shelltest: make fields in .test files optional

tests/missing-real-and-virtual-amt.test

@@ -5,7 +5,6 @@ register
     assets:cash
     [expenses:car]                                      $3.50
     [simon]
->>>
 >>>2
 "-" (line 6, column 1):
 unexpected end of input
@@ -17,4 +16,3 @@ could not balance this transaction, amounts do not add up to zero:
     [simon]                                         
 
 
-===0

tests/sample-balance-depth.test

@@ -1,9 +1,6 @@
 -f sample.ledger balance --depth 1
-<<<
 >>>
                  $-1  assets
                   $2  expenses
                  $-2  income
                   $1  liabilities
->>>2
-===0

tests/sample-balance-o.test

@@ -1,11 +1,8 @@
 -f sample.ledger balance o
-<<<
->>>1
+>>>
                   $1  expenses:food
                  $-2  income
                  $-1    gifts
                  $-1    salary
 --------------------
                  $-1
->>>2
-===0

tests/sample-balance.test

@@ -1,6 +1,5 @@
 -f sample.ledger balance
-<<<
->>>1
+>>>
                  $-1  assets
                   $1    bank:saving
                  $-2    cash
@@ -11,5 +10,3 @@
                  $-1    gifts
                  $-1    salary
                   $1  liabilities:debts
->>>2
-===0

tests/unbalanced.test

@@ -4,7 +4,6 @@ register
 2009/1/1 a
   b  1.1
   c  -1
->>>
 >>>2
 "-" (line 4, column 1):
 unexpected end of input

tools/shelltest.hs

@@ -24,13 +24,15 @@ error output
 ;
 ; Lines whose first non-whitespace character is ; are ignored.
 ; The first line is the command line. "hledger" is prepended, and "-f-" is
-; appended unless there is a -f or <... argument (in which case the
+; appended unless there is a -f or <... argument (in which case any
 ; provided input is ignored.)
 ; Then there is a line containing <<< and 0 or more lines of input.
 ; Then a line containing >>> (or >>>1 for ledger testrunner compatibility)
 ; and 0 or more lines of expected output.
 ; Then a line containing >>>2 and 0 or more lines of expected stderr output.
 ; Then === and the expected exit code (on the same line).
+; All fields except for the command line are optional, when omitted they
+; are assumed to be "", "", "", and 0 respectively.
 @
 -}
 
@@ -42,16 +44,21 @@ import System.Process (runInteractiveCommand, waitForProcess)
 import Text.Printf (printf)
 import Text.ParserCombinators.Parsec
 import Control.Monad (liftM,when)
+import Data.Maybe (fromMaybe)
+import Debug.Trace
+strace :: Show a => a -> a
+strace a = trace (show a) a
+
 
 exe :: String
 exe = "hledger"
 
 data ShellTest = ShellTest {
      command          :: String
-    ,stdin            :: String
-    ,stdoutExpected   :: String
-    ,stderrExpected   :: String
-    ,exitCodeExpected :: ExitCode
+    ,stdin            :: Maybe String
+    ,stdoutExpected   :: Maybe String
+    ,stderrExpected   :: Maybe String
+    ,exitCodeExpected :: Maybe ExitCode
     } deriving (Show)
 
 main :: IO ()
@@ -65,43 +72,47 @@ parseShellTest = liftM (either (error.show) id) . parseFromFile shelltest
 
 shelltest :: Parser ShellTest
 shelltest = do
-  c <- line; string "<<<\n"
-  i <- line `manyTill` (string ">>>" >> optional (char '1') >> char '\n')
-  o <- line `manyTill` (string ">>>2\n")
-  e <- line `manyTill` (string "===")
-  x <- line
-  let x' = read x -- `catch` (\e -> fail (show e))
-  eof
-  return ShellTest{command=c,stdin=unlines i,stdoutExpected=unlines o,stderrExpected=unlines e,exitCodeExpected=toExitCode x'}
+  c <- commandline
+  i <- optionMaybe input
+  o <- optionMaybe expectedoutput
+  e <- optionMaybe expectederror
+  x <- optionMaybe expectedexitcode
+  return ShellTest{command=c,stdin=i,stdoutExpected=o,stderrExpected=e,exitCodeExpected=x}
 
-line :: Parser String
-line = do
+commandline,input,expectedoutput,expectederror,delimiter,line :: Parser String
+commandline = line
+input = string "<<<\n" >> (liftM unlines) (line `manyTill` (lookAhead delimiter))
+expectedoutput = try $ string ">>>" >> optional (char '1') >> char '\n' >> (liftM unlines) (line `manyTill` (lookAhead delimiter))
+expectederror = string ">>>2" >> (liftM $ unlines.tail) (line `manyTill` (lookAhead delimiter)) -- why tail ?
+delimiter = choice [try $ string "<<<", try $ string ">>>", try $ string "===", (eof >> return "")]
+line =  do
   l <- anyChar `manyTill` newline
-  if take 1 (strip l) == ";"
-   then line
-   else return l
+  if take 1 (strip l) == ";" then line else return l
+expectedexitcode :: Parser ExitCode
+expectedexitcode = string "===" >> liftM (toExitCode.read) line -- `catch` (\e -> fail (show e))
 
 runShellTest :: ShellTest -> IO Bool
 runShellTest ShellTest{
     command=c,stdin=i,stdoutExpected=o,stderrExpected=e,exitCodeExpected=x} = do
   let cmd = unwords [exe,c,if (any isinputarg $ words c) then "" else "-f-"]
             where isinputarg a = take 2 a == "-f" || (take 1 a == "<")
+      (i',o',e',x') = (fromMaybe "" i, fromMaybe "" o, fromMaybe "" e, fromMaybe ExitSuccess x)
   printf "Testing: %s" cmd; hFlush stdout
   (ih,oh,eh,ph) <- runInteractiveCommand cmd
-  hPutStr ih i
+  hPutStr ih i'
   out <- hGetContents oh
   err <- hGetContents eh
   exit <- waitForProcess ph
-  let (outputok, errorok, exitok) = (out==o, err==e, exit==x)
+  let (outputok, errorok, exitok) = (out==o', err==e', exit==x')
   if outputok && errorok && exitok 
    then do
      putStrLn " .. ok"
      return True 
    else do
      hPutStr stderr $ printf " .. FAIL\n"
-     when (not outputok) $ printExpectedActual "stdout" o out
-     when (not errorok)  $ printExpectedActual "stderr" e err
-     when (not exitok)   $ printExpectedActual "exit code" (show (fromExitCode x)++"\n") (show (fromExitCode exit)++"\n")
+     when (not outputok) $ printExpectedActual "stdout" o' out
+     when (not errorok)  $ printExpectedActual "stderr" e' err
+     when (not exitok)   $ printExpectedActual "exit code" (show (fromExitCode x')++"\n") (show (fromExitCode exit)++"\n")
      return False
 
 printExpectedActual :: String -> String -> String -> IO ()