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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 | |
93ebe03e SK |
13 | ; TODO parse mentions: |
14 | ; - @<source.nick source.url> | @<source.url> | |
d6a187b7 SK |
15 | ; TODO highlight mentions |
16 | ; TODO filter on mentions | |
17 | ; TODO highlight hashtags | |
18 | ; TODO filter on hashtags | |
e0e0fb20 | 19 | ; TODO hashtags as channels? initial hashtag special? |
d6a187b7 | 20 | ; TODO query language |
78a5f475 | 21 | ; TODO concurrency |
e0e0fb20 SK |
22 | ; TODO console logger colors by level ('error) |
23 | ; TODO file logger ('debug) | |
dbccadf9 SK |
24 | ; TODO commands: |
25 | ; - r | read | |
26 | ; - see timeline ops above | |
27 | ; - w | write | |
93ebe03e | 28 | ; - arg or stdin |
dbccadf9 SK |
29 | ; - nick expand to URI |
30 | ; - q | query | |
31 | ; - see timeline ops above | |
32 | ; - see hashtag and channels above | |
93ebe03e SK |
33 | ; - d | download |
34 | ; - u | upload | |
35 | ; - calls user-configured command to upload user's own feed file to their server | |
84152e25 SK |
36 | ; TODO user-agent format: <client>/<version> (+<source.url>; @<source.nick>) |
37 | ; - requires configurability | |
38 | ; - ref: https://twtxt.readthedocs.io/en/latest/user/discoverability.html | |
d6a187b7 | 39 | |
4764ff89 SK |
40 | #lang racket |
41 | ||
42 | (require racket/date) | |
43 | ||
44 | (require http-client) | |
45 | (require rfc3339-old) | |
46 | ||
47 | (struct msg (tm_epoch tm_rfc3339 nick text)) | |
48 | (struct feed (nick uri)) | |
49 | ||
e96264cc SK |
50 | (define (msg-print odd m) |
51 | (printf "~a \033[1;37m<~a>\033[0m \033[0;~am~a\033[0m~n" | |
52 | (date->string (seconds->date [msg-tm_epoch m]) #t) | |
53 | [msg-nick m] | |
54 | [if odd 36 33] | |
55 | [msg-text m])) | |
56 | ||
57 | (define re-msg-begin | |
58 | ; TODO Zulu offset. Maybe in several formats. Which ones? | |
59 | (pregexp "^[0-9]{4}-[0-9]{2}-[0-9]{2}T[0-9]{2}:[0-9]{2}:[0-9]{2}")) | |
88d50b3e SK |
60 | |
61 | (define (str->msg nick str) | |
62 | (if (not (regexp-match? re-msg-begin str)) | |
63 | (begin | |
64 | (log-debug "Non-msg line from nick:~a, line:~a" nick str) | |
65 | #f) | |
66 | (let ([toks (string-split str (regexp "\t+"))]) | |
67 | (if (not (= 2 (length toks))) | |
68 | (begin | |
69 | (log-warning "Invalid msg line from nick:~a, msg:~a" nick str) | |
70 | #f) | |
71 | (let* | |
72 | ([tm_rfc3339 (list-ref toks 0)] | |
73 | [tok_text (list-ref toks 1)] | |
74 | [t (string->rfc3339-record tm_rfc3339)] | |
75 | ; TODO handle tz offset | |
76 | [tm_epoch (find-seconds [rfc3339-record:second t] | |
77 | [rfc3339-record:minute t] | |
78 | [rfc3339-record:hour t] | |
79 | [rfc3339-record:mday t] | |
80 | [rfc3339-record:month t] | |
81 | [rfc3339-record:year t])]) | |
82 | (msg tm_epoch tm_rfc3339 nick tok_text)))))) | |
83 | ||
e96264cc SK |
84 | (define (str->lines str) |
85 | (string-split str (regexp "[\r\n]+"))) | |
86 | ||
88d50b3e SK |
87 | (define (str->msgs nick str) |
