451 lines
17 KiB
Haskell
451 lines
17 KiB
Haskell
{-# LANGUAGE TemplateHaskell, QuasiQuotes, OverloadedStrings #-}
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{-
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hledger-web's request handlers, and helpers.
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-}
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module Handlers where
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import Control.Applicative ((<$>), (<*>))
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import Data.Aeson
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import Data.ByteString (ByteString)
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import Data.Either (lefts,rights)
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import Data.List
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import Data.Maybe
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import Data.Text(Text,pack,unpack)
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import Data.Time.Calendar
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import Safe
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import System.FilePath (takeFileName, (</>))
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import System.IO.Storage (putValue, getValue)
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import Text.Hamlet hiding (hamletFile)
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import Text.Printf
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import Text.RegexPR
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import Yesod.Form
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import Yesod.Json
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import Hledger.Cli
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import Hledger.Cli.Version -- XXX
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import Hledger.Data hiding (today)
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import Hledger.Read (journalFromPathAndString)
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import Hledger.Read.JournalReader (someamount)
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import Hledger.Utils
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import App
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import Settings
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getFaviconR :: Handler ()
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getFaviconR = sendFile "image/x-icon" $ Settings.staticdir </> "favicon.ico"
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getRobotsR :: Handler RepPlain
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getRobotsR = return $ RepPlain $ toContent ("User-agent: *" :: ByteString)
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getRootR :: Handler RepHtml
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getRootR = redirect RedirectTemporary defaultroute where defaultroute = RegisterR
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----------------------------------------------------------------------
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-- main views
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-- | The main journal view, with accounts sidebar.
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getJournalR :: Handler RepHtml
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getJournalR = do
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vd@VD{opts=opts,m=m,j=j} <- getViewData
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let sidecontent = balanceReportAsHtml opts vd{q=""} $ balanceReport opts nullfilterspec j
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maincontent = journalReportAsHtml opts vd $ journalReport opts nullfilterspec $ filterJournalTransactions2 m j
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defaultLayout $ do
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setTitle "hledger-web journal"
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addHamlet $(Settings.hamletFile "journal")
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postJournalR :: Handler RepPlain
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postJournalR = handlePost
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-- | The main register view, with accounts sidebar.
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getRegisterR :: Handler RepHtml
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getRegisterR = do
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vd@VD{opts=opts,m=m,j=j} <- getViewData
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let sidecontent = balanceReportAsHtml opts vd{q=""} $ balanceReport opts nullfilterspec j
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maincontent = registerReportAsHtml opts vd $ registerReport opts nullfilterspec $ filterJournalPostings2 m j
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editform' = editform vd
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defaultLayout $ do
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setTitle "hledger-web register"
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addHamlet $(Settings.hamletFile "register")
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postRegisterR :: Handler RepPlain
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postRegisterR = handlePost
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-- | A simple journal view, like hledger print (with editing.)
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getJournalOnlyR :: Handler RepHtml
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getJournalOnlyR = do
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vd@VD{opts=opts,m=m,j=j} <- getViewData
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defaultLayout $ do
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setTitle "hledger-web journal only"
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addHamlet $ journalReportAsHtml opts vd $ journalReport opts nullfilterspec $ filterJournalTransactions2 m j
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postJournalOnlyR :: Handler RepPlain
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postJournalOnlyR = handlePost
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-- | A simple postings view, like hledger register (with editing.)
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getRegisterOnlyR :: Handler RepHtml
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getRegisterOnlyR = do
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vd@VD{opts=opts,m=m,j=j} <- getViewData
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defaultLayout $ do
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setTitle "hledger-web register only"
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addHamlet $ registerReportAsHtml opts vd $ registerReport opts nullfilterspec $ filterJournalPostings2 m j
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postRegisterOnlyR :: Handler RepPlain
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postRegisterOnlyR = handlePost
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-- | A simple accounts view, like hledger balance. If the Accept header
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-- specifies json, returns the chart of accounts as json.
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getAccountsR :: Handler RepHtmlJson
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getAccountsR = do
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vd@VD{opts=opts,m=m,j=j} <- getViewData
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let j' = filterJournalPostings2 m j
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html = do
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setTitle "hledger-web accounts"
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addHamlet $ balanceReportAsHtml opts vd $ balanceReport opts nullfilterspec j'
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json = jsonMap [("accounts", toJSON $ journalAccountNames j')]
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defaultLayoutJson html json
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-- | Return the chart of accounts as json, without needing a special Accept header.
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getAccountsJsonR :: Handler RepJson
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getAccountsJsonR = do
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VD{m=m,j=j} <- getViewData
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let j' = filterJournalPostings2 m j
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jsonToRepJson $ jsonMap [("accounts", toJSON $ journalAccountNames j')]
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-- helpers
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accountUrl :: String -> String
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accountUrl a = "in:" ++ quoteIfSpaced (accountNameToAccountRegex a)
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-- | Render a balance report as HTML.
