reg: --related/-r flag to show other postings in the transaction

MANUAL.md

@@ -760,6 +760,9 @@ this is 80 characters. To allow more space for descriptions and account
 names, use `-w` to increase the width to 120 characters, or `-wN` to set
 any desired width (at least 50 recommended).
 
+The `--related`/`-r` flag shows the *other* postings in the transactions
+of the postings which would normally be shown.
+
 #### balance
 
 The balance command displays accounts and their balances, indented to show the account hierarchy.

hledger-lib/Hledger/Data/Journal.hs

@@ -364,7 +364,7 @@ journalFinalise tclock tlocal path txt ctx j@Journal{files=fs} =
 -- depends on display precision. Reports only the first error encountered.
 journalBalanceTransactions :: Journal -> Either String Journal
 journalBalanceTransactions j@Journal{jtxns=ts, jcommoditystyles=ss} =
-  case sequence $ map balance ts of Right ts' -> Right j{jtxns=ts'}
+  case sequence $ map balance ts of Right ts' -> Right j{jtxns=map txnTieKnot ts'}
                                     Left e    -> Left e
       where balance = balanceTransaction (Just ss)
 

hledger-lib/Hledger/Data/Posting.hs

@@ -21,6 +21,7 @@ module Hledger.Data.Posting (
   hasAmount,
   postingAllTags,
   transactionAllTags,
+  relatedPostings,
   -- * date operations
   postingDate,
   postingDate2,
@@ -149,6 +150,11 @@ postingAllTags p = ptags p ++ maybe [] transactionAllTags (ptransaction p)
 transactionAllTags :: Transaction -> [Tag]
 transactionAllTags t = ttags t
 
+-- Get the other postings from this posting's transaction.
+relatedPostings :: Posting -> [Posting]
+relatedPostings p@Posting{ptransaction=Just t} = filter (/= p) $ tpostings t
+relatedPostings _ = []
+
 -- | Does this posting fall within the given date span ?
 isPostingInDateSpan :: DateSpan -> Posting -> Bool
 isPostingInDateSpan s = spanContainsDate s . postingDate

hledger-lib/Hledger/Data/Transaction.hs

@@ -264,7 +264,7 @@ balanceTransaction styles t@Transaction{tpostings=ps}
     | length rwithoutamounts > 1 || length bvwithoutamounts > 1
         = Left $ printerr "could not balance this transaction (too many missing amounts)"
     | not $ isTransactionBalanced styles t''' = Left $ printerr $ nonzerobalanceerror t'''
-    | otherwise = Right t'''
+    | otherwise = Right t''''
     where
       -- maybe infer missing amounts
       (rwithamounts, rwithoutamounts)   = partition hasAmount $ realPostings t
@@ -329,6 +329,9 @@ balanceTransaction styles t@Transaction{tpostings=ps}
                         bvamountsinunpricedcommodity = filter ((==unpricedcommodity).acommodity) bvamountsinorder
             inferprice p = p
 
+      -- tie the knot so eg relatedPostings works right
+      t'''' = txnTieKnot t'''
+
       printerr s = intercalate "\n" [s, showTransactionUnelided t]
 
 nonzerobalanceerror :: Transaction -> String

hledger-lib/Hledger/Reports.hs

@@ -91,6 +91,7 @@ data ReportOpts = ReportOpts {
     ,quarterly_      :: Bool
     ,yearly_         :: Bool
     ,format_         :: Maybe FormatStr
+    ,related_        :: Bool
     ,query_          :: String -- all arguments, as a string
  } deriving (Show)
 
@@ -120,6 +121,7 @@ defreportopts = ReportOpts
     def
     def
     def
+    def
 
 instance Default ReportOpts where def = defreportopts
 
@@ -259,7 +261,8 @@ postingsReport opts q j = -- trace ("q: "++show q++"\nq': "++show q') $
       wd = whichDateFromOpts opts
       -- delay depth filtering until the end
       (depth, q') = (queryDepth q, filterQuery (not . queryIsDepth) q)
-      (precedingps, displayableps, _) =   dbg "ps3" $ postingsMatchingDisplayExpr (display_ opts)
+      (precedingps, displayableps, _) =   dbg "ps4" $ postingsMatchingDisplayExpr displayexpr
+                                        $ dbg "ps3" $ (if related_ opts then concatMap relatedPostings else id)
                                         $ dbg "ps2" $ filter (q' `matchesPosting`)
                                         $ dbg "ps1" $ journalPostings j'
       dbg :: Show a => String -> a -> a

hledger/Hledger/Cli/Options.hs

@@ -215,6 +215,7 @@ postingsmode = (commandmode ["register","postings"]) {
  ,modeGroupFlags = Group {
      groupUnnamed = [
       flagOpt (show defaultWidthWithFlag) ["width","w"] (\s opts -> Right $ setopt "width" s opts) "N" "increase or set the output width (default: 80)"
+     ,flagNone ["related","r"] (\opts -> setboolopt "related" opts) "show the other postings in the transactions of those that would have been shown"
      ]
     ,groupHidden = []
     ,groupNamed = [(generalflagstitle, generalflags1)]
@@ -349,6 +350,7 @@ toCliOpts rawopts = do
                             ,quarterly_ = boolopt "quarterly" rawopts
                             ,yearly_    = boolopt "yearly" rawopts
                             ,format_    = maybestringopt "format" rawopts
+                            ,related_   = boolopt "related" rawopts  -- register
                             ,query_     = unwords $ listofstringopt "args" rawopts
                             }
              }