-; TODO optional text wrap
-; TODO write
-; TODO caching (use cache by default, unless explicitly asked for update)
-; - [x] value --> cache
-; - [ ] value <-- cache
-; requires: commands
-; TODO timeline limits
-; TODO feed set operations (perhaps better done externally?)
-; TODO timeline as a result of a query (feed set op + filter expressions)
-; TODO named timelines
-; TODO CLI params
-; TODO config files
-; TODO parse "following" from feed
-; - following = <nick> <uri>
-; TODO parse mentions:
-; - @<source.nick source.url> | @<source.url>
-; TODO highlight mentions
-; TODO filter on mentions
-; TODO highlight hashtags
-; TODO filter on hashtags
-; TODO hashtags as channels? initial hashtag special?
-; TODO query language
-; TODO console logger colors by level ('error)
-; TODO file logger ('debug)
-; TODO commands:
-; - r | read
-; - see timeline ops above
-; - w | write
-; - arg or stdin
-; - nick expand to URI
-; - q | query
-; - see timeline ops above
-; - see hashtag and channels above
-; - d | download
-; - u | upload
-; - calls user-configured command to upload user's own feed file to their server
-;
-; Looks like a better CLI parser than "racket/cmdline":
-; https://docs.racket-lang.org/natural-cli/
-
-#lang racket
+#lang typed/racket/no-check
(require openssl/sha1)
(require racket/date)
+(require
+ net/http-client
+ net/uri-codec
+ net/url-string
+ net/url-structs)
-(require http-client)
-(require rfc3339-old)
+(require (prefix-in info: "info.rkt"))
(module+ test
(require rackunit))
-(struct msg (ts_epoch ts_rfc3339 nick uri text))
-(struct feed (nick uri))
+(define-type Url
+ net/url-structs:url)
-(define (concurrent-filter-map num_workers f xs)
+(define-type Out-Format
+ (U 'single-line
+ 'multi-line))
+
+(define-type Timeline-Order
+ (U 'old->new
+ 'new->old))
+
+(struct msg
+ ([ts-epoch : Integer]
+ [ts-orig : String]
+ [nick : (Option String)]
+ [uri : Url]
+ [text : String]
+ [mentions : (Listof Peer)])
+ #:type-name Msg)
+
+(struct Peer
+ ([nick : (Option String)]
+ [uri : Url]))
+
+(: tt-home-dir Path-String)
+(define tt-home-dir (build-path (expand-user-path "~") ".tt"))
+
+(: concurrent-filter-map (∀ (α β) (-> Natural (-> α β) (Listof α))))
+(define (concurrent-filter-map num-workers f xs)
; TODO preserve order of elements OR communicate that reorder is expected
; TODO switch from mailboxes to channels
(define (make-worker id f)
(define parent (current-thread))
(λ ()
- (define self (current-thread))
+ (define self : Thread (current-thread))
+ (: work (∀ (α) (-> α)))
(define (work)
(thread-send parent (cons 'next self))
(match (thread-receive)
(when y (thread-send parent (cons 'result y)))
(work))]))
(work)))
+ (: dispatch (∀ (α β) (-> (Listof Nonnegative-Integer) (Listof α) (Listof β))))
(define (dispatch ws xs ys)
(if (empty? ws)
- ys
- (match (thread-receive)
- [(cons 'exit w) (dispatch (remove w ws =) xs ys)]
- [(cons 'result y) (dispatch ws xs (cons y ys))]
- [(cons 'next thd) (match xs
- ['() (begin
- (thread-send thd 'done)
- (dispatch ws xs ys))]
- [(cons x xs) (begin
- (thread-send thd (cons 'unit x))
- (dispatch ws xs ys))])])))
- (define workers (range num_workers))
+ ys
+ (match (thread-receive)
+ [(cons 'exit w) (dispatch (remove w ws =) xs ys)]
+ [(cons 'result y) (dispatch ws xs (cons y ys))]
+ [(cons 'next thd) (match xs
+ ['() (begin
+ (thread-send thd 'done)
+ (dispatch ws xs ys))]
+ [(cons x xs) (begin
+ (thread-send thd (cons 'unit x))
+ (dispatch ws xs ys))])])))
+ (define workers (range num-workers))
(define threads (map (λ (id) (thread (make-worker id f))) workers))
(define results (dispatch workers xs '()))
(for-each thread-wait threads)
results)
(module+ test
- (define n-workers 10)
- (define given (list
- (λ (x) (if (even? x) x #f))
- (range 11)))
- (check-equal?
