/.emacs.d/lib/clojure-mode/clojure-mode.el

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;;; clojure-mode.el --- Major mode for Clojure code -*- lexical-binding: t; -*-

;; Copyright © 2007-2016 Jeffrey Chu, Lennart Staflin, Phil Hagelberg
;; Copyright © 2013-2016 Bozhidar Batsov, Artur Malabarba
;;
;; Authors: Jeffrey Chu <jochu0@gmail.com>
;;       Lennart Staflin <lenst@lysator.liu.se>
;;       Phil Hagelberg <technomancy@gmail.com>
;;       Bozhidar Batsov <bozhidar@batsov.com>
;;       Artur Malabarba <bruce.connor.am@gmail.com>
;; URL: http://github.com/clojure-emacs/clojure-mode
;; Keywords: languages clojure clojurescript lisp
;; Version: 5.6.0
;; Package-Requires: ((emacs "24.4"))

;; This file is not part of GNU Emacs.

;;; Commentary:

;; Provides font-lock, indentation, navigation and basic refactoring for the
;; Clojure programming language (http://clojure.org).

;; Using clojure-mode with paredit or smartparens is highly recommended.

;; Here are some example configurations:

;;   ;; require or autoload paredit-mode
;;   (add-hook 'clojure-mode-hook #'paredit-mode)

;;   ;; require or autoload smartparens
;;   (add-hook 'clojure-mode-hook #'smartparens-strict-mode)

;; See inf-clojure (http://github.com/clojure-emacs/inf-clojure) for
;; basic interaction with Clojure subprocesses.

;; See CIDER (http://github.com/clojure-emacs/cider) for
;; better interaction with subprocesses via nREPL.

;;; License:

;; 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
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Code:


(eval-when-compile
  (defvar calculate-lisp-indent-last-sexp)
  (defvar font-lock-beg)
  (defvar font-lock-end)
  (defvar paredit-space-for-delimiter-predicates)
  (defvar paredit-version)
  (defvar paredit-mode))

(require 'cl-lib)
(require 'imenu)
(require 'newcomment)
(require 'align)
(require 'subr-x)

(declare-function lisp-fill-paragraph  "lisp-mode" (&optional justify))

(defgroup clojure nil
  "Major mode for editing Clojure code."
  :prefix "clojure-"
  :group 'languages
  :link '(url-link :tag "Github" "https://github.com/clojure-emacs/clojure-mode")
  :link '(emacs-commentary-link :tag "Commentary" "clojure-mode"))

(defconst clojure-mode-version "5.5.2"
  "The current version of `clojure-mode'.")

(defface clojure-keyword-face
  '((t (:inherit font-lock-constant-face)))
  "Face used to font-lock Clojure keywords (:something)."
  :package-version '(clojure-mode . "3.0.0"))

(defface clojure-character-face
  '((t (:inherit font-lock-string-face)))
  "Face used to font-lock Clojure character literals."
  :package-version '(clojure-mode . "3.0.0"))

(defface clojure-interop-method-face
  '((t (:inherit font-lock-preprocessor-face)))
  "Face used to font-lock interop method names (camelCase)."
  :package-version '(clojure-mode . "3.0.0"))

(defcustom clojure-indent-style :always-align
  "Indentation style to use for function forms and macro forms.
There are two cases of interest configured by this variable.

- Case (A) is when at least one function argument is on the same
  line as the function name.
- Case (B) is the opposite (no arguments are on the same line as
  the function name).  Note that the body of macros is not
  affected by this variable, it is always indented by
  `lisp-body-indent' (default 2) spaces.

Note that this variable configures the indentation of function
forms (and function-like macros), it does not affect macros that
already use special indentation rules.

The possible values for this variable are keywords indicating how
to indent function forms.

