Factor Analysis into own module

4 files changed, 338 insertions, 262 deletions

diff --git a/Alpha.hs b/Alpha.hs
index 6245614..1da1f1a 100644
--- a/Alpha.hs
+++ b/Alpha.hs
@@ -66,6 +66,7 @@ module Alpha
     -- * String
     capitalize,
     lowercase,
+    strip,
 
     -- * Lists
     list,
@@ -184,6 +185,10 @@ _ ?+ [] = panic "wutlus: empty cond list"
 (?<) :: Bool -> (Bool -> Text -> a) -> Text -> a
 a ?< f = if not a then f a else panic "wutgal failed"
 
+-- | Removes newlinse from a string.
+strip :: String -> String
+strip = filter (/= '\n')
+
 -- | Removes newlines from text.
 chomp :: Text -> Text
 chomp = Text.filter (/= '\n')
diff --git a/Biz/Cli.hs b/Biz/Cli.hs
index 05d81ac..0054e26 100644
--- a/Biz/Cli.hs
+++ b/Biz/Cli.hs
@@ -11,7 +11,9 @@ module Biz.Cli
     Docopt.docopt,
     Docopt.getAllArgs,
     Docopt.getArg,
+    Docopt.getArgWithDefault,
     Docopt.longOption,
+    Docopt.shortOption,
     Docopt.command,
     has,
   )
diff --git a/Biz/Devalloc.hs b/Biz/Devalloc.hs
index d9cf840..9eea33d 100644
--- a/Biz/Devalloc.hs
+++ b/Biz/Devalloc.hs
@@ -61,6 +61,8 @@ import Alpha hiding (rem, (<.>))
 import qualified Biz.App as App
 import qualified Biz.Auth as Auth
 import qualified Biz.Cli as Cli
+import Biz.Devalloc.Analysis (Analysis (..), Commit (..))
+import qualified Biz.Devalloc.Analysis as Analysis
 import qualified Biz.Id as Id
 import qualified Biz.Log as Log
 import qualified Biz.Look
@@ -89,12 +91,10 @@ import qualified Data.Map as Map
 import Data.SafeCopy (base, deriveSafeCopy, extension)
 import qualified Data.SafeCopy as SafeCopy
 import qualified Data.Set as Set
-import qualified Data.String as String
 import qualified Data.Text as Text
 import qualified Data.Text.Encoding as Encoding
 import qualified Data.Time.Calendar as Time
 import qualified Data.Time.Clock as Time
-import qualified Data.Time.Format as Time
 import Data.Vector (Vector)
 import qualified Data.Vector as Vector
 -- import qualified Data.Vector.Algorithms.Intro as Vector
@@ -201,6 +201,7 @@ data User0 = User0
   }
   deriving (Eq, Data, Typeable, Ord, Generic, Show)
 
+$(deriveSafeCopy 0 'base ''Id.Id)
 $(deriveSafeCopy 0 'base ''User0)
 
 -- | The main representation of a user.
@@ -242,9 +243,6 @@ instance Indexable User where
         ixFun <| \User {..} -> [userSubscription]
       ]
 
-newtype Commit = Sha Text
-  deriving (Eq, Data, Typeable, Ord, Generic, Show)
-
 instance Lucid.ToHtml Commit where
   toHtmlRaw = Lucid.toHtml
   toHtml (Sha txt) = Lucid.toHtml txt
@@ -269,84 +267,13 @@ data Visibility = Public | Private
 
 $(deriveSafeCopy 0 'base ''Visibility)
 
