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4764ff89 SK |
1 | #! /usr/bin/env racket |
2 | ; vim: filetype=racket | |
3 | ||
d6a187b7 SK |
4 | ; TODO write |
5 | ; TODO caching (use cache by default, unless explicitly asked for update) | |
6 | ; TODO timeline limits | |
7 | ; TODO user-defined feed sets (a la twitter lists) | |
8 | ; TODO feed set operations | |
9 | ; TODO timeline as a result of a query (feed set op + filter expressions) | |
10 | ; TODO named timelines | |
11 | ; TODO CLI params | |
12 | ; TODO config files | |
13 | ; TODO highlight mentions | |
14 | ; TODO filter on mentions | |
15 | ; TODO highlight hashtags | |
16 | ; TODO filter on hashtags | |
e0e0fb20 | 17 | ; TODO hashtags as channels? initial hashtag special? |
d6a187b7 | 18 | ; TODO query language |
78a5f475 | 19 | ; TODO concurrency |
e0e0fb20 SK |
20 | ; TODO console logger colors by level ('error) |
21 | ; TODO file logger ('debug) | |
dbccadf9 SK |
22 | ; TODO commands: |
23 | ; - r | read | |
24 | ; - see timeline ops above | |
25 | ; - w | write | |
26 | ; - nick expand to URI | |
27 | ; - q | query | |
28 | ; - see timeline ops above | |
29 | ; - see hashtag and channels above | |
84152e25 SK |
30 | ; TODO user-agent format: <client>/<version> (+<source.url>; @<source.nick>) |
31 | ; - requires configurability | |
32 | ; - ref: https://twtxt.readthedocs.io/en/latest/user/discoverability.html | |
d6a187b7 | 33 | |
4764ff89 SK |
34 | #lang racket |
35 | ||
36 | (require racket/date) | |
37 | ||
38 | (require http-client) | |
39 | (require rfc3339-old) | |
40 | ||
41 | (struct msg (tm_epoch tm_rfc3339 nick text)) | |
42 | (struct feed (nick uri)) | |
43 | ||
e96264cc SK |
44 | (define (msg-print odd m) |
45 | (printf "~a \033[1;37m<~a>\033[0m \033[0;~am~a\033[0m~n" | |
46 | (date->string (seconds->date [msg-tm_epoch m]) #t) | |
47 | [msg-nick m] | |
48 | [if odd 36 33] | |
49 | [msg-text m])) | |
50 | ||
51 | (define re-msg-begin | |
52 | ; TODO Zulu offset. Maybe in several formats. Which ones? | |
53 | (pregexp "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}")) | |
88d50b3e SK |
54 | |
55 | (define (str->msg nick str) | |
56 | (if (not (regexp-match? re-msg-begin str)) | |
57 | (begin | |
58 | (log-debug "Non-msg line from nick:~a, line:~a" nick str) | |
59 | #f) | |
60 | (let ([toks (string-split str (regexp "\t+"))]) | |
61 | (if (not (= 2 (length toks))) | |
62 | (begin | |
63 | (log-warning "Invalid msg line from nick:~a, msg:~a" nick str) | |
64 | #f) | |
65 | (let* | |
66 | ([tm_rfc3339 (list-ref toks 0)] | |
67 | [tok_text (list-ref toks 1)] | |
68 | [t (string->rfc3339-record tm_rfc3339)] | |
69 | ; TODO handle tz offset | |
70 | [tm_epoch (find-seconds [rfc3339-record:second t] | |
71 | [rfc3339-record:minute t] | |
72 | [rfc3339-record:hour t] | |
73 | [rfc3339-record:mday t] | |
74 | [rfc3339-record:month t] | |
75 | [rfc3339-record:year t])]) | |
76 | (msg tm_epoch tm_rfc3339 nick tok_text)))))) | |
77 | ||
e96264cc SK |
78 | (define (str->lines str) |
79 | (string-split str (regexp "[\r\n]+"))) | |