    `:always-align' - Follow the same rules as `lisp-mode'.  All
    args are vertically aligned with the first arg in case (A),
    and vertically aligned with the function name in case (B).
    For instance:
        (reduce merge
                some-coll)
        (reduce
         merge
         some-coll)

    `:always-indent' - All args are indented like a macro body.
        (reduce merge
          some-coll)
        (reduce
          merge
          some-coll)

    `:align-arguments' - Case (A) is indented like `lisp', and
    case (B) is indented like a macro body.
        (reduce merge
                some-coll)
        (reduce
          merge
          some-coll)"
  :safe #'keywordp
  :type '(choice (const :tag "Same as `lisp-mode'" :always-align)
                 (const :tag "Indent like a macro body" :always-indent)
                 (const :tag "Indent like a macro body unless first arg is on the same line"
                        :align-arguments))
  :package-version '(clojure-mode . "5.2.0"))

(define-obsolete-variable-alias 'clojure-defun-style-default-indent
  'clojure-indent-style "5.2.0")

(defcustom clojure-use-backtracking-indent t
  "When non-nil, enable context sensitive indentation."
  :type 'boolean
  :safe 'booleanp)

(defcustom clojure-max-backtracking 3
  "Maximum amount to backtrack up a list to check for context."
  :type 'integer
  :safe 'integerp)

(defcustom clojure-docstring-fill-column fill-column
  "Value of `fill-column' to use when filling a docstring."
  :type 'integer
  :safe 'integerp)

(defcustom clojure-docstring-fill-prefix-width 2
  "Width of `fill-prefix' when filling a docstring.
The default value conforms with the de facto convention for
Clojure docstrings, aligning the second line with the opening
double quotes on the third column."
  :type 'integer
  :safe 'integerp)

(defcustom clojure-omit-space-between-tag-and-delimiters '(?\[ ?\{)
  "Allowed opening delimiter characters after a reader literal tag.
For example, \[ is allowed in :db/id[:db.part/user]."
  :type '(set (const :tag "[" ?\[)
              (const :tag "{" ?\{)
              (const :tag "(" ?\()
              (const :tag "\"" ?\"))
  :safe (lambda (value)
          (and (listp value)
               (cl-every 'characterp value))))

(defcustom clojure-build-tool-files '("project.clj" "build.boot" "build.gradle")
  "A list of files, which identify a Clojure project's root.
Out-of-the box clojure-mode understands lein, boot and gradle."
  :type '(repeat string)
  :package-version '(clojure-mode . "5.0.0")
  :safe (lambda (value)
          (and (listp value)
               (cl-every 'stringp value))))

(defcustom clojure-refactor-map-prefix (kbd "C-c C-r")
  "Clojure refactor keymap prefix."
  :group 'clojure
  :type 'string
  :package-version '(clojure-mode . "5.6.0"))

(defvar clojure-refactor-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-t") #'clojure-thread)
    (define-key map (kbd "t") #'clojure-thread)
    (define-key map (kbd "C-u") #'clojure-unwind)
    (define-key map (kbd "u") #'clojure-unwind)
    (define-key map (kbd "C-f") #'clojure-thread-first-all)
    (define-key map (kbd "f") #'clojure-thread-first-all)
    (define-key map (kbd "C-l") #'clojure-thread-last-all)
    (define-key map (kbd "l") #'clojure-thread-last-all)
    (define-key map (kbd "C-a") #'clojure-unwind-all)
    (define-key map (kbd "a") #'clojure-unwind-all)
    (define-key map (kbd "C-p") #'clojure-cycle-privacy)
    (define-key map (kbd "p") #'clojure-cycle-privacy)
    (define-key map (kbd "C-(") #'clojure-convert-collection-to-list)
    (define-key map (kbd "(") #'clojure-convert-collection-to-list)
    (define-key map (kbd "C-'") #'clojure-convert-collection-to-quoted-list)
    (define-key map (kbd "'") #'clojure-convert-collection-to-quoted-list)
    (define-key map (kbd "C-{") #'clojure-convert-collection-to-map)
    (define-key map (kbd "{") #'clojure-convert-collection-to-map)
    (define-key map (kbd "C-[") #'clojure-convert-collection-to-vector)
    (define-key map (kbd "[") #'clojure-convert-collection-to-vector)
    (define-key map (kbd "C-#") #'clojure-convert-collection-to-set)
    (define-key map (kbd "#") #'clojure-convert-collection-to-set)
    (define-key map (kbd "C-i") #'clojure-cycle-if)
    (define-key map (kbd "i") #'clojure-cycle-if)
    (define-key map (kbd "n i") #'clojure-insert-ns-form)
    (define-key map (kbd "n h") #'clojure-insert-ns-form-at-point)
    (define-key map (kbd "n u") #'clojure-update-ns)
    (define-key map (kbd "n s") #'clojure-sort-ns)
    (define-key map (kbd "s i") #'clojure-introduce-let)
    (define-key map (kbd "s m") #'clojure-move-to-let)
    (define-key map (kbd "s f") #'clojure-let-forward-slurp-sexp)
    (define-key map (kbd "s b") #'clojure-let-backward-slurp-sexp)
    map)
  "Keymap for Clojure refactoring commands.")
(fset 'clojure-refactor-map clojure-refactor-map)