- (sort (apply concurrent-filter-map (cons n-workers given)) <)
- (sort (apply filter-map given ) <)))
-
-(define (msg-print out-format odd msg)
- (printf
- (match out-format
- ['single-line "~a \033[1;37m<~a ~a>\033[0m \033[0;~am~a\033[0m~n"]
- ['multi-line "~a~n\033[1;37m<~a ~a>\033[0m~n\033[0;~am~a\033[0m~n~n"]
- [_ (raise (format "Invalid output format: ~a" out-format))])
- (date->string (seconds->date [msg-ts_epoch msg]) #t)
- (msg-nick msg)
- (msg-uri msg)
- (if odd 36 33)
- (msg-text msg)))
-
-(define re-msg-begin
- ; TODO Zulu offset. Maybe in several formats. Which ones?
- (pregexp "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}"))
-
-(define (str->msg nick uri str)
- (if (not (regexp-match? re-msg-begin str))
- (begin
- (log-debug "Non-msg line from nick:~a, line:~a" nick str)
- #f)
- (let ([toks (string-split str (regexp "\t+"))])
- (if (not (= 2 (length toks)))
- (begin
- (log-warning "Invalid msg line from nick:~a, msg:~a" nick str)
- #f)
- (let*
- ([ts_rfc3339 (first toks)]
- [text (second toks)]
- [t (string->rfc3339-record ts_rfc3339)]
- ; TODO handle tz offset
- [ts_epoch (find-seconds [rfc3339-record:second t]
- [rfc3339-record:minute t]
- [rfc3339-record:hour t]
- [rfc3339-record:mday t]
- [rfc3339-record:month t]
- [rfc3339-record:year t])])
- (msg ts_epoch ts_rfc3339 nick uri text))))))
+ (let* ([f (λ (x) (if (even? x) x #f))]
+ [xs (range 11)]
+ [actual (sort (concurrent-filter-map 10 f xs) <)]
+ [expected (sort ( filter-map f xs) <)])
+ (check-equal? actual expected "concurrent-filter-map")))
+
+(: msg-print (-> Out-Format Integer Msg Void))
+(define msg-print
+ (let* ([colors (vector 36 33)]
+ [n (vector-length colors)])
+ (λ (out-format color-i msg)
+ (let ([color (vector-ref colors (modulo color-i n))]
+ [nick (msg-nick msg)]
+ [uri (url->string (msg-uri msg))]
+ [text (msg-text msg)]
+ [mentions (msg-mentions msg)])
+ (match out-format
+ ['single-line
+ (let ([nick (if nick nick uri)])
+ (printf "~a \033[1;37m<~a>\033[0m \033[0;~am~a\033[0m~n"
+ (parameterize
+ ([date-display-format 'iso-8601])
+ (date->string (seconds->date [msg-ts-epoch msg]) #t))
+ nick color text))]
+ ['multi-line
+ (let ([nick (if nick (string-append nick " ") "")])
+ (printf "~a (~a)~n\033[1;37m<~a~a>\033[0m~n\033[0;~am~a\033[0m~n~n"
+ (parameterize
+ ([date-display-format 'rfc2822])
+ (date->string (seconds->date [msg-ts-epoch msg]) #t))
+ (msg-ts-orig msg)
+ nick uri color text))])))))
+
+(: rfc3339->epoch (-> String (Option Nonnegative-Integer)))
+(define rfc3339->epoch
+ (let ([re (pregexp "^([0-9]{4})-([0-9]{2})-([0-9]{2})T([0-9]{2}):([0-9]{2})(:([0-9]{2}))?(\\.[0-9]+)?(Z|([+-])([0-9]{1,2}):?([0-9]{2}))?$")])
+ (λ (ts)
+ (match (regexp-match re ts)
+ [(list _wholething yyyy mm dd HH MM _:SS SS _fractional tz-whole tz-sign tz-HH tz-MM)
+ (let*
+ ([tz-offset
+ (match* (tz-whole tz-sign tz-HH tz-MM)
+ [("Z" #f #f #f)
+ 0]
+ [(_ (or "-" "+") (? identity h) (? identity m))
+ (let ([h (string->number h)]
+ [m (string->number m)]
+ ; Reverse to get back to UTC:
+ [op (match tz-sign ["+" -] ["-" +])])
+ (op 0 (+ (* 60 m) (* 60 (* 60 h)))))]
+ [(a b c d)
+ (log-warning "Impossible TZ string: ~v, components: ~v ~v ~v ~v" tz-whole a b c d)
+ 0])]
+ [ts-orig ts]
+ [local-time? #f]
+ [ts-epoch (find-seconds (if SS (string->number SS) 0)
+ (string->number MM)
+ (string->number HH)
+ (string->number dd)
+ (string->number mm)
+ (string->number yyyy)
+ local-time?)])
