Full text search a single text file

fts.rb

#!/usr/bin/env ruby
# v2021-12-24.1
require 'sqlite3'

dbf = '/tmp/plan.db'
File.delete(dbf) if File.exists? dbf
db = SQLite3::Database.open dbf
db.results_as_hash = true
db.execute "CREATE VIRTUAL TABLE IF NOT EXISTS plan USING FTS5(contents,tokenize = porter)"
db.execute "INSERT INTO plan (contents) VALUES(?)", File.open(ARGV[0]).read
results = db.query "SELECT  snippet(plan, 0,'[', ']', '...',32) as result FROM plan(?) ORDER BY rank ", ARGV.slice(1,ARGV.length).join(" ")

while r = results.next
  puts r['result']
end

Setup: $ chmod +x fts.rb