(defvar clojure-mode-map
  (let ((map (make-sparse-keymap)))
    (define-key map (kbd "C-:") #'clojure-toggle-keyword-string)
    (define-key map (kbd "C-c SPC") #'clojure-align)
    (define-key map clojure-refactor-map-prefix 'clojure-refactor-map)
    (easy-menu-define clojure-mode-menu map "Clojure Mode Menu"
      '("Clojure"
        ["Toggle between string & keyword" clojure-toggle-keyword-string]
        ["Align expression" clojure-align]
        ["Cycle privacy" clojure-cycle-privacy]
        ["Cycle if, if-not" clojure-cycle-if]
        ("ns forms"
         ["Insert ns form at the top" clojure-insert-ns-form]
         ["Insert ns form here" clojure-insert-ns-form-at-point]
         ["Update ns form" clojure-update-ns]
         ["Sort ns form" clojure-sort-ns])
        ("Convert collection"
         ["Convert to list" clojure-convert-collection-to-list]
         ["Convert to quoted list" clojure-convert-collection-to-quoted-list]
         ["Convert to map" clojure-convert-collection-to-map]
         ["Convert to vector" clojure-convert-collection-to-vector]
         ["Convert to set" clojure-convert-collection-to-set])
        ("Refactor -> and ->>"
         ["Thread once more" clojure-thread]
         ["Fully thread a form with ->" clojure-thread-first-all]
         ["Fully thread a form with ->>" clojure-thread-last-all]
         "--"
         ["Unwind once" clojure-unwind]
         ["Fully unwind a threading macro" clojure-unwind-all])
        ("Let expression"
         ["Introduce let" clojure-introduce-let]
         ["Move to let" clojure-move-to-let]
         ["Forward slurp form into let" clojure-let-forward-slurp-sexp]
         ["Backward slurp form into let" clojure-let-backward-slurp-sexp])
        ("Documentation"
         ["View a Clojure guide" clojure-view-guide]
         ["View a Clojure reference section" clojure-view-reference-section]
         ["View the Clojure cheatsheet" clojure-view-cheatsheet]
         ["View the Clojure Grimoire" clojure-view-grimoire]
         ["View the Clojure style guide" clojure-view-style-guide])
        "--"
        ["Report a clojure-mode bug" clojure-mode-report-bug]
        ["Clojure-mode version" clojure-mode-display-version]))
    map)
  "Keymap for Clojure mode.")

