Add `--max-entries` option to `ts` subcommand

README.md

@@ -31,11 +31,10 @@ After building (that took ~40min on 8-core machine) you'll have a shell with `4r
 
 ```
 > 4r --help
-Usage: 4r [-N|--offline] [-A|--no-ansi] [-c|--columns COLUMNS_NUMBER]
+Usage: 4r [-A|--no-ansi] [-c|--columns COLUMNS_NUMBER]
           (COMMAND | COMMAND | COMMAND)
 
 Available options:
-  -N,--offline             only access cache
   -A,--no-ansi             disable ANSI codes
   -c,--columns COLUMNS_NUMBER
                            number of columns
@@ -49,12 +48,12 @@ Available commands:
 
 Usual workflow:
 
-- Print 10 last updated topics: `4r ts | head -20`
+- Print 10 last updated topics: `4r ts -m 10`
 
   Example output:
 
   ```
-  > 4r ts | head -20
+  > 4r ts -m 10
   Переезжаю: @abzyk at 2022-06-27 21:01:10 #31
 
   Пожелания: @nick at 2022-06-27 20:43:34 #20

app/Cli.hs

@@ -24,13 +24,16 @@ data Options = Options
 optsParser :: Parser Options
 optsParser =
   Options <$> switch (long "no-ansi" <> short 'A' <> help "disable ANSI codes")
-          <*> (Just <$> option auto (metavar "COLUMNS_NUMBER" <> long "columns" <> short 'c' <> help "number of columns")
+          <*> (Just <$> option auto (metavar "COLUMNS_NUMBER"
+                                      <> long "columns"
+                                      <> short 'c'
+                                      <> help "number of columns")
                 <|> pure Nothing)
           <*> choiceParser
 
 data Choice = GetSections
-            | GetTopics
-            | GetTopic {topic_id :: Integer}
+            | GetTopics { maxEntries :: Maybe Int }
+            | GetTopic { topic_id :: Integer }
             deriving stock (Show)
 
 choiceParser :: Parser Choice
@@ -41,7 +44,10 @@ choiceParser = foldl1 (<|>)
         (progDesc "Request list of sections")))
   , subparser
       (command "ts" (info
-        (pure GetTopics)
+        (GetTopics <$> (Just <$> option auto (metavar "MAX_ENTRIES_NUMBER"
+                                              <> long "max-entries"
+                                              <> short 'm'
+                                              <> help "max number of entries")))
         (progDesc "Request list of topics")))
   , subparser
       (command "t" (info

app/Main.hs

@@ -45,11 +45,11 @@ program GetSections = do
   sections <- Api.getSections
   withSgr [SetColor Foreground Vivid White] do
     sequenceA_ $ intersperse (putTextLnO "") (printColor <$> sections)
-program GetTopics = do
+program GetTopics{maxEntries} = do
   topics <- Api.getTopics
   withSgr [SetColor Foreground Vivid White] do
     sequenceA_ $ intersperse (putTextLnO "")
-                 (fmap printColor . reverse $ sortBy (comparing (.last_activity_date)) topics)
+                 (fmap printColor . maybe id take maxEntries . reverse $ sortBy (comparing (.last_activity_date)) topics)
 program GetTopic{topic_id} = do
   topic <- Api.getTopic topic_id
   withSgr [SetColor Foreground Vivid White] do