Module: Legion::CLI::Chat::WebFetch
- Defined in:
- lib/legion/cli/chat/web_fetch.rb
Defined Under Namespace
Classes: FetchError
Constant Summary collapse
- MAX_BODY =
1 MB
1_048_576- MAX_REDIRECTS =
5- TIMEOUT =
15- CONTEXT_LIMIT =
chars injected into conversation
12_000
Class Method Summary collapse
- .clean_whitespace(text) ⇒ Object
- .convert_blocks!(text) ⇒ Object
- .convert_formatting!(text) ⇒ Object
- .convert_headings!(text) ⇒ Object
- .convert_links!(text) ⇒ Object
- .convert_lists!(text) ⇒ Object
- .fetch(url) ⇒ Object
- .follow_redirects(uri, limit = MAX_REDIRECTS) ⇒ Object
- .html?(content_type) ⇒ Boolean
- .html_to_markdown(html) ⇒ Object
- .parse_uri(url) ⇒ Object
- .strip_invisible!(text) ⇒ Object
- .strip_remaining_tags!(text) ⇒ Object
- .truncate(text, limit) ⇒ Object
Class Method Details
.clean_whitespace(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 138 def clean_whitespace(text) text = text.gsub(' ', ' ') .gsub('&', '&') .gsub('<', '<') .gsub('>', '>') .gsub('"', '"') .gsub(''', "'") text.gsub(/\n{3,}/, "\n\n").gsub(/ +/, ' ').strip end |
.convert_blocks!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 125 def convert_blocks!(text) text.gsub!(%r{<pre[^>]*>(.*?)</pre>}mi, "\n```\n\\1\n```\n") text.gsub!(%r{<blockquote[^>]*>(.*?)</blockquote>}mi, "\n> \\1\n") text.gsub!(/<p[^>]*>/mi, "\n\n") text.gsub!(%r{</p>}mi, "\n") text.gsub!(%r{<br\s*/?>}, "\n") text.gsub!(%r{<hr\s*/?>}, "\n---\n") end |
.convert_formatting!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 119 def convert_formatting!(text) text.gsub!(%r{<(b|strong)[^>]*>(.*?)</\1>}mi, '**\\2**') text.gsub!(%r{<(i|em)[^>]*>(.*?)</\1>}mi, '*\\2*') text.gsub!(%r{<code[^>]*>(.*?)</code>}mi, '`\\1`') end |
.convert_headings!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 103 def convert_headings!(text) (1..6).each do |n| prefix = '#' * n text.gsub!(%r{<h#{n}[^>]*>(.*?)</h#{n}>}mi, "\n#{prefix} \\1\n") end end |
.convert_links!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 110 def convert_links!(text) text.gsub!(%r{<a[^>]*href=["']([^"']*)["'][^>]*>(.*?)</a>}mi, '[\\2](\\1)') end |
.convert_lists!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 114 def convert_lists!(text) text.gsub!(%r{<li[^>]*>(.*?)</li>}mi, "\n- \\1") text.gsub!(%r{</?[ou]l[^>]*>}mi, "\n") end |
.fetch(url) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 20 def fetch(url) uri = parse_uri(url) body, content_type = follow_redirects(uri) text = if html?(content_type) html_to_markdown(body) else body end truncate(text.strip, CONTEXT_LIMIT) end |
.follow_redirects(uri, limit = MAX_REDIRECTS) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 43 def follow_redirects(uri, limit = MAX_REDIRECTS) raise FetchError, 'Too many redirects' if limit.zero? http = Net::HTTP.new(uri.host, uri.port) http.use_ssl = (uri.scheme == 'https') http.open_timeout = TIMEOUT http.read_timeout = TIMEOUT request = Net::HTTP::Get.new(uri.request_uri) request['User-Agent'] = 'LegionIO/1.0 (CLI web fetch)' request['Accept'] = 'text/html, text/plain, application/json' response = http.request(request) case response when Net::HTTPRedirection location = response['location'] new_uri = URI.parse(location) new_uri = URI.join(uri, location) unless new_uri.host follow_redirects(new_uri, limit - 1) when Net::HTTPSuccess body = response.body&.dup&.force_encoding('UTF-8') || '' raise FetchError, "Response too large (#{body.bytesize} bytes)" if body.bytesize > MAX_BODY [body, response['content-type']] else raise FetchError, "HTTP #{response.code}: #{response.}" end rescue SocketError => e raise FetchError, "Connection failed: #{e.}" rescue Net::OpenTimeout, Net::ReadTimeout raise FetchError, "Request timed out (#{TIMEOUT}s)" rescue OpenSSL::SSL::SSLError => e raise FetchError, "SSL error: #{e.}" end |
.html?(content_type) ⇒ Boolean
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# File 'lib/legion/cli/chat/web_fetch.rb', line 79 def html?(content_type) content_type&.include?('text/html') || false end |
.html_to_markdown(html) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 83 def html_to_markdown(html) text = html.dup strip_invisible!(text) convert_headings!(text) convert_links!(text) convert_lists!(text) convert_formatting!(text) convert_blocks!(text) (text) clean_whitespace(text) end |
.parse_uri(url) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 33 def parse_uri(url) url = "https://#{url}" unless url.match?(%r{\Ahttps?://}) uri = URI.parse(url) raise FetchError, "Invalid URL: #{url}" unless uri.is_a?(URI::HTTP) uri rescue URI::InvalidURIError raise FetchError, "Invalid URL: #{url}" end |
.strip_invisible!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 95 def strip_invisible!(text) text.gsub!(%r{<script[^>]*>.*?</script>}mi, '') text.gsub!(%r{<style[^>]*>.*?</style>}mi, '') text.gsub!(%r{<nav[^>]*>.*?</nav>}mi, '') text.gsub!(%r{<footer[^>]*>.*?</footer>}mi, '') text.gsub!(/<!--.*?-->/m, '') end |
.strip_remaining_tags!(text) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 134 def (text) text.gsub!(/<[^>]+>/, '') end |
.truncate(text, limit) ⇒ Object
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# File 'lib/legion/cli/chat/web_fetch.rb', line 148 def truncate(text, limit) return text if text.length <= limit text[0, limit] + "\n\n[... truncated at #{limit} characters]" end |