-data Analysis0 = Analysis0
-  { analysisId :: Id.Id Analysis0,
-    url :: URL,
-    bareRepo :: FilePath,
-    repoVisibility :: Visibility,
-    blackholes :: [Text],
-    liabilities :: [Text],
-    stale :: [(FilePath, Int)],
-    score :: Integer,
-    totalFiles :: Integer,
-    activeAuthors :: [Text],
-    commit :: Commit,
-    askedBy :: Id.Id User
-  }
-  deriving (Eq, Ord, Generic, Show, Data, Typeable)
-
-$(deriveSafeCopy 0 'base ''Analysis0)
-
--- | The result of analyzing a git repo.
-data Analysis = Analysis
-  { -- | Monotonic incrementing integer id
-    analysisId :: Id.Id Analysis,
-    -- | Canonical URL for the repo. I wish this was structured data instead of
-    -- just Text.
-    url :: URL,
-    -- | Where the repo is stored on the local disk.
-    bareRepo :: FilePath,
-    -- | If the repo is OSS or not
-    repoVisibility :: Visibility,
-    -- | A path with no active contributors
-    blackholes :: [Text],
-    -- | A path with < 3 active contributors
-    liabilities :: [Text],
-    -- | Map of path to number of commits, for detecting paths that continually
-    -- get rewritten.
-    hotspotMap :: Map FilePath Integer,
-    -- | Files that have not been touched in 6 months
-    stale :: [(FilePath, Integer)],
-    -- | Total score for the repo
-    score :: Integer,
-    -- | Total number of files
-    totalFiles :: Integer,
-    -- | The total number of commits
-    totalCommits :: Integer,
-    -- | List of all the active users we care about
-    activeAuthors :: [Text],
-    -- | Which commit this analysis was run against.
-    commit :: Commit,
-    -- | Who asked for this analysis
-    askedBy :: Id.Id User
-  }
-  deriving (Eq, Ord, Generic, Show, Data, Typeable)
-
-instance SafeCopy.Migrate Analysis where
-  type MigrateFrom Analysis = Analysis0
-  migrate Analysis0 {..} =
-    Analysis
-      { analysisId = Id.mk (Proxy :: Proxy Analysis) <| Id.untag analysisId,
-        hotspotMap = mempty,
-        totalCommits = 0,
-        stale = map (second toInteger) stale,
-        ..
-      }
-
-$(deriveSafeCopy 0 'base ''Id.Id)
-$(deriveSafeCopy 0 'base ''Analysis)
-
 instance Indexable Analysis where
   empty =
     ixSet
-      [ ixFun <| \Analysis {..} -> [analysisId],
-        ixFun <| \Analysis {..} -> [askedBy],
-        ixFun <| \Analysis {..} -> [url],
-        ixFun <| \Analysis {..} -> [commit],
-        ixFun <| \Analysis {..} -> [repoVisibility]
+      [ ixFun <| \Analysis {..} -> [commit]
       ]
 
-instance App.HasCss Analysis where
+instance App.HasCss AnalysisAction where
   cssFor _ = do
     "#analysis > *" ? do
       Biz.Look.marginAll (rem 2)
@@ -399,14 +326,13 @@ instance App.HasCss Analysis where
       ".bar" ? do
         Clay.height (px 800)
 
-instance Lucid.ToHtml Analysis where
+instance Lucid.ToHtml AnalysisAction where
   toHtmlRaw = Lucid.toHtml
-  toHtml Analysis {..} =
+  toHtml AnalysisAction {..} =
     Lucid.div_ [Lucid.id_ "analysis"] <| do
+      let Analysis {..} = analysis
       Lucid.p_ [Lucid.class_ "analysisFor"] <| do
-        "Analysis for "
-        Lucid.a_ [Lucid.href_ <| (\(URL txt) -> txt) <| url] <| do
-          Lucid.toHtml url
+        "Analysis for " <> Lucid.toHtml gitDir
 
       score_ <| do
         title_ "Total Score"
@@ -488,8 +414,8 @@ instance Lucid.ToHtml Analysis where
 
       score_ <| do
         title_ "Stale files"
-        quantity_ <| Lucid.toHtml <| slen stale
-        previewChart <| simpleBar (len stale) totalFiles
+        quantity_ <| Lucid.toHtml <| tshow <| Map.size stale
+        previewChart <| simpleBar (Map.size stale) totalFiles
         Lucid.details_ <| do
           Lucid.summary_ "Details"
           desc
@@ -505,7 +431,8 @@ instance Lucid.ToHtml Analysis where
             documentation practices along the way.
             |]
           Lucid.ul_ <| do
-            forM_ stale <| \(path, days) ->
+            -- probably Map.mapWithKey is better?
+            forM_ (Map.toList stale) <| \(path, days) ->
               Lucid.li_ <| Lucid.toHtml <| path <> " (" <> show days <> " days)"
 
