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;;; helm-match-plugin.el --- Multiple regexp matching methods for helm
;; Copyright (C) 2012 Thierry Volpiatto <>
;; Author: Thierry Volpiatto <>
;; URL:
;; Version: 0.2.1
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <>.
;;; Code:
(require 'helm)
(require 'cl)
;;;; Match-plugin
;; Internal
(defvar helm-mp-default-match-functions nil)
(defvar helm-mp-default-search-functions nil)
(defvar helm-mp-default-search-backward-functions nil)
(defun helm-mp-set-matching-method (var key)
"Default function to set matching methods in helm match plugin."
(set-default var key)
(case (symbol-value var)
(multi1 (setq helm-mp-default-match-functions
'(helm-mp-exact-match helm-mp-1-match)
'(helm-mp-exact-search helm-mp-1-search)
(multi2 (setq helm-mp-default-match-functions
'(helm-mp-exact-match helm-mp-2-match)
'(helm-mp-exact-search helm-mp-2-search)
(multi3 (setq helm-mp-default-match-functions
'(helm-mp-exact-match helm-mp-3-match)
'(helm-mp-exact-search helm-mp-3-search)
(multi3p (setq helm-mp-default-match-functions
'(helm-mp-exact-match helm-mp-3p-match)
'(helm-mp-exact-search helm-mp-3p-search)
(t (error "Unknow value: %s" helm-mp-matching-method))))
(defgroup helm-match-plugin nil
"Helm match plugin."
:group 'helm)
(defcustom helm-mp-matching-method 'multi3
"Matching method for helm match plugin.
You can set here different methods to match candidates in helm.
Here are the possible value of this symbol and their meaning:
- multi1: Respect order, prefix of pattern must match.
- multi2: Same but with partial match.
- multi3: The best, multiple regexp match, allow negation.
- multi3p: Same but prefix must match.
Default is multi3."
:type '(radio :tag "Matching methods for helm"
(const :tag "Multiple regexp 1 ordered with prefix match" multi1)
(const :tag "Multiple regexp 2 ordered with partial match" multi2)
(const :tag "Multiple regexp 3 matching no order, partial, best." multi3)
(const :tag "Multiple regexp 3p matching with prefix match" multi3p))
:set 'helm-mp-set-matching-method
:group 'helm-match-plugin)
(defface helm-match
'((t (:inherit match)))
"Face used to highlight matches."
:group 'helm-match-plugin)
(defcustom helm-mp-highlight-delay 0.7
"Highlight matches with `helm-match' face after this many seconds.
If nil, no highlight. "
:type 'integer
:group 'helm-match-plugin)
(defcustom helm-mp-highlight-threshold 2
"Minimum length of pattern to highlight.
The smaller this value is, the slower highlight is."
:type 'integer
:group 'helm-match-plugin)
(define-minor-mode helm-match-plugin-mode
"Add more flexible regexp matching for helm.
See `helm-mp-matching-method' for the behavior of each method."
:group 'helm-match-plugin
:require 'helm-match-plugin
:global t
(if helm-match-plugin-mode
(add-to-list 'helm-compile-source-functions 'helm-compile-source--match-plugin)
(add-hook 'helm-update-hook 'helm-mp-highlight-match))
(setq helm-compile-source-functions
(delq 'helm-compile-source--match-plugin
(remove-hook 'helm-update-hook 'helm-mp-highlight-match)))
;;; Build regexps
(defvar helm-mp-space-regexp "[\\ ] "
"Regexp to represent space itself in multiple regexp match.")
(defun helm-mp-make-regexps (pattern)
"Split PATTERN if it contain spaces and return resulting list.
If spaces in PATTERN are escaped, don't split at this place.
i.e \"foo bar\"=> (\"foo\" \"bar\")
but \"foo\ bar\"=> (\"foobar\")."
(if (string= pattern "")
(loop for s in (split-string
(replace-regexp-in-string helm-mp-space-regexp
"\000\000" pattern)
" " t)
collect (replace-regexp-in-string "\000\000" " " s))))
(defun helm-mp-1-make-regexp (pattern)
"Replace spaces in PATTERN with \"\.*\"."
(mapconcat 'identity (helm-mp-make-regexps pattern) ".*"))
;;; Exact match.
;; Internal.