+ (+ ts-epoch tz-offset))]
+ [_
+ (log-error "Invalid timestamp: ~v" ts)
+ #f]))))
+
+(: str->msg (-> (Option String) Url String (Option Msg)))
+(define str->msg
+ (let ([re (pregexp "^([^\\s\t]+)[\\s\t]+(.*)$")])
+ (λ (nick uri str)
+ (with-handlers*
+ ([exn:fail?
+ (λ (e)
+ (log-error
+ "Failed to parse msg: ~v, from: ~v, at: ~v, because: ~v"
+ str nick (url->string uri) e)
+ #f)])
+ (match (regexp-match re str)
+ [(list _wholething ts-orig text)
+ (let ([ts-epoch (rfc3339->epoch ts-orig)])
+ (if ts-epoch
+ (let ([mentions
+ (filter-map
+ (λ (m) (match (regexp-match #px"@<([^>]+)>" m)
+ [(list _wholething nick-uri)
+ (str->peer nick-uri)]))
+ (regexp-match* #px"@<[^\\s]+([\\s]+)?[^>]+>" text))])
+ (msg ts-epoch ts-orig nick uri text mentions))
+ (begin
+ (log-error
+ "Msg rejected due to invalid timestamp: ~v, nick:~v, uri:~v"
+ str nick (url->string uri))
+ #f)))]
+ [_
+ (log-debug "Non-msg line from nick:~v, line:~a" nick str)
+ #f])))))
+
+(module+ test
+ ; TODO Test for when missing-nick case
+ (let* ([tzs (for*/list ([d '("-" "+")]
+ [h '("5" "05")]
+ [m '("00" ":00" "57" ":57")])
+ (string-append d h m))]
+ [tzs (list* "" "Z" tzs)])
+ (for* ([n '("fake-nick")]
+ [u '("fake-uri")]
+ [s '("" ":10")]
+ [f '("" ".1337")]
+ [z tzs]
+ [sep (list "\t" " ")]
+ [txt '("foo bar baz" "'jaz poop bear giraffe / tea" "@*\"``")])
+ (let* ([ts (string-append "2020-11-18T22:22"
+ (if (non-empty-string? s) s ":00")
+ z)]
+ [m (str->msg n u (string-append ts sep txt))])
+ (check-not-false m)
+ (check-equal? (msg-nick m) n)
+ (check-equal? (msg-uri m) u)
+ (check-equal? (msg-text m) txt)
+ (check-equal? (msg-ts-orig m) ts (format "Given: ~v" ts))
+ )))
+
+ (let* ([ts "2020-11-18T22:22:09-0500"]
+ [tab " "]
+ [text "Lorem ipsum"]
+ [nick "foo"]
+ [uri "bar"]
+ [actual (str->msg nick uri (string-append ts tab text))]
+ [expected (msg 1605756129 ts nick uri text)])
+ (check-equal?
+ (msg-ts-epoch actual)
+ (msg-ts-epoch expected)
+ "str->msg ts-epoch")
+ (check-equal?
+ (msg-ts-orig actual)
+ (msg-ts-orig expected)
+ "str->msg ts-orig")
+ (check-equal?
+ (msg-nick actual)
+ (msg-nick expected)
+ "str->msg nick")
+ (check-equal?
+ (msg-uri actual)
+ (msg-uri expected)
+ "str->msg uri")
+ (check-equal?