(defvar clojure-mode-syntax-table
  (let ((table (copy-syntax-table emacs-lisp-mode-syntax-table)))
    (modify-syntax-entry ?\{ "(}" table)
    (modify-syntax-entry ?\} "){" table)
    (modify-syntax-entry ?\[ "(]" table)
    (modify-syntax-entry ?\] ")[" table)
    (modify-syntax-entry ?? "_ p" table) ; ? is a prefix outside symbols
    (modify-syntax-entry ?# "_ p" table) ; # is allowed inside keywords (#399)
    (modify-syntax-entry ?~ "'" table)
    (modify-syntax-entry ?^ "'" table)
    (modify-syntax-entry ?@ "'" table)
    table)
  "Syntax table for Clojure mode.
Inherits from `emacs-lisp-mode-syntax-table'.")

(defconst clojure--prettify-symbols-alist
  '(("fn"  . ?λ)))

(defvar-local clojure-expected-ns-function nil
  "The function used to determine the expected namespace of a file.
`clojure-mode' ships a basic function named `clojure-expected-ns'
that does basic heuristics to figure this out.
CIDER provides a more complex version which does classpath analysis.")

(defun clojure-mode-display-version ()
  "Display the current `clojure-mode-version' in the minibuffer."
  (interactive)
  (message "clojure-mode (version %s)" clojure-mode-version))

(defconst clojure-mode-report-bug-url "https://github.com/clojure-emacs/clojure-mode/issues/new"
  "The URL to report a clojure-mode issue.")

(defun clojure-mode-report-bug ()
  "Report a bug in your default browser."
  (interactive)
  (browse-url clojure-mode-report-bug-url))

(defconst clojure-guides-base-url "https://clojure.org/guides/"
  "The base URL for official Clojure guides.")

(defconst clojure-guides '(("Getting Started" . "getting_started")
                           ("FAQ" . "faq")
                           ("spec" . "spec")
                           ("Destructuring" . "destructuring")
                           ("Threading Macros" . "threading_macros")
                           ("Comparators" . "comparators")
                           ("Reader Conditionals" . "reader_conditionals"))
  "A list of all official Clojure guides.")

(defun clojure-view-guide ()
  "Open a Clojure guide in your default browser.

The command will prompt you to select one of the available guides."
  (interactive)
  (let ((guide (completing-read "Select a guide: " (mapcar #'car clojure-guides))))
    (when guide
      (let ((guide-url (concat clojure-guides-base-url (cdr (assoc guide clojure-guides)))))
        (browse-url guide-url)))))

(defconst clojure-reference-base-url "https://clojure.org/reference/"
  "The base URL for the official Clojure reference.")

(defconst clojure-reference-sections '(("The Reader" . "reader")
                                       ("The REPL and main" . "repl_and_main")
                                       ("Evaluation" . "evaluation")
                                       ("Special Forms" . "special_forms")
                                       ("Macros" . "macros")
                                       ("Other Functions" . "other_functions")
                                       ("Data Structures" . "data_structures")
                                       ("Datatypes" . "datatypes")
                                       ("Sequences" . "sequences")
                                       ("Transients" . "transients")
                                       ("Transducers" . "transducers")
                                       ("Multimethods and Hierarchies" . "multimethods")
                                       ("Protocols" . "protocols")
                                       ("Metadata" . "metadata")
                                       ("Namespaces" . "namespaces")
                                       ("Libs" . "libs")
                                       ("Vars and Environments" . "vars")
                                       ("Refs and Transactions" . "refs")
                                       ("Agents" . "agents")
                                       ("Atoms" . "atoms")
                                       ("Reducers" . "reducers")
                                       ("Java Interop" . "java_interop")
                                       ("Compilation and Class Generation" . "compilation")
                                       ("Other Libraries" . "other_libraries")
                                       ("Differences with Lisps" . "lisps")))

(defun clojure-view-reference-section ()
  "Open a Clojure reference section in your default browser.

The command will prompt you to select one of the available sections."
  (interactive)
  (let ((section (completing-read "Select a reference section: " (mapcar #'car clojure-reference-sections))))
    (when section
      (let ((section-url (concat clojure-reference-base-url (cdr (assoc section clojure-reference-sections)))))
        (browse-url section-url)))))

(defconst clojure-cheatsheet-url "http://clojure.org/api/cheatsheet"
  "The URL of the official Clojure cheatsheet.")