88 | (filter-map (λ (line) (str->msg nick line)) (str->lines str))) | |
4764ff89 SK |
89 | |
90 | (define (uri-fetch uri) | |
91 | (log-info "GET ~a" uri) | |
92 | (define resp (http-get uri)) | |
93 | (define status (http-response-code resp)) | |
94 | (define body (http-response-body resp)) | |
95 | (log-debug "finished GET ~a status:~a body length:~a" | |
96 | uri status (string-length body)) | |
97 | ; TODO Handle redirects | |
98 | (if (= status 200) body (raise status))) | |
99 | ||
4764ff89 SK |
100 | (define (timeline-print timeline) |
101 | (for ([msg timeline] | |
102 | [i (in-naturals)]) | |
103 | (msg-print (odd? i) msg))) | |
104 | ||
9a6a9f9a SK |
105 | (define (feed->msgs feed) |
106 | (log-info "downloading feed nick:~a uri:~a" | |
107 | (feed-nick feed) | |
108 | (feed-uri feed)) | |
109 | (with-handlers | |
110 | ([exn:fail:network? | |
111 | (λ (e) | |
112 | (log-error "network error nick:~a uri:~a exn:~a" | |
113 | (feed-nick feed) | |
114 | (feed-uri feed) | |
115 | e) | |
116 | #f)] | |
117 | [integer? | |
118 | (λ (status) | |
119 | (log-error "http error nick:~a uri:~a status:~a" | |
120 | (feed-nick feed) | |
121 | (feed-uri feed) | |
122 | status) | |
123 | #f)]) | |
124 | (str->msgs [feed-nick feed] [uri-fetch (feed-uri feed)]))) | |
125 | ||
126 | ; TODO timeline contract : time-sorted list of messages | |
4764ff89 | 127 | (define (timeline feeds) |
9a6a9f9a SK |
128 | (sort (append* (filter-map feed->msgs feeds)) |
129 | (λ (a b) [< (msg-tm_epoch a) (msg-tm_epoch b)]))) | |
4764ff89 SK |
130 | |
131 | (define (we-are-twtxt) | |
132 | (let* ([uri | |
133 | "https://raw.githubusercontent.com/mdom/we-are-twtxt/master/we-are-twtxt.txt"] | |
134 | [payload | |
135 | (uri-fetch uri)] | |
136 | [lines | |
137 | (str->lines payload)] | |
138 | [feeds | |
139 | (map (λ (line) | |
9e09e799 | 140 | ; TODO validation |
4764ff89 SK |
141 | (define toks (string-split line)) |
142 | (feed | |
143 | [list-ref toks 0] | |
144 | [list-ref toks 1])) | |
145 | lines)]) | |
146 | feeds)) | |
147 | ||
e96264cc | 148 | (define (setup-logging) |
4764ff89 SK |
149 | (define logger (make-logger #f #f 'debug #f)) |
150 | (define log-chan (make-log-receiver logger 'debug)) | |
151 | (void (thread (λ () | |
152 | [date-display-format 'iso-8601] | |
153 | [let loop () | |
154 | (define data (sync log-chan)) | |
155 | (define level (vector-ref data 0)) | |
156 | (define msg (vector-ref data 1)) | |
157 | (define ts (date->string (current-date) #t)) | |
158 | (eprintf "~a [~a] ~a~n" ts level msg) | |
159 | (loop)]))) | |
160 | (current-logger logger)) | |
161 | ||
162 | (define (main) | |
e96264cc | 163 | (setup-logging) |
4764ff89 | 164 | (current-http-response-auto #f) |
8e475eb8 | 165 | (current-http-user-agent "xandkar/tt 0.0.0") |
4764ff89 | 166 | (date-display-format 'rfc2822) |
e96264cc SK |
167 | |
168 | (define feeds (we-are-twtxt)) | |
4764ff89 SK |
169 | (timeline-print (timeline feeds))) |
170 | ||
171 | (main) |