       Lucid.with score_ [Lucid.id_ "hotspots"] <| do
@@ -540,7 +467,7 @@ instance Lucid.ToHtml Analysis where
                     <| Lucid.toHtml
                     <| path <> ": " <> show n <> " commits"
     where
-      simpleBar :: Monad m => Integer -> Integer -> Lucid.HtmlT m ()
+      simpleBar :: (Show i, Monad m, Num i) => i -> Integer -> Lucid.HtmlT m ()
       simpleBar n total = do
         Lucid.table_ [Lucid.class_ "charts-css bar stacked multiple"] <| do
           Lucid.tr_ <| do
@@ -560,12 +487,41 @@ instance Lucid.ToHtml Analysis where
       desc :: Monad m => Text -> Lucid.HtmlT m ()
       desc = Lucid.p_ <. Cmark.renderNode [] <. Cmark.commonmarkToNode []
 
+-- | Captures an 'Analysis' with metadata used in the webapp to track who asked
+-- it and so on.
+data AnalysisAction = AnalysisAction
+  { -- | Monotonic incrementing integer id
+    analysisId :: Id.Id AnalysisAction,
+    -- | Who asked for this analysis
+    askedBy :: Id.Id User,
+    -- | Where is this coming from?
+    url :: URL,
+    -- | Is the URL publically visible?
+    repoVisibility :: Visibility,
+    -- | The actual analaysis
+    analysis :: Analysis
+  }
+  deriving (Eq, Ord, Generic, Show, Data, Typeable)
+
+$(deriveSafeCopy 0 'base ''Analysis)
+$(deriveSafeCopy 0 'base ''AnalysisAction)
+
+instance Indexable AnalysisAction where
+  empty =
+    ixSet
+      [ ixFun <| \AnalysisAction {..} -> [analysisId],
+        ixFun <| \AnalysisAction {..} -> [askedBy],
+        ixFun <| \AnalysisAction {..} -> [url],
+        ixFun <| \AnalysisAction {..} -> [repoVisibility],
+        ixFun <| \AnalysisAction {..} -> [commit analysis]
+      ]
+
 -- | The database.
 data Keep = Keep
   { users :: IxSet User,
     nextUserId :: Id.Id User,
-    analyses :: IxSet Analysis,
-    nextAnalysisId :: Id.Id Analysis
+    analyses :: IxSet AnalysisAction,
+    nextAnalysisId :: Id.Id AnalysisAction
   }
   deriving (Data, Typeable)
 
@@ -603,10 +559,10 @@ getUsers = do
   Keep {..} <- ask
   pure <| IxSet.toList users
 
-createAnalysis :: Analysis -> Acid.Update Keep Analysis
+createAnalysis :: AnalysisAction -> Acid.Update Keep AnalysisAction
 createAnalysis a = do
   keep@Keep {..} <- get
-  let newAnalysis = a {analysisId = nextAnalysisId} :: Analysis
+  let newAnalysis = a {analysisId = nextAnalysisId} :: AnalysisAction
   put
     <| keep
       { analyses = IxSet.insert newAnalysis analyses,
@@ -614,27 +570,27 @@ createAnalysis a = do
       }
   pure newAnalysis
 
-getAnalysisById :: Id.Id Analysis -> Acid.Query Keep (Maybe Analysis)
+getAnalysisById :: Id.Id AnalysisAction -> Acid.Query Keep (Maybe AnalysisAction)
 getAnalysisById id = do
   Keep {..} <- ask
   pure <| IxSet.getOne <| analyses @= id
 
-getAllAnalyses :: Acid.Query Keep [Analysis]
+getAllAnalyses :: Acid.Query Keep [AnalysisAction]
 getAllAnalyses = do
   Keep {..} <- ask
   pure <| IxSet.toList analyses
 
-getAnalysesByAsker :: User -> Acid.Query Keep [Analysis]
+getAnalysesByAsker :: User -> Acid.Query Keep [AnalysisAction]
 getAnalysesByAsker User {..} = do
   Keep {..} <- ask
   pure <| IxSet.toList <| analyses @= userId
 
-getAnalysesByUrl :: URL -> Acid.Query Keep [Analysis]
+getAnalysesByUrl :: URL -> Acid.Query Keep [AnalysisAction]
 getAnalysesByUrl url = do
   Keep {..} <- ask
   pure <| IxSet.toList <| analyses @= url
 