80 | ||
88d50b3e SK |
81 | (define (str->msgs nick str) |
82 | (filter-map (λ (line) (str->msg nick line)) (str->lines str))) | |
4764ff89 SK |
83 | |
84 | (define (uri-fetch uri) | |
85 | (log-info "GET ~a" uri) | |
86 | (define resp (http-get uri)) | |
87 | (define status (http-response-code resp)) | |
88 | (define body (http-response-body resp)) | |
89 | (log-debug "finished GET ~a status:~a body length:~a" | |
90 | uri status (string-length body)) | |
91 | ; TODO Handle redirects | |
92 | (if (= status 200) body (raise status))) | |
93 | ||
4764ff89 SK |
94 | (define (timeline-print timeline) |
95 | (for ([msg timeline] | |
96 | [i (in-naturals)]) | |
97 | (msg-print (odd? i) msg))) | |
98 | ||
9a6a9f9a SK |
99 | (define (feed->msgs feed) |
100 | (log-info "downloading feed nick:~a uri:~a" | |
101 | (feed-nick feed) | |
102 | (feed-uri feed)) | |
103 | (with-handlers | |
104 | ([exn:fail:network? | |
105 | (λ (e) | |
106 | (log-error "network error nick:~a uri:~a exn:~a" | |
107 | (feed-nick feed) | |
108 | (feed-uri feed) | |
109 | e) | |
110 | #f)] | |
111 | [integer? | |
112 | (λ (status) | |
113 | (log-error "http error nick:~a uri:~a status:~a" | |
114 | (feed-nick feed) | |
115 | (feed-uri feed) | |
116 | status) | |
117 | #f)]) | |
118 | (str->msgs [feed-nick feed] [uri-fetch (feed-uri feed)]))) | |
119 | ||
120 | ; TODO timeline contract : time-sorted list of messages | |
4764ff89 | 121 | (define (timeline feeds) |
9a6a9f9a SK |
122 | (sort (append* (filter-map feed->msgs feeds)) |
123 | (λ (a b) [< (msg-tm_epoch a) (msg-tm_epoch b)]))) | |
4764ff89 SK |
124 | |
125 | (define (we-are-twtxt) | |
126 | (let* ([uri | |
127 | "https://raw.githubusercontent.com/mdom/we-are-twtxt/master/we-are-twtxt.txt"] | |
128 | [payload | |
129 | (uri-fetch uri)] | |
130 | [lines | |
131 | (str->lines payload)] | |
132 | [feeds | |
133 | (map (λ (line) | |
9e09e799 | 134 | ; TODO validation |
4764ff89 SK |
135 | (define toks (string-split line)) |
136 | (feed | |
137 | [list-ref toks 0] | |
138 | [list-ref toks 1])) | |
139 | lines)]) | |
140 | feeds)) | |
141 | ||
e96264cc | 142 | (define (setup-logging) |
4764ff89 SK |
143 | (define logger (make-logger #f #f 'debug #f)) |
144 | (define log-chan (make-log-receiver logger 'debug)) | |
145 | (void (thread (λ () | |
146 | [date-display-format 'iso-8601] | |
147 | [let loop () | |
148 | (define data (sync log-chan)) | |
149 | (define level (vector-ref data 0)) | |
150 | (define msg (vector-ref data 1)) | |
151 | (define ts (date->string (current-date) #t)) | |
152 | (eprintf "~a [~a] ~a~n" ts level msg) | |
153 | (loop)]))) | |
154 | (current-logger logger)) | |
155 | ||
156 | (define (main) | |
e96264cc | 157 | (setup-logging) |
4764ff89 | 158 | (current-http-response-auto #f) |
8e475eb8 | 159 | (current-http-user-agent "xandkar/tt 0.0.0") |
4764ff89 | 160 | (date-display-format 'rfc2822) |
e96264cc SK |
161 | |
162 | (define feeds (we-are-twtxt)) | |
4764ff89 SK |
163 | (timeline-print (timeline feeds))) |
164 | ||
165 | (main) |