1. completion_proc
no6v (Nobuhiro IMAI)
RubyKansai
Sat, 21 Jul 2012

2. require "readline"
line edit (←→)
history (↑↓)
completion (Tab)
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3. line edit
Readline.readline("⚡ ")
⚡ ←→
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4. history
Readline.readline("⚡ ", true)
⚡ Readline::HISTORY.clear
⚡ Readline::HISTORY << "a"
⚡ Readline::HISTORY << "b"
⚡ ↑↓
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5. completion
Readline.completion_proc
Readline.completion_proc =
->(word){%w[word1 word2 ...]}
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6. demo
demo

7. memo of demo
github.com/jugyo/earthquake
github.com/no6v/
rubykansai55/blob/master/
completion_proc.rb
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8. fat man in readline
puts Readline.
methods(false).
grep(->m{/[=?]$/!~m}).
sort_by(&:size).
reverse
# refs hp12c http://bit.ly/QnKcDS
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9. GJ! Thanks!! http://bit.ly/QnFG8r
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10. break
break

11. Array-like object
Readline::HISTORY.class # => Object
Readline::HISTORY.singleton_methods(false) # =>
[:to_s, :[], :[]=, :<<, :push, :pop,
:shift, :each, :length, :size, :empty?,
:delete_at, :clear]
Enumerable === Readline::HISTORY # => true
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12. but, somethings lack...
unshift(*obj)
last
first(n)/last(n)
delete_if{|x| ... }
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13. HISTORY.delete_if
require "readline"
class << Readline::HISTORY
def delete_if(&block)
return enum_for(__method__) unless block
raise SecurityError if $SAFE == 4
i = 0
while (size > i) do
break unless entry = self[i]
if block.call(entry)
delete_at(i)
else
i += 1
end
end
return self
end
end
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14. hist_delete_if
static VALUE
hist_delete_if(VALUE self)
{
HIST_ENTRY *entry;
int i = 0;
RETURN_ENUMERATOR(self, 0, 0);
rb_secure(4);
while (history_length > i) {
entry = history_get(history_get_offset_func(i));
if (entry == NULL) break;
if (RTEST(rb_yield(rb_locale_str_new_cstr(entry->line))))
rb_remove_history(i);
else
i++;
}
return self;
}
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15. Thanks & Q?
Thanks & Q?