(defun clojure-view-cheatsheet ()
  "Open the Clojure cheatsheet in your default browser."
  (interactive)
  (browse-url clojure-cheatsheet-url))

(defconst clojure-grimoire-url "https://www.conj.io/"
  "The URL of the Grimoire community documentation site.")

(defun clojure-view-grimoire ()
  "Open the Clojure Grimoire in your default browser."
  (interactive)
  (browse-url clojure-grimoire-url))

(defconst clojure-style-guide-url "https://github.com/bbatsov/clojure-style-guide"
  "The URL of the Clojure style guide.")

(defun clojure-view-style-guide ()
  "Open the Clojure style guide in your default browser."
  (interactive)
  (browse-url clojure-style-guide-url))

(defun clojure-space-for-delimiter-p (endp delim)
  "Prevent paredit from inserting useless spaces.
See `paredit-space-for-delimiter-predicates' for the meaning of
ENDP and DELIM."
  (or endp
      (not (memq delim '(?\" ?{ ?\( )))
      (not (or (derived-mode-p 'clojure-mode)
               (derived-mode-p 'cider-repl-mode)))
      (save-excursion
        (backward-char)
        (cond ((eq (char-after) ?#)
               (and (not (bobp))
                    (or (char-equal ?w (char-syntax (char-before)))
                        (char-equal ?_ (char-syntax (char-before))))))
              ((and (eq delim ?\()
                    (eq (char-after) ??)
                    (eq (char-before) ?#))
               nil)
              (t)))))

(defun clojure-no-space-after-tag (endp delimiter)
  "Prevent inserting a space after a reader-literal tag?

When a reader-literal tag is followed be an opening delimiter
listed in `clojure-omit-space-between-tag-and-delimiters', this
function returns t.

This allows you to write things like #db/id[:db.part/user]
without inserting a space between the tag and the opening
bracket.

See `paredit-space-for-delimiter-predicates' for the meaning of
ENDP and DELIMITER."
  (if endp
      t
    (or (not (member delimiter clojure-omit-space-between-tag-and-delimiters))
        (save-excursion
          (let ((orig-point (point)))
            (not (and (re-search-backward
                       "#\\([a-zA-Z0-9._-]+/\\)?[a-zA-Z0-9._-]+"
                       (line-beginning-position)
                       t)
                      (= orig-point (match-end 0)))))))))

(declare-function paredit-open-curly "ext:paredit")
(declare-function paredit-close-curly "ext:paredit")
(declare-function paredit-convolute-sexp "ext:paredit")

(defun clojure--replace-let-bindings-and-indent (orig-fun &rest args)
  "Advise `paredit-convolute-sexp' to replace s-expressions with their bound name if a let form was convoluted."
  (save-excursion
    (backward-sexp)
    (when (looking-back clojure--let-regexp)
      (clojure--replace-sexps-with-bindings-and-indent))))

(defun clojure-paredit-setup (&optional keymap)
  "Make \"paredit-mode\" play nice with `clojure-mode'.

If an optional KEYMAP is passed the changes are applied to it,
instead of to `clojure-mode-map'.
Also advice `paredit-convolute-sexp' when used on a let form as drop in
replacement for `cljr-expand-let`."
  (when (>= paredit-version 21)
    (let ((keymap (or keymap clojure-mode-map)))
      (define-key keymap "{" #'paredit-open-curly)
      (define-key keymap "}" #'paredit-close-curly))
    (add-to-list 'paredit-space-for-delimiter-predicates
                 #'clojure-space-for-delimiter-p)
    (add-to-list 'paredit-space-for-delimiter-predicates
                 #'clojure-no-space-after-tag)
    (advice-add 'paredit-convolute-sexp :after #'clojure--replace-let-bindings-and-indent)))