+ (msg-text actual)
+ (msg-text expected)
+ "str->msg text")))
+(: str->lines (-> String (Listof String)))
(define (str->lines str)
(string-split str (regexp "[\r\n]+")))
+(module+ test
+ (check-equal? (str->lines "abc\ndef\n\nghi") '("abc" "def" "ghi")))
+
+(: str->msgs (-> (Option String) Url String (Listof Msg)))
(define (str->msgs nick uri str)
- (filter-map (λ (line) (str->msg nick uri line)) (str->lines str)))
-
-(define (hash-sha1 str)
- (define in (open-input-string str))
- (define digest (sha1 in))
- (close-input-port in)
- digest)
-
-(define (uri-fetch uri)
- (log-info "GET ~a" uri)
- (define resp (http-get uri))
- (define status (http-response-code resp))
- (define body (http-response-body resp))
- (log-debug "finished GET ~a status:~a body length:~a"
- uri status (string-length body))
- ; TODO Handle redirects
- (if (= status 200)
- (let*
- ([url-digest
- (hash-sha1 uri)]
- [cache-file-path
- (expand-user-path (string-append "~/.tt/cache/" url-digest))])
- (display-to-file
- body cache-file-path
- #:exists 'replace)
- body)
- ; TODO A more-informative exception
- (raise status)))
+ (filter-map (λ (line) (str->msg nick uri line)) (filter-comments (str->lines str))))
-(define (timeline-print out-format timeline)
- (for ([msg timeline]
- [i (in-naturals)])
- (msg-print out-format (odd? i) msg)))
-
-(define (feed->msgs feed)
- (log-info "downloading feed nick:~a uri:~a"
- (feed-nick feed)
- (feed-uri feed))
- (with-handlers
- ([exn:fail:network?
+(: cache-dir Path-String)
+(define cache-dir (build-path tt-home-dir "cache"))
+
+(: url->cache-file-path-v1 (-> Url Path-String))
+(define (url->cache-file-path-v1 uri)
+ (define (hash-sha1 str) : (-> String String)
+ (define in (open-input-string str))
+ (define digest (sha1 in))
+ (close-input-port in)
+ digest)
+ (build-path cache-dir (hash-sha1 (url->string uri))))
+
+(: url->cache-file-path-v2 (-> Url Path-String))
+(define (url->cache-file-path-v2 uri)
+ (build-path cache-dir (uri-encode (url->string uri))))
+
+(define url->cache-file-path url->cache-file-path-v2)
+
+; TODO Return Option
+(: uri-read-cached (-> Url String))
+(define (uri-read-cached uri)
+ (define path-v1 (url->cache-file-path-v1 uri))
+ (define path-v2 (url->cache-file-path-v2 uri))
+ (when (file-exists? path-v1)
+ (rename-file-or-directory path-v1 path-v2 #t))
+ (if (file-exists? path-v2)
+ (file->string path-v2)
+ (begin
+ (log-warning "Cache file not found for URI: ~a" (url->string uri))
+ "")))
+
+(: str->peer (String (Option Peer)))
+(define (str->peer str)
+ (log-debug "Parsing peer string: ~v" str)
+ (with-handlers*
+ ([exn:fail?
(λ (e)
- (log-error "network error nick:~a uri:~a exn:~a"
- (feed-nick feed)
- (feed-uri feed)
- e)
- #f)]
- [integer?
- (λ (status)
- (log-error "http error nick:~a uri:~a status:~a"
- (feed-nick feed)
- (feed-uri feed)
- status)
+ (log-error "Invalid URI in string: ~v, exn: ~v" str e)
#f)])
- (define uri (feed-uri feed))
- (str->msgs [feed-nick feed] uri [uri-fetch uri])))
+ (match (string-split str)
+ [(list u) (Peer #f (string->url u))]
+ [(list n u) (Peer n (string->url u))]
+ [_
+ (log-error "Invalid peer string: ~v" str)
+ #f])))
-; TODO timeline contract : time-sorted list of messages
-(define (timeline num_workers feeds)
- (sort (append* (concurrent-filter-map num_workers feed->msgs feeds))
- (λ (a b) [< (msg-ts_epoch a) (msg-ts_epoch b)])))
-(define (str->feed str)