-getAnalysisByUrlAndCommit :: URL -> Commit -> Acid.Query Keep (Maybe Analysis)
+getAnalysisByUrlAndCommit :: URL -> Commit -> Acid.Query Keep (Maybe AnalysisAction)
 getAnalysisByUrlAndCommit url sha = do
   Keep {..} <- ask
   pure <| IxSet.getOne <| analyses @= url &&& analyses @= sha
@@ -727,7 +683,7 @@ mock_ghUser =
 init :: Keep
 init =
   Keep
-    { nextAnalysisId = Id.mk (Proxy :: Proxy Analysis) 1,
+    { nextAnalysisId = Id.mk (Proxy :: Proxy AnalysisAction) 1,
       nextUserId = Id.mk (Proxy :: Proxy User) 1,
       users = IxSet.empty,
       analyses = IxSet.empty
@@ -817,8 +773,7 @@ test :: Test.Tree
 test =
   Test.group
     "Biz.Devalloc"
-    [ test_calculateScore,
-      test_spliceCreds,
+    [ test_spliceCreds,
       Test.with
         (startup True)
         (\t@(c, _, _) -> shutdown t >> tidy c)
@@ -851,6 +806,7 @@ data Config = Config
     -- and set in .envrc.local
     -- https://docs.github.com/en/github/authenticating-to-github/creating-a-personal-access-token
     tokn :: Text,
+    -- | The example shown on the homepage
     homeExample :: URL
   }
   deriving (Generic, Show)
@@ -950,7 +906,7 @@ data Paths path = Paths
       path
         :- Auth.Auth '[Auth.Cookie] User
         :> "analysis"
-        :> Capture "analysisId" (Id.Id Analysis)
+        :> Capture "analysisId" (Id.Id AnalysisAction)
         :> Get '[Lucid.HTML] (App.Html AnalysisDisplay),
     postAnalysis ::
       path
@@ -1256,7 +1212,7 @@ instance Lucid.ToHtml AdminDashboard where
 
 -- | The front page pitch. Eventually I'd like to load the content from markdown
 -- files or some other store of data so I can A/B test.
-data Home = Home Auth.OAuthArgs (Maybe Analysis)
+data Home = Home Auth.OAuthArgs (Maybe AnalysisAction)
 
 instance App.HasCss Home where
   cssFor (Home _ mAnalysis) = do
@@ -1356,7 +1312,7 @@ instance Lucid.ToHtml Home where
       h2 = Lucid.h2_ <. markdown
       exampleWrapper = Lucid.div_ [Lucid.class_ "example"]
 
-data Analyses = Analyses User [Analysis]
+data Analyses = Analyses User [AnalysisAction]
 
 instance App.HasCss Analyses where
   cssFor _ = mempty
@@ -1373,7 +1329,7 @@ instance Lucid.ToHtml Analyses where
             [Lucid.linkHref_ "/" <| fieldLink selectRepo]
             "Analyze one of your repos"
         Lucid.div_ <| do
-          forM_ analyses <| \Analysis {..} ->
+          forM_ analyses <| \AnalysisAction {..} ->
             Lucid.a_
               [ href analysisId,
                 css <| Biz.Look.marginAll (em 1)
@@ -1382,7 +1338,7 @@ instance Lucid.ToHtml Analyses where
               <| do
                 Lucid.div_ <| Lucid.toHtml url
                 Lucid.div_ [css <| Clay.fontSizeCustom Clay.Font.small]
-                  <| Lucid.toHtml commit
+                  <| Lucid.toHtml (commit analysis)
     footer
     where
       href aid = Lucid.linkHref_ "/" <| fieldLink getAnalysis aid
@@ -1555,7 +1511,7 @@ instance Web.FromForm SubmitAnalysis
 
 -- | I need more information than just 'Analysis' has to render a full, useful
 -- web page, hence this type.
-data AnalysisDisplay = AnalysisDisplay User Analysis
+data AnalysisDisplay = AnalysisDisplay User AnalysisAction
 
 instance App.HasCss AnalysisDisplay where
   cssFor (AnalysisDisplay _ analysis) = App.cssFor analysis
@@ -1570,164 +1526,24 @@ instance Lucid.ToHtml AnalysisDisplay where
     footer
 
