles/502979/"
+ assertEqual "Full article path left alone" expected actual
+
+test_non_https_article_path :: Assertion
+test_non_https_article_path = do
+ let expected = "https://lwn.net/Articles/502979/"
+ actual <- real_article_path "http://lwn.net/Articles/502979/"
+ assertEqual "Non-https URL made https" expected actual
+
+article_tests :: Test
+article_tests =
+ testGroup "Article Tests" [
+ testCase "Current article path constructed" test_current_article_path,
+ testCase
+ "Current bigpage article path constructed"
+ test_current_bigpage_article_path,
+ testCase "Numbered article path constructed" test_numbered_article_path,
+ testCase "Full article path left alone" test_full_article_path,
+ testCase "Non-https URL made https" test_non_https_article_path ]