hledger/tools/changelog.hs

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#!/usr/bin/env stack
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{- stack script --resolver lts-18.18
--package data-default
--package extra
--package process
--package text
-}
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{-
--package hledger-lib
-}
-- changelog.hs CHANGELOGFILE
--
-- Manipulate a hledger changelog. Currently does one thing: prompts
-- for a rewrite of the oldest uncategorised pending changelog item
-- and updates the file, printing a diff.
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--
-- My workflow:
-- - In a terminal window (not emacs shell, it will hang) run this on a CHANGES.md file
-- - Edit the changelog item to changelog-readiness (if needed)
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-- - Save and quit (C-x #) to do the next; it will exit after the last.
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-- - On the side keep an auto-reverting editor open on the file to watch progress or for fixups.
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--
-- Motivation:
-- This might seem a bit pointless, but it made this old chore more pleasant.
-- I can make incremental progress by doing just one item, or more as I feel it,
-- without having all the other pending items drag on my attention.
--
-- Limitations/Wishes:
--
-- - Parsing of uncategorised pending items currently assumes the section headings
-- are Features, Improvements, Fixes. This does not work for other section headings,
-- as used in the project changelog. Workaround: add those three headings at the top.
--
-- - It's not obvious how to stop; C-x C-x just loads the next item.
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
-- {-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE RecordWildCards #-}
import Data.Char
import Data.Default
import GHC.Generics
import Data.List.Extra
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-- import qualified Data.Text as T
import System.Environment
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import System.IO.Extra
-- import System.IO
import System.Process
import Text.Printf
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-- import Hledger.Utils (toRegex')
-- A top level section in the changelog, corresponding to one release.
data ChangelogSection = ChangelogSection {
heading :: ChangelogHeading
,unknownitems :: [ChangelogItem]
,featureitems :: [ChangelogItem]
,improvementitems :: [ChangelogItem]
,fixitems :: [ChangelogItem]
}
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deriving (Show, Eq, Generic, Default)
-- The one-line heading for a top level section in the changelog,
-- with the leading #(s) removed.
type ChangelogHeading = String
-- One change description in the changelog, with the list bullet and
-- corresponding indentation removed.
type ChangelogItem = String
main = do
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(f:_) <- getArgs
go f
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go f = do
-- read specified changelog
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(preamble:first:rest) <- splitOn "\n# " <$> readFile f
let
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g = f ++ ".new"
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s@ChangelogSection{} = readSection first
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-- ask for an edit of this item's text
s' <- editOneUnknown s
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if s' == s
then return () -- if it's unchanged, quit
else do
-- otherwise write to a temp file
writeFile g $ init $ unlines $
preamble :
showSection s' :
map ("# "++) rest
-- and show the diff
system' $ printf "diff %s %s" f g
-- and replace the old file
system' $ printf "mv %s %s" g f
-- and repeat
go f
editOneUnknown :: ChangelogSection -> IO ChangelogSection
editOneUnknown s@ChangelogSection{..}
| null unknownitems = return s
| otherwise = do
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let
s' = s{unknownitems=init unknownitems}
u = last unknownitems
new <- textEditEditor u
return $ case new of
'f':'e':'a':'t':':':' ':t -> s'{featureitems = readItem t : featureitems}
'f':'i':'x':':':' ':t -> s'{fixitems = readItem t : fixitems}
'i':'m':'p':':':' ':t -> s'{improvementitems = readItem t : improvementitems}
t -> s'{improvementitems = readItem t : improvementitems}
textEditEditor t = withTempFile $ \f -> do
writeFile f t
ed <- getEnv "EDITOR"
system $ printf "%s %s" ed f
readFile f
-- textEditTty u = do
-- putStrLn "Old:"
-- putStrLn u
-- putStrLn "New: (prefix with feat:/imp:/fix: to categorise, ctrl-d to finish):\n" -- Just an = keeps it unchanged, empty string removes it."
-- getContents
-- Parse a changelog section which may or may not have the Features/Improvements/Fixes subheadings.
readSection :: String -> ChangelogSection
readSection s =
let
(heading,rest) = break (=='\n') s
parts = splitOn "\nFeatures\n" rest
(unknownitems, featureitems, improvementitems, fixitems) =
case parts of
[] -> ([], [], [], [])
[u] -> (readItems u, [], [], [])
(u:xs:_) -> (readItems u, readItems f, readItems i, readItems x)
where
(f:ys:_) = splitOn "\nImprovements\n" xs
(i:x:_) = splitOn "\nFixes\n" ys
in ChangelogSection{..}
where
readItems = map readItem . filter (not.all isSpace) . splitOn "\n- "
showSection ChangelogSection{..} =
unlines $
[("# "++heading), ""]
++ map showItem unknownitems
++ ["Features", ""]
++ map showItem featureitems
++ ["Improvements", ""]
++ map showItem improvementitems
++ ["Fixes", ""]
++ map showItem fixitems
readItem :: String -> ChangelogItem
readItem "" = def
readItem s =
let
(first:rest) = lines s
stripto2spaces (' ':' ':t) = t
stripto2spaces (' ':t) = t
stripto2spaces t = t
in unlines $
first :
map stripto2spaces rest
showItem "" = ""
showItem i =
let (first:rest) = lines i
in unlines $ ("- "++first) : map (" "++) rest
system' s = putStrLn s >> system s
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-- re = toRegex' . T.pack