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balanceReportAsHtml :: [Opt] -> ViewData -> BalanceReport -> Hamlet AppRoute
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balanceReportAsHtml _ vd@VD{here=here,q=q,m=m,j=j} (items,total) = $(Settings.hamletFile "balancereport")
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where
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filtering = not $ null q
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inacct = headMay $ filter (m `matchesInAccount`) $ journalAccountNames j
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itemAsHtml :: ViewData -> BalanceReportItem -> Hamlet AppRoute
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itemAsHtml VD{here=here,q=q} (acct, adisplay, aindent, abal) = $(Settings.hamletFile "balancereportitem")
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where
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depthclass = "depth"++show aindent
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inclass = if acct == inacct then "inacct" else "notinacct" :: String
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indent = preEscapedString $ concat $ replicate (2 * aindent) " "
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accturl = (here, [("q", pack $ accountUrl acct)])
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-- | Render a journal report as HTML.
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journalReportAsHtml :: [Opt] -> ViewData -> JournalReport -> Hamlet AppRoute
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journalReportAsHtml _ vd items = $(Settings.hamletFile "journalreport")
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where
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itemAsHtml :: ViewData -> (Int, JournalReportItem) -> Hamlet AppRoute
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itemAsHtml _ (n, t) = $(Settings.hamletFile "journalreportitem")
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where
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evenodd = if even n then "even" else "odd" :: String
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txn = trimnl $ showTransaction t where trimnl = reverse . dropWhile (=='\n') . reverse
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-- | Render a register report as HTML.
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registerReportAsHtml :: [Opt] -> ViewData -> RegisterReport -> Hamlet AppRoute
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registerReportAsHtml _ vd items = $(Settings.hamletFile "registerreport")
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where
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itemAsHtml :: ViewData -> (Int, RegisterReportItem) -> Hamlet AppRoute
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itemAsHtml VD{here=here} (n, (ds, posting, b)) = $(Settings.hamletFile "registerreportitem")
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where
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evenodd = if even n then "even" else "odd" :: String
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(firstposting, date, desc) = case ds of Just (da, de) -> ("firstposting", show da, de)
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Nothing -> ("", "", "") :: (String,String,String)
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acct = paccount posting
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accturl = (here, [("q", pack $ accountUrl acct)])
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mixedAmountAsHtml b = preEscapedString $ addclass $ intercalate "<br>" $ lines $ show b
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where addclass = printf "<span class=\"%s\">%s</span>" (c :: String)
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c = case isNegativeMixedAmount b of Just True -> "negative amount"
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_ -> "positive amount"
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-- | Handle a post from any of the edit forms.
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handlePost :: Handler RepPlain
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handlePost = do
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action <- runFormPost' $ maybeStringInput "action"
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case action of Just "add" -> handleAdd
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Just "edit" -> handleEdit
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Just "import" -> handleImport
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_ -> invalidArgs [pack "invalid action"]
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-- | Handle a post from the transaction add form.
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handleAdd :: Handler RepPlain
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handleAdd = do
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VD{j=j,today=today} <- getViewData
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-- get form input values. M means a Maybe value.
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(dateM, descM, acct1M, amt1M, acct2M, amt2M, journalM) <- runFormPost'
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$ (,,,,,,)
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<$> maybeStringInput "date"
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<*> maybeStringInput "description"
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<*> maybeStringInput "account1"
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<*> maybeStringInput "amount1"
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<*> maybeStringInput "account2"
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<*> maybeStringInput "amount2"
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<*> maybeStringInput "journal"
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-- supply defaults and parse date and amounts, or get errors.
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let dateE = maybe (Left "date required") (either (\e -> Left $ showDateParseError e) Right . fixSmartDateStrEither today . unpack) dateM
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descE = Right $ maybe "" unpack descM
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acct1E = maybe (Left "to account required") (Right . unpack) acct1M
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acct2E = maybe (Left "from account required") (Right . unpack) acct2M
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amt1E = maybe (Left "amount required") (either (const $ Left "could not parse amount") Right . parseWithCtx nullctx someamount . unpack) amt1M
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amt2E = maybe (Right missingamt) (either (const $ Left "could not parse amount") Right . parseWithCtx nullctx someamount . unpack) amt2M
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journalE = maybe (Right $ journalFilePath j)
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(\f -> let f' = unpack f in
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if f' `elem` journalFilePaths j
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then Right f'
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else Left $ "unrecognised journal file path: " ++ f'
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)
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journalM
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strEs = [dateE, descE, acct1E, acct2E, journalE]
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amtEs = [amt1E, amt2E]
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errs = lefts strEs ++ lefts amtEs
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[date,desc,acct1,acct2,journalpath] = rights strEs
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[amt1,amt2] = rights amtEs
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-- if no errors so far, generate a transaction and balance it or get the error.