- ; TODO validation
- (define toks (string-split str))
- (apply feed toks))
+(: filter-comments (-> (Listof String) (Listof String)))
+(define (filter-comments lines)
+ (filter-not (λ (line) (string-prefix? line "#")) lines))
-(define (str->feeds str)
- (map str->feed (str->lines str)))
+(: str->peers (-> String (Listof Peer)))
+(define (str->peers str)
+ (filter-map str->peer (filter-comments (str->lines str))))
-(define (file->feeds filename)
- (str->feeds (file->string filename)))
-
-(define (we-are-twtxt)
- (define uri
- "https://raw.githubusercontent.com/mdom/we-are-twtxt/master/we-are-twtxt.txt")
- (str->feeds (uri-fetch uri)))
+(: file->peers (-> Path-String (Listof Peer)))
+(define (file->peers filename)
+ (str->peers (file->string filename)))
+(: user-agent String)
(define user-agent
(let*
([prog-name "tt"]
- [prog-version "0.3.5"]
+ [prog-version (info:#%info-lookup 'version)]
[prog-uri "https://github.com/xandkar/tt"]
- [user-feed-file (expand-user-path "~/twtxt-me.txt")]
+ [user-peer-file (build-path tt-home-dir "me")]
[user
- (if (file-exists? user-feed-file)
- (let ([user (first (file->feeds user-feed-file))])
- (format "+~a; @~a" (feed-uri user) (feed-nick user)))
- (format "+~a" prog-uri))]
- )
+ (if (file-exists? user-peer-file)
+ (match (first (file->peers user-peer-file))
+ [(Peer #f u) (format "+~a" (url->string u) )]
+ [(Peer n u) (format "+~a; @~a" (url->string u) n)])
+ (format "+~a" prog-uri))])
(format "~a/~a (~a)" prog-name prog-version user)))
+(: uri-download (-> Url Void))
+(define (uri-download u)
+ (define cache-file-path (url->cache-file-path u))
+ (log-debug "uri-download ~v into ~v" u cache-file-path)
+ (match* ((url-scheme u) (url-host u) (url-port u))
+ [(s h p)
+ #:when (and s h)
+ (define ssl? (string=? s "https"))
+ (define-values (status-line headers body-input)
+ ; TODO Timeout. Currently hangs on slow connections.
+ (http-sendrecv
+ h
+ (url->string (struct-copy url u [scheme #f] [host #f]))
+ #:ssl? ssl?
+ #:port (cond [p p] [ssl? 443] [else 80])
+ #:headers (list (format "User-Agent: ~a" user-agent))
+ ))
+ (log-debug "headers: ~v" headers)
+ (log-debug "status-line: ~v" status-line)
+ (define status
+ (string->number (second (string-split (bytes->string/utf-8 status-line)))))
+ (log-debug "status: ~v" status)
+ ; TODO Handle redirects
+ (if (= 200 status)
+ (begin
+ (make-parent-directory* cache-file-path)
+ (call-with-output-file cache-file-path
+ (curry copy-port body-input)
+ #:exists 'replace))
+ (raise status))]
+ [(_ _ _)
+ (log-error "Invalid URI: ~v" u)]))
+
+(: timeline-print (-> Out-Format (Listof Msg) Void))
+(define (timeline-print out-format timeline)
+ (void (foldl (match-lambda**
+ [((and m (msg _ _ nick _ _ _)) (cons prev-nick i))
+ (let ([i (if (equal? prev-nick nick) i (+ 1 i))])
+ (msg-print out-format i m)
+ (cons nick i))])
+ (cons "" 0)
+ timeline)))
+
+(: peer->msgs (-> Peer (Listof Msg)))
+(define (peer->msgs f)
+ (match-define (Peer nick uri) f)
+ (log-info "Reading peer nick:~v uri:~v" nick (url->string uri))
+ (str->msgs nick uri (uri-read-cached uri)))
+
+(: peer-download (-> Peer Void))
+(define (peer-download f)
+ (match-define (Peer nick uri) f)
+ (define u (url->string uri))
+ (log-info "Downloading peer uri:~a" u)
+ (with-handlers
+ ([exn:fail?
+ (λ (e)
+ (log-error "Network error nick:~v uri:~v exn:~v" nick u e)
+ #f)]
+ [integer?