 -- | Run a full analysis on a git repo
-analyze :: Acid.AcidState Keep -> Id.Id User -> [Text] -> URL -> FilePath -> Bool -> IO Analysis
+analyze :: Acid.AcidState Keep -> Id.Id User -> [Text] -> URL -> FilePath -> Bool -> IO AnalysisAction
 analyze keep askedBy activeAuthors url bareRepo repoPrivate = do
-  commit <- Sha </ Text.strip </ Text.pack </ git bareRepo ["log", "-n1", "--format=%H"]
+  commit <- Sha </ Text.strip </ Text.pack </ Analysis.git bareRepo ["log", "-n1", "--format=%H"]
   Acid.query keep (GetAnalysisByUrlAndCommit url commit) +> \case
     Just analysis -> pure analysis
     Nothing ->
-      runAnalysis bareRepo activeAuthors url askedBy repoPrivate commit
+      Analysis.run activeAuthors bareRepo
+        /> ( \a ->
+               AnalysisAction
+                 { analysisId = mempty,
+                   analysis = a,
+                   repoVisibility = repoPrivate ?: (Private, Public),
+                   ..
+                 }
+           )
         /> CreateAnalysis
         +> Acid.update keep
 
-runAnalysis :: String -> [Text] -> URL -> Id.Id User -> Bool -> Commit -> IO Analysis
-runAnalysis bareRepo activeAuthors url askedBy repoPrivate commit = do
-  tree <-
-    git
-      bareRepo
-      [ "ls-tree",
-        "--full-tree",
-        "--name-only",
-        "-r", -- recurse into subtrees
-        "HEAD"
-      ]
-      /> String.lines
-  authors <- traverse (authorsFor bareRepo) tree :: IO [[(Text, Text, Text)]]
-  let authorMap = zip tree authors :: [(FilePath, [(Text, Text, Text)])]
-  stalenessMap <- traverse (lastTouched bareRepo) tree
-  let blackholes =
-        [ Text.pack path
-          | (path, authors_) <- authorMap,
-            null (map third authors_ `List.intersect` activeAuthors)
-        ]
-  let liabilities =
-        [ Text.pack path
-          | (path, authors_) <- authorMap,
-            length (map third authors_ `List.intersect` activeAuthors) < 3
-        ]
-  let numBlackholes = realToFrac <| length blackholes
-  let numLiabilities = realToFrac <| length liabilities
-  let numTotal = realToFrac <| length tree
-  hotspotMap <-
-    Map.fromList </ Async.mapConcurrently getChangeCount tree
-  totalCommits <-
-    git bareRepo ["rev-list", "--count", "HEAD"]
-      /> filter (/= '\n')
-      /> readMaybe
-      /> fromMaybe 0
-  pure
-    <| Analysis
-      { analysisId = mempty,
-        stale =
-          [ (path, days)
-            | (path, Just days) <- stalenessMap,
-              days > 180
-          ],
-        score = calculateScore numTotal numBlackholes numLiabilities,
-        totalFiles = toInteger <| length tree,
-        repoVisibility = repoPrivate ?: (Private, Public),
-        ..
-      }
-  where
-    third :: (a, b, c) -> c
-    third (_, _, a) = a
-    getChangeCount :: FilePath -> IO (FilePath, Integer)
-    getChangeCount path =
-      git bareRepo ["rev-list", "--count", "HEAD", "--", path]
-        /> filter (/= '\n')
-        /> readMaybe
-        /> fromMaybe 0
-        /> (path,)
-
--- | Run a git command on a repo
-git ::
-  -- | path to the git dir (bare repo)
-  String ->
-  -- | args to `git`
-  [String] -> IO String
-git bareRepo args = Process.readProcess "git" (["--git-dir", bareRepo] ++ args) ""
-
--- | Does the aggregate score calculation given number of files found to be
--- blackholes, liabilities, etc.
-calculateScore :: Double -> Double -> Double -> Integer
-calculateScore 0 _ _ = 0
-calculateScore a 0 0 | a > 0 = 100
-calculateScore a b c | a < 0 || b < 0 || c < 0 = 0
-calculateScore numTotal numBlackholes numLiabilities =
-  max 0 <. round
-    <| maxScore
-    * (weightedBlackholes + weightedLiabilities + numGood)
-    / numTotal
-  where
-    weightedBlackholes = numBlackholes * (5 / 10)
-    weightedLiabilities = numLiabilities * (7 / 10)