(defvar helm-mp-exact-pattern-str nil)
(defvar helm-mp-exact-pattern-real nil)
(defun helm-mp-exact-get-pattern (pattern)
(unless (equal pattern helm-mp-exact-pattern-str)
(setq helm-mp-exact-pattern-str pattern
helm-mp-exact-pattern-real (concat "\n" pattern "\n")))
(defun helm-mp-exact-match (str &optional pattern)
(string= str (or pattern helm-pattern)))
(defun helm-mp-exact-search (pattern &rest ignore)
(and (search-forward (helm-mp-exact-get-pattern pattern) nil t)
(forward-line -1)))
(defun helm-mp-exact-search-backward (pattern &rest ignore)
(and (search-backward (helm-mp-exact-get-pattern pattern) nil t)
(forward-line 1)))
;;; Prefix match
;; Internal
(defvar helm-mp-prefix-pattern-str nil)
(defvar helm-mp-prefix-pattern-real nil)
(defun helm-mp-prefix-get-pattern (pattern)
(unless (equal pattern helm-mp-prefix-pattern-str)
(setq helm-mp-prefix-pattern-str pattern
helm-mp-prefix-pattern-real (concat "\n" pattern)))
(defun helm-mp-prefix-match (str &optional pattern)
(setq pattern (or pattern helm-pattern))
(let ((len (length pattern)))
(and (<= len (length str))
(string= (substring str 0 len) pattern ))))
(defun helm-mp-prefix-search (pattern &rest ignore)
(search-forward (helm-mp-prefix-get-pattern pattern) nil t))
(defun helm-mp-prefix-search-backward (pattern &rest ignore)
(and (search-backward (helm-mp-prefix-get-pattern pattern) nil t)
(forward-line 1)))
;;; Multiple regexp patterns 1 (order is preserved / prefix).
;; Internal
(defvar helm-mp-1-pattern-str nil)
(defvar helm-mp-1-pattern-real nil)
(defun helm-mp-1-get-pattern (pattern)
(unless (equal pattern helm-mp-1-pattern-str)
(setq helm-mp-1-pattern-str pattern
(concat "^" (helm-mp-1-make-regexp pattern))))
(defun* helm-mp-1-match (str &optional (pattern helm-pattern))
(string-match (helm-mp-1-get-pattern pattern) str))
(defun helm-mp-1-search (pattern &rest ignore)
(re-search-forward (helm-mp-1-get-pattern pattern) nil t))
(defun helm-mp-1-search-backward (pattern &rest ignore)
(re-search-backward (helm-mp-1-get-pattern pattern) nil t))
;;; Multiple regexp patterns 2 (order is preserved / partial).
;; Internal
(defvar helm-mp-2-pattern-str nil)
(defvar helm-mp-2-pattern-real nil)
(defun helm-mp-2-get-pattern (pattern)
(unless (equal pattern helm-mp-2-pattern-str)
(setq helm-mp-2-pattern-str pattern
(concat "^.*" (helm-mp-1-make-regexp pattern))))
(defun* helm-mp-2-match (str &optional (pattern helm-pattern))
(string-match (helm-mp-2-get-pattern pattern) str))
(defun helm-mp-2-search (pattern &rest ignore)
(re-search-forward (helm-mp-2-get-pattern pattern) nil t))
(defun helm-mp-2-search-backward (pattern &rest ignore)
(re-search-backward (helm-mp-2-get-pattern pattern) nil t))
;;; Multiple regexp patterns 3 (permutation).
;; Internal
(defvar helm-mp-3-pattern-str nil)
(defvar helm-mp-3-pattern-list nil)
(defun helm-mp-3-get-patterns (pattern)
"Return `helm-mp-3-pattern-list', a list of predicate/regexp cons cells.
e.g ((identity . \"foo\") (identity . \"bar\")).
This is done only if `helm-mp-3-pattern-str' is same as PATTERN."
(unless (equal pattern helm-mp-3-pattern-str)
(setq helm-mp-3-pattern-str pattern
(helm-mp-3-get-patterns-internal pattern)))
(defun helm-mp-3-get-patterns-internal (pattern)
"Return a list of predicate/regexp cons cells.
e.g ((identity . \"foo\") (identity . \"bar\"))."
(unless (string= pattern "")
(loop for pat in (helm-mp-make-regexps pattern)
collect (if (string= "!" (substring pat 0 1))
(cons 'not (substring pat 1))
(cons 'identity pat)))))
(defun helm-mp-3-match (str &optional pattern)
"Check if PATTERN match STR.
When PATTERN contain a space, it is splitted and matching is done
with the several resulting regexps against STR.
e.g \"bar foo\" will match \"foobar\" and \"barfoo\".
Argument PATTERN, a string, is transformed in a list of
cons cell with `helm-mp-3-get-patterns' if it contain a space.
e.g \"foo bar\"=>((identity . \"foo\") (identity . \"bar\")).
Then each predicate of cons cell(s) is called with regexp of same
cons cell against STR (a candidate).
i.e (identity (string-match \"foo\" \"foo bar\")) => t."
(let ((pat (helm-mp-3-get-patterns (or pattern helm-pattern))))
(loop for (predicate . regexp) in pat
always (funcall predicate (string-match regexp str)))))
(defun helm-mp-3-search-base (pattern searchfn1 searchfn2)
"Try to find PATTERN in `helm-buffer' with SEARCHFN1 and SEARCHFN2.