(defun clojure-mode-variables ()
  "Set up initial buffer-local variables for Clojure mode."
  (add-to-list 'imenu-generic-expression '(nil clojure-match-next-def 0))
  (setq-local indent-tabs-mode nil)
  (setq-local paragraph-ignore-fill-prefix t)
  (setq-local outline-regexp ";;;\\(;* [^ \t\n]\\)\\|(")
  (setq-local outline-level 'lisp-outline-level)
  (setq-local comment-start ";")
  (setq-local comment-start-skip ";+ *")
  (setq-local comment-add 1) ; default to `;;' in comment-region
  (setq-local comment-column 40)
  (setq-local comment-use-syntax t)
  (setq-local multibyte-syntax-as-symbol t)
  (setq-local electric-pair-skip-whitespace 'chomp)
  (setq-local electric-pair-open-newline-between-pairs nil)
  (setq-local fill-paragraph-function #'clojure-fill-paragraph)
  (setq-local adaptive-fill-function #'clojure-adaptive-fill-function)
  (setq-local normal-auto-fill-function #'clojure-auto-fill-function)
  (setq-local comment-start-skip
              "\\(\\(^\\|[^\\\\\n]\\)\\(\\\\\\\\\\)*\\)\\(;+\\|#|\\) *")
  (setq-local indent-line-function #'clojure-indent-line)
  (setq-local indent-region-function #'clojure-indent-region)
  (setq-local lisp-indent-function #'clojure-indent-function)
  (setq-local lisp-doc-string-elt-property 'clojure-doc-string-elt)
  (setq-local clojure-expected-ns-function #'clojure-expected-ns)
  (setq-local parse-sexp-ignore-comments t)
  (setq-local prettify-symbols-alist clojure--prettify-symbols-alist)
  (setq-local open-paren-in-column-0-is-defun-start nil))

;;;###autoload
(define-derived-mode clojure-mode prog-mode "Clojure"
  "Major mode for editing Clojure code.

\\{clojure-mode-map}"
  (clojure-mode-variables)
  (clojure-font-lock-setup)
  (add-hook 'paredit-mode-hook #'clojure-paredit-setup))

(defcustom clojure-verify-major-mode t
  "If non-nil, warn when activating the wrong major-mode."
  :type 'boolean
  :safe #'booleanp
  :package-version '(clojure-mode "5.3.0"))

(defun clojure--check-wrong-major-mode ()
  "Check if the current major-mode matches the file extension.
If it doesn't, issue a warning if `clojure-verify-major-mode' is
non-nil."
  (when (and clojure-verify-major-mode
             (stringp (buffer-file-name)))
    (let* ((case-fold-search t)
           (problem (cond ((and (string-match "\\.clj\\'" (buffer-file-name))
                                (not (eq major-mode 'clojure-mode)))
                           'clojure-mode)
                          ((and (string-match "\\.cljs\\'" (buffer-file-name))
                                (not (eq major-mode 'clojurescript-mode)))
                           'clojurescript-mode)
                          ((and (string-match "\\.cljc\\'" (buffer-file-name))
                                (not (eq major-mode 'clojurec-mode)))
                           'clojurec-mode)
                          ((and (string-match "\\.cljx\\'" (buffer-file-name))
                                (not (eq major-mode 'clojurex-mode)))
                           'clojurex-mode))))
      (when problem
        (message "[WARNING] %s activated `%s' instead of `%s' in this buffer.
This could cause problems.
\(See `clojure-verify-major-mode' to disable this message.)"
                 (if (eq major-mode real-this-command)
                     "You have"
                   "Something in your configuration")
                 major-mode
                 problem)))))

(add-hook 'clojure-mode-hook #'clojure--check-wrong-major-mode)

(defsubst clojure-in-docstring-p ()
  "Check whether point is in a docstring."
  (eq (get-text-property (point) 'face) 'font-lock-doc-face))

(defsubst clojure-docstring-fill-prefix ()
  "The prefix string used by `clojure-fill-paragraph'.

