imp:print:beancount: remove virtual postings automatically

examples/hledger2beancount.conf

@@ -21,7 +21,3 @@
 # Print beancount output by default.
 [print]
 -O beancount
-
-# Exclude transactions containing unbalanced/virtual postings.
-# You might need to do more if you have mixed balanced/unbalanced transactions.
---real

hledger-lib/Hledger/Write/Beancount.hs

@@ -43,7 +43,7 @@ import Data.Function ((&))
 -- $setup
 -- >>> :set -XOverloadedStrings
 
--- | Like showTransaction, but generates Beancount journal format.
+-- | Like showTransaction, but applies various adjustments to produce valid Beancount journal data.
 showTransactionBeancount :: Transaction -> Text
 showTransactionBeancount t =
   -- https://beancount.github.io/docs/beancount_language_syntax.html

hledger/Hledger/Cli/Commands/Print.hs

@@ -181,23 +181,22 @@ entriesReportAsText = entriesReportAsTextHelper showTransaction
 entriesReportAsTextHelper :: (Transaction -> T.Text) -> EntriesReport -> TL.Text
 entriesReportAsTextHelper showtxn = TB.toLazyText . foldMap (TB.fromText . showtxn)
 
--- In addition to rendering the transactions in (best effort) Beancount format,
--- this generates an account open directive for each account name used
--- (using the earliest transaction date).
+-- This transforms transactions in various ways (see Beancount.hs) to make them Beancount-compatible.
+-- It also generates an account open directive for each account used (on their earliest transaction dates).
 entriesReportAsBeancount :: EntriesReport -> TL.Text
 entriesReportAsBeancount ts =
   -- PERF: gathers and converts all account names, then repeats that work when showing each transaction
-  opendirectives <> "\n" <>
-  entriesReportAsTextHelper showTransactionBeancount ts
+  opendirectives <> "\n" <> entriesReportAsTextHelper showTransactionBeancount allrealts
   where
+    allrealts = [t{tpostings=filter isReal $ tpostings t} | t <- ts]
     opendirectives
       | null ts = ""
       | otherwise = TL.fromStrict $ T.unlines [
           firstdate <> " open " <> accountNameToBeancount a
-          | a <- nubSort $ concatMap (map paccount.tpostings) ts
+          | a <- nubSort $ concatMap (map paccount.tpostings) allrealts
           ]
         where
-          firstdate = showDate $ minimumDef err $ map tdate ts
+          firstdate = showDate $ minimumDef err $ map tdate allrealts
             where err = error' "entriesReportAsBeancount: should not happen"
 
 entriesReportAsSql :: EntriesReport -> TL.Text

hledger/hledger.m4.md

@@ -860,10 +860,8 @@ and prepend/append a "C" when needed.
 
 #### Beancount virtual postings
 
-Beancount doesn't allow [unbalanced/virtual postings](#virtual-postings),
-so you will need to comment those,
-or use `--real` to exclude transactions that use them.
-(If you have transactions which are a mixture of balanced and unbalanced postings, you'll have to do something more.)
+Beancount doesn't allow [virtual postings](#virtual-postings);
+if you have any, they will not appear in beancount output.
 
 #### Beancount costs
 

hledger/test/print/beancount.test

@@ -44,3 +44,18 @@ $ hledger -f- print -O beancount
 
 >=
 
+# ** 4. Virtual postings are dropped.
+<
+2000-01-01
+  Assets  0 USD
+  (a)   1
+  [b]   2
+  [c]
+
+$ hledger -f- print -O beancount
+2000-01-01 open Assets
+
+2000-01-01 *
+    Assets           0 USD
+
+>=