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tE | not $ null errs = Left errs
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| otherwise = either (\e -> Left ["unbalanced postings: " ++ (head $ lines e)]) Right
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(balanceTransaction Nothing $ nulltransaction { -- imprecise balancing
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tdate=parsedate date
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,tdescription=desc
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,tpostings=[
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Posting False acct1 amt1 "" RegularPosting [] Nothing
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,Posting False acct2 amt2 "" RegularPosting [] Nothing
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]
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})
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-- display errors or add transaction
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case tE of
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Left errs -> do
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-- save current form values in session
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setMessage $ toHtml $ intercalate "; " errs
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redirect RedirectTemporary RegisterR
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Right t -> do
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let t' = txnTieKnot t -- XXX move into balanceTransaction
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liftIO $ appendToJournalFile journalpath $ showTransaction t'
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setMessage $ toHtml $ (printf "Added transaction:\n%s" (show t') :: String)
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redirect RedirectTemporary RegisterR
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-- | Handle a post from the journal edit form.
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handleEdit :: Handler RepPlain
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handleEdit = do
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VD{j=j} <- getViewData
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-- get form input values, or validation errors.
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-- getRequest >>= liftIO (reqRequestBody req) >>= mtrace
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(textM, journalM) <- runFormPost'
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$ (,)
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<$> maybeStringInput "text"
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<*> maybeStringInput "journal"
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let textE = maybe (Left "No value provided") (Right . unpack) textM
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journalE = maybe (Right $ journalFilePath j)
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(\f -> let f' = unpack f in
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if f' `elem` journalFilePaths j
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then Right f'
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else Left "unrecognised journal file path")
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journalM
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strEs = [textE, journalE]
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errs = lefts strEs
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[text,journalpath] = rights strEs
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-- display errors or perform edit
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if not $ null errs
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then do
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setMessage $ toHtml (intercalate "; " errs :: String)
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redirect RedirectTemporary JournalR
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else do
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-- try to avoid unnecessary backups or saving invalid data
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filechanged' <- liftIO $ journalSpecifiedFileIsNewer j journalpath
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told <- liftIO $ readFileStrictly journalpath
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let tnew = filter (/= '\r') text
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changed = tnew /= told || filechanged'
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if not changed
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then do
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setMessage "No change"
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redirect RedirectTemporary JournalR
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else do
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jE <- liftIO $ journalFromPathAndString Nothing journalpath tnew
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either
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(\e -> do
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setMessage $ toHtml e
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redirect RedirectTemporary JournalR)
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(const $ do
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liftIO $ writeFileWithBackup journalpath tnew
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setMessage $ toHtml (printf "Saved journal %s\n" (show journalpath) :: String)
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redirect RedirectTemporary JournalR)
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jE
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-- | Handle post from the journal import form.
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handleImport :: Handler RepPlain
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handleImport = do
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setMessage "can't handle file upload yet"
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redirect RedirectTemporary JournalR
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-- -- get form input values, or basic validation errors. E means an Either value.
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-- fileM <- runFormPost' $ maybeFileInput "file"
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-- let fileE = maybe (Left "No file provided") Right fileM
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-- -- display errors or import transactions
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-- case fileE of
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-- Left errs -> do
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-- setMessage errs
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-- redirect RedirectTemporary JournalR
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-- Right s -> do
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-- setMessage s
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-- redirect RedirectTemporary JournalR
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----------------------------------------------------------------------
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-- | Other view components.
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-- | Global toolbar/heading area.
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topbar :: ViewData -> Hamlet AppRoute
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topbar VD{j=j,msg=msg,today=today} = $(Settings.hamletFile "topbar")
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where
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title = takeFileName $ journalFilePath j
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-- | Links to navigate between the main views.
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navlinks :: ViewData -> Hamlet AppRoute
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navlinks vd = $(Settings.hamletFile "navlinks")
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where
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accountsjournallink = navlink vd "transactions" JournalR
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accountsregisterlink = navlink vd "postings" RegisterR
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navlink :: ViewData -> String -> AppRoute -> Hamlet AppRoute
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navlink VD{here=here,q=q} s dest = $(Settings.hamletFile "navlink")
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where u = (dest, if null q then [] else [("q", pack q)])
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style | dest == here = "navlinkcurrent"
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| otherwise = "navlink" :: Text
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-- | Links to the various journal editing forms.
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editlinks :: Hamlet AppRoute
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editlinks = $(Settings.hamletFile "editlinks")
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-- | Link to a topic in the manual.
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helplink :: String -> String -> Hamlet AppRoute
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helplink topic label = $(Settings.hamletFile "helplink")
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where u = manualurl ++ if null topic then "" else '#':topic
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-- | Form controlling journal filtering parameters.