It is simply `clojure-docstring-fill-prefix-width' number of spaces."
  (make-string clojure-docstring-fill-prefix-width ? ))

(defun clojure-adaptive-fill-function ()
  "Clojure adaptive fill function.
This only takes care of filling docstring correctly."
  (when (clojure-in-docstring-p)
    (clojure-docstring-fill-prefix)))

(defun clojure-fill-paragraph (&optional justify)
  "Like `fill-paragraph', but can handle Clojure docstrings.

If JUSTIFY is non-nil, justify as well as fill the paragraph."
  (if (clojure-in-docstring-p)
      (let ((paragraph-start
             (concat paragraph-start
                     "\\|\\s-*\\([(;:\"[]\\|~@\\|`(\\|#'(\\)"))
            (paragraph-separate
             (concat paragraph-separate "\\|\\s-*\".*[,\\.]$"))
            (fill-column (or clojure-docstring-fill-column fill-column))
            (fill-prefix (clojure-docstring-fill-prefix)))
        (fill-paragraph justify))
    (let ((paragraph-start (concat paragraph-start
                                   "\\|\\s-*\\([(;:\"[]\\|`(\\|#'(\\)"))
          (paragraph-separate
           (concat paragraph-separate "\\|\\s-*\".*[,\\.[]$")))
      (or (fill-comment-paragraph justify)
          (fill-paragraph justify))
      ;; Always return `t'
      t)))

(defun clojure-auto-fill-function ()
  "Clojure auto-fill function."
  ;; Check if auto-filling is meaningful.
  (let ((fc (current-fill-column)))
    (when (and fc (> (current-column) fc))
      (let ((fill-column (if (clojure-in-docstring-p)
                             clojure-docstring-fill-column
                           fill-column))
            (fill-prefix (clojure-adaptive-fill-function)))
        (do-auto-fill)))))


;;; #_ comments font-locking
;; Code heavily borrowed from Slime.
;; https://github.com/slime/slime/blob/master/contrib/slime-fontifying-fu.el#L186
(defvar clojure--comment-macro-regexp
  (rx "#_" (* " ") (group-n 1 (not (any " "))))
  "Regexp matching the start of a comment sexp.
The beginning of match-group 1 should be before the sexp to be
marked as a comment.  The end of sexp is found with
`clojure-forward-logical-sexp'.

By default, this only applies to code after the `#_' reader
macro.  In order to also font-lock the `(comment ...)' macro as a
comment, you can set the value to:
    \"#_ *\\\\(?1:[^ ]\\\\)\\\\|\\\\(?1:(comment\\\\_>\\\\)\"")

(defun clojure--search-comment-macro-internal (limit)
  (when (search-forward-regexp clojure--comment-macro-regexp limit t)
    (let* ((md (match-data))
           (start (match-beginning 1))
           (state (syntax-ppss start)))
      ;; inside string or comment?
      (if (or (nth 3 state)
              (nth 4 state))
          (clojure--search-comment-macro-internal limit)
        (goto-char start)
        (clojure-forward-logical-sexp 1)
        ;; Data for (match-end 1).
        (setf (elt md 3) (point))
        (set-match-data md)
        t))))

(defun clojure--search-comment-macro (limit)
  "Find comment macros and set the match data.
Search from point up to LIMIT.  The region that should be
considered a comment is between `(match-beginning 1)'
and `(match-end 1)'."
  (let ((result 'retry))
    (while (and (eq result 'retry) (<= (point) limit))
      (condition-case nil
          (setq result (clojure--search-comment-macro-internal limit))
        (end-of-file (setq result nil))
        (scan-error  (setq result 'retry))))
    result))


