+++ /dev/null
-#! /usr/bin/env racket
-; vim: filetype=racket
-
-; 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
-
-#lang racket
-
-(require openssl/sha1)
-(require racket/date)
-
-(require http-client)
-(require rfc3339-old)
-
-(struct msg (ts_epoch ts_rfc3339 nick uri text))
-(struct feed (nick uri))
-
-(define (concurrent-filter-map num_workers f xs)
- ; TODO switch from mailboxes to channels
- (define (make-worker id f)
- (define parent (current-thread))
- (λ ()
- (define self (current-thread))
- (define (work)
- (thread-send parent (cons 'next self))
- (match (thread-receive)
- ['done (thread-send parent (cons 'exit id))]
- [(cons 'unit x) (begin
- (define y (f x))
- (when y (thread-send parent (cons 'result y)))
- (work))]))
- (work)))
- (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))
- (define threads (map (λ (id) (thread (make-worker id f))) workers))
- (define results (dispatch workers xs '()))
- (for-each thread-wait threads)
- results)
-
-(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))))))
-
-(define (str->lines str)
- (string-split str (regexp "[\r\n]+")))
-
-(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)))
-
-(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?
- (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)
- #f)])
- (define uri (feed-uri feed))
- (str->msgs [feed-nick feed] uri [uri-fetch uri])))
-
-; 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))
-
-(define (str->feeds str)
- (map str->feed (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)))
-
-(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))
-
-(define (main)
- (define user-agent
- (let*
- ([prog-name "tt"]
- [prog-version "0.3.4"]
- [prog-uri "https://github.com/xandkar/tt"]
- [user-feed-file (expand-user-path "~/twtxt-me.txt")]
- [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))]
- )
- (format "~a/~a (~a)" prog-name prog-version user)))
-
- (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 (vector-empty? 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)))
-
-(main)
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