+ (λ (status)
+ (log-error "HTTP error nick:~v uri:~a status:~a" nick u status)
+ #f)])
+ (define-values (_result _tm-cpu-ms tm-real-ms _tm-gc-ms)
+ (time-apply uri-download (list uri)))
+ (log-info "Peer downloaded in ~a seconds, uri: ~a" (/ tm-real-ms 1000.0) u)))
+
+(: timeline-download (-> Integer (Listof Peer) Void))
+(define (timeline-download num-workers peers)
+ ; TODO No need for map - can just iter
+ (void (concurrent-filter-map num-workers peer-download peers)))
+
+; TODO timeline contract : time-sorted list of messages
+(: timeline-read (-> Timeline-Order (Listof Peer) (Listof Msg)))
+(define (timeline-read order peers)
+ (define cmp (match order
+ ['old->new <]
+ ['new->old >]))
+ (sort (append* (filter-map peer->msgs peers))
+ (λ (a b) (cmp (msg-ts-epoch a) (msg-ts-epoch b)))))
+
+(: log-writer-stop (-> Thread Void))
+(define (log-writer-stop log-writer)
+ (log-message (current-logger) 'fatal 'stop "Exiting." #f)
+ (thread-wait log-writer))
+
+(: logger-start (-> Log-Level Thread))
+(define (logger-start level)
+ (let* ([logger
+ (make-logger #f #f level #f)]
+ [log-receiver
+ (make-log-receiver logger level)]
+ [log-writer
+ (thread
+ (λ ()
+ (parameterize
+ ([date-display-format 'iso-8601])
+ (let loop ()
+ (match-define (vector level msg _ topic) (sync log-receiver))
+ (unless (equal? topic 'stop)
+ (eprintf "~a [~a] ~a~n" (date->string (current-date) #t) level msg)
+ (loop))))))])
+ (current-logger logger)
+ log-writer))
+
(module+ main
- (define (setup-logging)
- (define logger (make-logger #f #f 'debug #f))
- (define log-chan (make-log-receiver logger 'debug))
- (void (thread (λ ()
- [date-display-format 'iso-8601]
- [let loop ()
- (define data (sync log-chan))
- (define level (vector-ref data 0))
- (define msg (vector-ref data 1))
- (define ts (date->string (current-date) #t))
- (eprintf "~a [~a] ~a~n" ts level msg)
- (loop)])))
- (current-logger logger))
-
- (setup-logging)
- (current-http-response-auto #f)
- (current-http-user-agent user-agent)
- (date-display-format 'rfc2822)
-
- (define args (current-command-line-arguments))
- (define feeds
- (if (= 0 (vector-length args))
- (we-are-twtxt)
- (file->feeds (vector-ref args 0))))
- (define out-format 'multi-line)
- (define num_workers 15) ; 15 was fastest out of the tried 1, 5, 10, 15 and 20.
- (timeline-print out-format (timeline num_workers feeds)))
+ (let ([log-level 'info])
+ (command-line
+ #:program
+ "tt"
+ #:once-each
+ [("-d" "--debug")
+ "Enable debug log level."
+ (set! log-level 'debug)]
+ #:help-labels
+ ""
+ "and <command> is one of"
+ "r, read i : Read the timeline."
+ "d, download : Download the timeline."
+ ; TODO Add path dynamically
+ "u, upload : Upload your twtxt file (alias to execute ~/.tt/upload)."
+ ""
+ #:args (command . args)
+ (define log-writer (logger-start log-level))
+ (current-command-line-arguments (list->vector args))
+ (match command
+ [(or "d" "download")
+ ; Initially, 15 was fastest out of the tried: 1, 5, 10, 20. Then I
+ ; started noticing significant slowdowns. Reducing to 5 seems to help.
+ (let ([num-workers 5])
+ (command-line
+ #:program
+ "tt download"
+ #:once-each
+ [("-j" "--jobs")
+ njobs "Number of concurrent jobs."
+ (set! num-workers (string->number njobs))]
+ #:args (filename)
+ (define-values (_res _cpu real-ms _gc)
+ (time-apply timeline-download (list num-workers (file->peers filename))))
+ (log-info "Timeline downloaded in ~a seconds." (/ real-ms 1000.0))
+ (log-writer-stop log-writer)))]
+ [(or "u" "upload")
+ (command-line
+ #:program
+ "tt upload"
+ #:args ()
+ (if (system (path->string (build-path tt-home-dir "upload")))
+ (exit 0)
+ (exit 1)))]
+ [(or "r" "read")
+ (let ([out-format 'multi-line]
+ [order 'old->new])
+ (command-line
+ #:program
+ "tt read"
+ #:once-each
+ [("-r" "--rev")
+ "Reverse displayed timeline order."
+ (set! order 'new->old)]
+ #:once-any
+ [("-s" "--short")
+ "Short output format"
+ (set! out-format 'single-line)]
+ [("-l" "--long")
+ "Long output format"
+ (set! out-format 'multi-line)]
+ #:args (filename)
+ (timeline-print out-format (timeline-read order (file->peers filename)))))]
+ ))))
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