more expressiveness of narrow query

[t9md]

For more powerful way to narrow items on the list.
This is for how query keyword is treated in narrowEditor.

• Settled: Keyword is separated by #white-space.
  • Type of query(regex/simple-keyword) has to be treated per query-word.
• Settled: simple-keyword: Internally filtered by _.escapeRegExp
  • When no special prefix is used as query.
  • Case sensitivity(sensitive/insensitive/smartcase) is handled per query-word.
  • What if I want to search space itself or space contained keyword as simple-keyword?
    • No I can't, but maybe it's OK. Use regex \s.
  • Wild card helper support?
    • When I want to search keyword starting pre- keyword.
    • I can use * as wildcard.
    • e.g. pre-* matches pre-a, pre-abc etc..
    • e.g. pre-*llo*suffix matches pre-hello-worldsuffix etc.
    • Single * matches non-whitespace char(>1 length). abc*e not matches abe.
    • What if I want to search * itself? Doesn't * helper disturbing?
      • Double **.
• Idea: negate-simple-keyword
• Idea: regex: by prefixing query with /, e.g. /abc\w+
  • When I want to search / char as simple-keyword, doubling /
    • So searching /etc/hosts as simple-keyword would be //etc/hosts(yes second / is not necessary).
• Idea: negate-regex: by prefixing query with !/. e.g. !/abc\w+
  • When I want to search !/ char as simple-keyword, doubling //
    • So searching !/etc/hosts as simple-keyword would be !//etc/hosts(yes second / is not necessary).
• Idea: Provide short cut to replace type of keywods?
  • narrow-ui:toggle-negate-query add/remove ! prefix of current-word.
  • narrow-ui:toggle-regex-query add/remove / prefix of current-word.
• Idea: Syntax highlight(by grammar) to help understand meta char or regex/not-regex status by eye.
  • e.g. Single * is highlighted, but ** is not highlighted.

[t9md]

See https://github.com/t9md/atom-narrow/wiki/Query for currently implemented.