-    numGood = numTotal - numBlackholes - numLiabilities
-    maxScore = 100.0
-
-test_calculateScore :: Test.Tree
-test_calculateScore =
-  Test.group
-    "calculateScore"
-    [ Test.unit "perfect score" <| 100 @=? calculateScore 100 0 0,
-      Test.unit "all blackholes" <| 50 @=? calculateScore 100 100 0,
-      Test.unit "all liabilities" <| 70 @=? calculateScore 100 0 100,
-      Test.prop "never > 100" <| \t b l -> calculateScore t b l <= 100,
-      Test.prop "never < 0" <| \t b l -> calculateScore t b l >= 0
-    ]
-
-lastTouched :: FilePath -> FilePath -> IO (FilePath, Maybe Integer)
-lastTouched bareRepo path = do
-  now <- Time.getCurrentTime
-  timestamp <-
-    Process.readProcess
-      "git"
-      [ "--git-dir",
-        bareRepo,
-        "log",
-        "-n1",
-        "--pretty=%aI",
-        "--",
-        path
-      ]
-      ""
-      /> filter (/= '\n')
-      /> Time.parseTimeM True Time.defaultTimeLocale "%Y-%m-%dT%H:%M:%S%z"
-  pure (path, calculateAge now </ timestamp)
-  where
-    calculateAge now n = round <| Time.diffUTCTime now n / Time.nominalDay
-
--- | Given a git dir and a path inside the git repo, get information about the
--- authors.
-authorsFor ::
-  FilePath ->
-  FilePath ->
-  -- | returns (number of commits, author name, author email)
-  IO [(Text, Text, Text)]
-authorsFor gitDir path =
-  Process.readProcess
-    "git"
-    [ "--git-dir",
-      gitDir,
-      "shortlog",
-      "--numbered",
-      "--summary",
-      "--email",
-      "HEAD",
-      "--",
-      path
-    ]
-    ""
-    /> Text.pack
-    /> Text.lines
-    /> map (Text.break (== '\t'))
-    /> map parseAuthor
-  where
-    parseAuthor (commits, author) =
-      ( Text.strip commits,
-        Text.strip <| Text.takeWhile (/= '<') author,
-        Text.strip <| Text.dropAround (`elem` ['<', '>']) <| Text.dropWhile (/= '<') author
-      )
-
 spliceCreds :: User -> Text -> Text
 spliceCreds User {..} url =
   scheme <> "//" <> unGitHubHandle userGitHubHandle <> ":" <> userGitHubToken <> "@" <> Text.drop 2 rest
@@ -1767,7 +1583,7 @@ analyzeGitHub ::
   Text ->
   -- | GitHub repo
   Text ->
-  IO Analysis
+  IO AnalysisAction
 analyzeGitHub keep user@User {userId} ghAuth depo o r = do
   activeAuthors <-
     getPeople
@@ -1823,7 +1639,7 @@ test_analyzeGitHub load =
     [ Test.unit "can analyze a public repo (octocat/hello-world)" <| do
         (c, _, k) <- load
         let user@User {userGitHubToken} = mock_user c
-        Analysis {..} <-
+        AnalysisAction {..} <-
           analyzeGitHub
             k
             user
@@ -1832,19 +1648,20 @@ test_analyzeGitHub load =
             "octocat"
             "hello-world"
         url @?= URL "https://github.com/octocat/Hello-World"
-        bareRepo @?= depo c <> "/github.com/octocat/Hello-World.git"
+        -- bareRepo @?= depo c <> "/github.com/octocat/Hello-World.git"
+        let Analysis {..} = analysis
         length activeAuthors @?= 2
         activeAuthors @?= ["hire@spacegho.st", "octocat@github.com"]
         blackholes @?= ["README"]
         liabilities @?= ["README"]
-        fst </ headMay stale @?= Just "README"
+        Map.member "README" stale @?= True
         score @?= 20
         totalFiles @?= 1
         commit @?= Sha "7fd1a60b01f91b314f59955a4e4d4e80d8edf11d",
       Test.unit "can analyze a private repo (bsima/biz)" <| do
         (c, _, k) <- load
         let user@User {userGitHubToken} = mock_user c
-        Analysis {..} <-
+        AnalysisAction {..} <-
           analyzeGitHub
             k
             user
@@ -1853,7 +1670,7 @@ test_analyzeGitHub load =
             "bsima"
             "biz"
         url @?= URL "https://github.com/bsima/biz"
-        bareRepo @?= depo c <> "/github.com/bsima/biz.git"