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filterform :: ViewData -> Hamlet AppRoute
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filterform VD{here=here,q=q} = $(Settings.hamletFile "filterform")
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where
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filtering = not $ null q
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-- | Add transaction form.
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addform :: ViewData -> Hamlet AppRoute
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addform vd = $(Settings.hamletFile "addform")
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where
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datehelp = "eg: 2010/7/20" :: String
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deschelp = "eg: supermarket (optional)" :: String
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date = "today" :: String
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descriptions = sort $ nub $ map tdescription $ jtxns $ j vd
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manyfiles = (length $ files $ j vd) > 1
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postingfields VD{j=j} n = $(Settings.hamletFile "addformpostingfields")
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where
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numbered = (++ show n)
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acctvar = numbered "account"
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amtvar = numbered "amount"
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acctnames = sort $ journalAccountNamesUsed j
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(acctlabel, accthelp, amtfield, amthelp)
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| n == 1 = ("To account"
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,"eg: expenses:food"
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,$(Settings.hamletFile "addformpostingfieldsamount")
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,"eg: $6"
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)
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| otherwise = ("From account" :: String
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,"eg: assets:bank:checking" :: String
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,nulltemplate
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,"" :: String
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)
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-- | Edit journal form.
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editform :: ViewData -> Hamlet AppRoute
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editform VD{j=j} = $(Settings.hamletFile "editform")
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where
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manyfiles = (length $ files j) > 1
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formathelp = helplink "file-format" "file format help"
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-- | Import journal form.
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importform :: Hamlet AppRoute
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importform = $(Settings.hamletFile "importform")
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journalselect :: [(FilePath,String)] -> Hamlet AppRoute
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journalselect journalfiles = $(Settings.hamletFile "journalselect")
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----------------------------------------------------------------------
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-- utilities
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nulltemplate :: Hamlet AppRoute
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nulltemplate = [$hamlet||]
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-- | A bundle of data useful for handlers and their templates.
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data ViewData = VD {
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opts :: [Opt] -- ^ command-line options at startup
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,q :: String -- ^ current q (query) parameter
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,m :: Matcher -- ^ a search/filter expression based on the above
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,j :: Journal -- ^ the up-to-date parsed unfiltered journal
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,today :: Day -- ^ the current day
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,here :: AppRoute -- ^ the current route
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,msg :: Maybe Html -- ^ the current UI message if any, possibly from the current request
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}
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mkvd :: ViewData
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mkvd = VD {
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opts = []
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,q = ""
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,m = MatchAny
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,j = nulljournal
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,today = ModifiedJulianDay 0
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,here = RootR
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,msg = Nothing
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}
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-- | Gather data useful for a hledger-web request handler and its templates.
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getViewData :: Handler ViewData
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getViewData = do
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app <- getYesod
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let opts = appOpts app
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(j, err) <- getCurrentJournal opts
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msg <- getMessageOr err
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Just here' <- getCurrentRoute
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today <- liftIO getCurrentDay
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q <- getParameter "q"
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let m = strace $ parseMatcher today q
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return mkvd{opts=opts, q=q, m=m, j=j, today=today, here=here', msg=msg}
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where
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-- | Update our copy of the journal if the file changed. If there is an
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-- error while reloading, keep the old one and return the error, and set a
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-- ui message.
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getCurrentJournal :: [Opt] -> Handler (Journal, Maybe String)
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getCurrentJournal opts = do
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j <- liftIO $ fromJust `fmap` getValue "hledger" "journal"
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(jE, changed) <- liftIO $ journalReloadIfChanged opts j
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if not changed
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then return (j,Nothing)
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else case jE of
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Right j' -> do liftIO $ putValue "hledger" "journal" j'
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return (j',Nothing)
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Left e -> do setMessage $ "error while reading" {- ++ ": " ++ e-}
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return (j, Just e)
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-- | Get the named request parameter.
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getParameter :: String -> Handler String
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getParameter p = unpack `fmap` fromMaybe "" <$> lookupGetParam (pack p)
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-- | Get the message set by the last request, or the newer message provided, if any.
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getMessageOr :: Maybe String -> Handler (Maybe Html)
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getMessageOr mnewmsg = do
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oldmsg <- getMessage
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return $ maybe oldmsg (Just . toHtml) mnewmsg
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accountNameToAccountRegex :: String -> String
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accountNameToAccountRegex "" = ""
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accountNameToAccountRegex a = printf "^%s(:|$)" a
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accountRegexToAccountName :: String -> String
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accountRegexToAccountName = gsubRegexPR "^\\^(.*?)\\(:\\|\\$\\)$" "\\1"
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isAccountRegex :: String -> Bool
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isAccountRegex s = take 1 s == "^" && (take 5 $ reverse s) == ")$|:("
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numbered = zip [1..]
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