This is the search function for `candidates-in-buffer' enabled sources.
Use the same method as `helm-mp-3-match' except it search in buffer
instead of matching on a string.
i.e (identity (re-search-forward \"foo\" (point-at-eol) t)) => t."
(loop with pat = (if (stringp pattern)
(helm-mp-3-get-patterns pattern)
while (funcall searchfn1 (or (cdar pat) "") nil t)
for bol = (point-at-bol)
for eol = (point-at-eol)
if (loop for (pred . str) in (cdr pat) always
(progn (goto-char bol)
(funcall pred (funcall searchfn2 str eol t))))
do (goto-char eol) and return t
else do (goto-char eol)
finally return nil))
(defun helm-mp-3-search (pattern &rest ignore)
(when (stringp pattern)
(setq pattern (helm-mp-3-get-patterns pattern)))
pattern 're-search-forward 're-search-forward))
(defun helm-mp-3-search-backward (pattern &rest ignore)
(when (stringp pattern)
(setq pattern (helm-mp-3-get-patterns pattern)))
pattern 're-search-backward 're-search-backward))
;;; mp-3p- (multiple regexp pattern 3 with prefix search)
(defun helm-mp-3p-match (str &optional pattern)
"Check if PATTERN match STR.
Same as `helm-mp-3-match' but more strict, matching against prefix also.
e.g \"bar foo\" will match \"barfoo\" but not \"foobar\" contrarily to
(let* ((pat (helm-mp-3-get-patterns (or pattern helm-pattern)))
(first (car pat)))
(and (funcall (car first) (helm-mp-prefix-match str (cdr first)))
(loop for (predicate . regexp) in (cdr pat)
always (funcall predicate (string-match regexp str))))))
(defun helm-mp-3p-search (pattern &rest ignore)
(when (stringp pattern)
(setq pattern (helm-mp-3-get-patterns pattern)))
pattern 'helm-mp-prefix-search 're-search-forward))
(defun helm-mp-3p-search-backward (pattern &rest ignore)
(when (stringp pattern)
(setq pattern (helm-mp-3-get-patterns pattern)))
pattern 'helm-mp-prefix-search-backward 're-search-backward))
;;; source compiler
(defun helm-compile-source--match-plugin (source)
(let* ((searchers (if (assoc 'search-from-end source)
(defmatch (helm-aif (assoc-default 'match source)
(if (listp it) it (list it))))
(defmatch-strict (helm-aif (assoc-default 'match-strict source)
(if (listp it) it (list it))))
(defsearch (helm-aif (assoc-default 'search source)
(if (listp it) it (list it))))
(defsearch-strict (helm-aif (assoc-default 'search-strict source)
(if (listp it) it (list it))))
(matchfns (cond (defmatch-strict)
(append helm-mp-default-match-functions defmatch))
(t helm-mp-default-match-functions)))
(searchfns (cond (defsearch-strict)
(append searchers defsearch))
(t searchers))))
`(,(if (or (assoc 'candidates-in-buffer source)
(equal '(identity) matchfns))
'(match identity) `(match ,@matchfns))
(search ,@searchfns)
;;; Highlight matches.
(defun helm-mp-highlight-match ()
"Highlight matches after `helm-mp-highlight-delay' seconds."
(when (and helm-mp-highlight-delay
(not (string= helm-pattern "")))
(unless (assoc 'nohighlight (helm-get-current-source))
(helm-mp-highlight-match-internal (window-end (helm-window)))
(run-with-idle-timer helm-mp-highlight-delay nil
(with-current-buffer helm-buffer (point-max))))))
(defun helm-mp-highlight-region (start end regexp face)
(goto-char start)
(let ((case-fold-search (helm-set-case-fold-search regexp)) me)
(while (and (setq me (re-search-forward regexp nil t))
(< (point) end)
(< 0 (- (match-end 0) (match-beginning 0))))
(unless (helm-pos-header-line-p)
(put-text-property (match-beginning 0) me 'face face))))))
(defun helm-mp-highlight-match-internal (end)
(when (helm-window)
(set-buffer helm-buffer)
(let ((requote (loop for (pred . re) in
(helm-mp-3-get-patterns helm-pattern)
when (and (eq pred 'identity)
(>= (length re)
collect re into re-list
finally return
(if (and re-list (>= (length re-list) 1))
(mapconcat 'identity re-list "\\|")
(regexp-quote helm-pattern)))))
(when (>= (length requote) helm-mp-highlight-threshold)
(point-min) end requote 'helm-match)))))
;; Enable match-plugin by default.
(helm-match-plugin-mode 1)
(provide 'helm-match-plugin)
;; Local Variables:
;; byte-compile-warnings: (not cl-functions obsolete)
;; coding: utf-8
;; indent-tabs-mode: nil
;; byte-compile-dynamic: t
;; End:
;;; helm-match-plugin.el ends here
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