+        -- bareRepo @?= depo c <> "/github.com/bsima/biz.git"
     ]
   where
     mock_user c =
diff --git a/Biz/Devalloc/Analysis.hs b/Biz/Devalloc/Analysis.hs
new file mode 100644
index 0000000..4b1f297
--- /dev/null
+++ b/Biz/Devalloc/Analysis.hs
@@ -0,0 +1,252 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE TupleSections #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+
+-- : out devalloc-analyze
+module Biz.Devalloc.Analysis
+  ( Analysis (..),
+    Commit (..),
+    run,
+    main,
+    test,
+    git,
+  )
+where
+
+import Alpha
+import qualified Biz.Cli as Cli
+import Biz.Test ((@=?))
+import qualified Biz.Test as Test
+import qualified Control.Concurrent.Async as Async
+import qualified Data.Aeson as Aeson
+import Data.Data (Data)
+import qualified Data.List as List
+import qualified Data.Map as Map
+import qualified Data.String as String
+import qualified Data.Text as Text
+import qualified Data.Time.Clock as Time
+import qualified Data.Time.Format as Time
+import qualified System.Directory as Directory
+import qualified System.Process as Process
+
+main :: IO ()
+main = Cli.main <| Cli.Plan help move test tidy
+
+move :: Cli.Arguments -> IO ()
+move args = gitDir +> run authors /> Aeson.encode +> putStrLn
+  where
+    gitDir =
+      Cli.argument "git-dir"
+        |> Cli.getArgWithDefault args ".git"
+        |> Directory.makeAbsolute
+    authors =
+      -- i think this is not working? do i need optparse-applicative?
+      Cli.shortOption 'a'
+        |> Cli.getAllArgs args
+        |> map Text.pack
+
+tidy :: cfg -> IO ()
+tidy _ = pure ()
+
+test :: Test.Tree
+test = Test.group "Biz.Devalloc.Analysis" [test_calculateScore]
+
+help :: Cli.Docopt
+help =
+  [Cli.docopt|
+devalloc-analyze
+
+Usage:
+  devalloc-analyze test
+  devalloc-analyze [--author=<email>]... <git-dir>
+
+Options:
+  -a, --author  List of active authors' emails.
+|]
+
+newtype Commit = Sha Text
+  deriving (Eq, Data, Typeable, Ord, Generic, Show)
+
+instance Aeson.ToJSON Commit
+
+-- | The result of analyzing a git repo.
+data Analysis = Analysis
+  { -- | Where the repo is stored on the local disk.
+    gitDir :: FilePath,
+    -- | A path with no active contributors
+    blackholes :: [Text],
+    -- | A path with < 3 active contributors
+    liabilities :: [Text],
+    -- | Map of path to number of commits, for detecting paths that continually
+    -- get rewritten.
+    hotspotMap :: Map FilePath Integer,
+    -- | Files that have not been touched in 6 months
+    stale :: Map FilePath Integer,
+    -- | Total score for the repo
+    score :: Integer,
+    -- | Total number of files
+    totalFiles :: Integer,
+    -- | The total number of commits
+    totalCommits :: Integer,
+    -- | List of all the active users we care about
+    activeAuthors :: [Text],
+    -- | Which commit this analysis was run against.
+    commit :: Commit
+  }
+  deriving (Eq, Ord, Generic, Show, Data, Typeable)
+
+instance Aeson.ToJSON Analysis
+
+run :: [Text] -> FilePath -> IO Analysis
+run activeAuthors bareRepo = do
+  commit <- git bareRepo ["rev-parse", "HEAD"] /> Text.pack /> chomp /> Sha
+  tree <-
+    git
+      bareRepo
+      [ "ls-tree",
+        "--full-tree",
+        "--name-only",
+        "-r", -- recurse into subtrees
+        "HEAD"
+      ]
+      /> String.lines
+  authors <- traverse (authorsFor bareRepo) tree :: IO [[(Text, Text, Text)]]
+  let authorMap = zip tree authors :: [(FilePath, [(Text, Text, Text)])]
+  stalenessMap <- traverse (lastTouched bareRepo) tree
+  let blackholes =
+        [ Text.pack path
+          | (path, authors_) <- authorMap,
+            null (map third authors_ `List.intersect` activeAuthors)
+        ]
+  let liabilities =
+        [ Text.pack path
+          | (path, authors_) <- authorMap,
+            length (map third authors_ `List.intersect` activeAuthors) < 3
+        ]
+  let numBlackholes = realToFrac <| length blackholes
+  let numLiabilities = realToFrac <| length liabilities
+  let numTotal = realToFrac <| length tree
+  hotspotMap <-
+    Map.fromList </ Async.mapConcurrently getChangeCount tree
+  totalCommits <-
+    git bareRepo ["rev-list", "--count", "HEAD"]
+      /> filter (/= '\n')
+      /> readMaybe
+      /> fromMaybe 0
+  pure
+    <| Analysis
+      { gitDir = bareRepo,
+        stale =
+          Map.fromList
+            <| [ (path, days)
+                 | (path, Just days) <- stalenessMap,
+                   days > 180
+               ],
+        score = calculateScore numTotal numBlackholes numLiabilities,
+        totalFiles = toInteger <| length tree,
+        ..
+      }
+  where
+    third :: (a, b, c) -> c
+    third (_, _, a) = a
+    getChangeCount :: FilePath -> IO (FilePath, Integer)
+    getChangeCount path =
+      git bareRepo ["rev-list", "--count", "HEAD", "--", path]
+        /> filter (/= '\n')
+        /> readMaybe
+        /> fromMaybe 0
+        /> (path,)
+
+-- | Given a git dir and a path inside the git repo, get information about the
+-- authors.
+authorsFor ::
+  FilePath ->
+  FilePath ->
+  -- | returns (number of commits, author name, author email)
+  IO [(Text, Text, Text)]
+authorsFor gitDir path =
+  Process.readProcess
+    "git"
+    [ "--git-dir",
+      gitDir,
+      "shortlog",
+      "--numbered",
+      "--summary",
+      "--email",
+      "HEAD",
+      "--",
+      path
+    ]
+    ""
+    /> Text.pack
+    /> Text.lines
+    /> map (Text.break (== '\t'))
+    /> map parseAuthor
+  where
+    parseAuthor (commits, author) =
+      ( Text.strip commits,
+        Text.strip <| Text.takeWhile (/= '<') author,
+        Text.strip <| Text.dropAround (`elem` ['<', '>']) <| Text.dropWhile (/= '<') author
+      )
+
+-- | Run a git command on a repo
+git ::
+  -- | path to the git dir (bare repo)
+  String ->
+  -- | args to `git`
+  [String] ->
+  IO String
+git bareRepo args = Process.readProcess "git" (["--git-dir", bareRepo] ++ args) ""
+
+lastTouched :: FilePath -> FilePath -> IO (FilePath, Maybe Integer)
+lastTouched bareRepo path = do
+  now <- Time.getCurrentTime
+  timestamp <-
+    Process.readProcess
+      "git"
+      [ "--git-dir",
+        bareRepo,
+        "log",
+        "-n1",
+        "--pretty=%aI",
+        "--",
+        path
+      ]
+      ""
+      /> filter (/= '\n')
+      /> Time.parseTimeM True Time.defaultTimeLocale "%Y-%m-%dT%H:%M:%S%z"
+  pure (path, calculateAge now </ timestamp)
+  where
+    calculateAge now n = round <| Time.diffUTCTime now n / Time.nominalDay
+
+-- | Does the aggregate score calculation given number of files found to be
+-- blackholes, liabilities, etc.
+calculateScore :: Double -> Double -> Double -> Integer
+calculateScore 0 _ _ = 0
+calculateScore a 0 0 | a > 0 = 100
+calculateScore a b c | a < 0 || b < 0 || c < 0 = 0
+calculateScore numTotal numBlackholes numLiabilities =
+  max 0 <. round
+    <| maxScore
+    * (weightedBlackholes + weightedLiabilities + numGood)
+    / numTotal
+  where
+    weightedBlackholes = numBlackholes * (5 / 10)
+    weightedLiabilities = numLiabilities * (7 / 10)
+    numGood = numTotal - numBlackholes - numLiabilities
+    maxScore = 100.0
+
+test_calculateScore :: Test.Tree
+test_calculateScore =
+  Test.group
+    "calculateScore"
+    [ Test.unit "perfect score" <| 100 @=? calculateScore 100 0 0,
+      Test.unit "all blackholes" <| 50 @=? calculateScore 100 100 0,
+      Test.unit "all liabilities" <| 70 @=? calculateScore 100 0 100,
+      Test.prop "never > 100" <| \t b l -> calculateScore t b l <= 100,
+      Test.prop "never < 0" <| \t b l -> calculateScore t b l >= 0
+    ]