;;; General font-locking
(defun clojure-match-next-def ()
  "Scans the buffer backwards for the next \"top-level\" definition.
Called by `imenu--generic-function'."
  ;; we have to take into account namespace-definition forms
  ;; e.g. s/defn
  (when (re-search-backward "^(\\([a-z0-9.-]+/\\)?def\\sw*" nil t)
    (save-excursion
      (let (found?
            (start (point)))
        (down-list)
        (forward-sexp)
        (while (not found?)
          (forward-sexp)
          (or (if (char-equal ?[ (char-after (point)))
                              (backward-sexp))
                  (if (char-equal ?) (char-after (point)))
                (backward-sexp)))
          (cl-destructuring-bind (def-beg . def-end) (bounds-of-thing-at-point 'sexp)
            (if (char-equal ?^ (char-after def-beg))
                (progn (forward-sexp) (backward-sexp))
              (setq found? t)
              (set-match-data (list def-beg def-end)))))
        (goto-char start)))))

(eval-and-compile
  (defconst clojure--sym-forbidden-rest-chars "][\";\'@\\^`~\(\)\{\}\\,\s\t\n\r"
    "A list of chars that a Clojure symbol cannot contain.
See definition of 'macros': URL `http://git.io/vRGLD'.")
  (defconst clojure--sym-forbidden-1st-chars (concat clojure--sym-forbidden-rest-chars "0-9:")
    "A list of chars that a Clojure symbol cannot start with.
See the for-loop: URL `http://git.io/vRGTj' lines: URL
`http://git.io/vRGIh', URL `http://git.io/vRGLE' and value
definition of 'macros': URL `http://git.io/vRGLD'.")
  (defconst clojure--sym-regexp
    (concat "[^" clojure--sym-forbidden-1st-chars "][^" clojure--sym-forbidden-rest-chars "]*")
    "A regexp matching a Clojure symbol or namespace alias.
Matches the rule `clojure--sym-forbidden-1st-chars' followed by
any number of matches of `clojure--sym-forbidden-rest-chars'."))

(defconst clojure-font-lock-keywords
  (eval-when-compile
    `( ;; Top-level variable definition
      (,(concat "(\\(?:clojure.core/\\)?\\("
                (regexp-opt '("def" "defonce"))
                ;; variable declarations
                "\\)\\>"
                ;; Any whitespace
                "[ \r\n\t]*"
                ;; Possibly type or metadata
                "\\(?:#?^\\(?:{[^}]*}\\|\\sw+\\)[ \r\n\t]*\\)*"
                "\\(\\sw+\\)?")
       (1 font-lock-keyword-face)
       (2 font-lock-variable-name-face nil t))
      ;; Type definition
      (,(concat "(\\(?:clojure.core/\\)?\\("
                (regexp-opt '("defstruct" "deftype" "defprotocol"
                              "defrecord"))
                ;; type declarations
                "\\)\\>"
                ;; Any whitespace
                "[ \r\n\t]*"
                ;; Possibly type or metadata
                "\\(?:#?^\\(?:{[^}]*}\\|\\sw+\\)[ \r\n\t]*\\)*"
                "\\(\\sw+\\)?")
       (1 font-lock-keyword-face)
       (2 font-lock-type-face nil t))
      ;; Function definition (anything that starts with def and is not
      ;; listed above)
      (,(concat "(\\(?:" clojure--sym-regexp "/\\)?"
                "\\(def[^ \r\n\t]*\\)"
                ;; Function declarations
                "\\>"
                ;; Any whitespace
                "[ \r\n\t]*"
                ;; Possibly type or metadata
                "\\(?:#?^\\(?:{[^}]*}\\|\\sw+\\)[ \r\n\t]*\\)*"
                "\\(\\sw+\\)?")
       (1 font-lock-keyword-face)
       (2 font-lock-function-name-face nil t))
      ;; (fn name? args ...)
      (,(concat "(\\(?:clojure.core/\\)?\\(fn\\)[ \t]+"
                ;; Possibly type
                "\\(?:#?^\\sw+[ \t]*\\)?"
                ;; Possibly name
                "\\(\\sw+\\)?" )
       (1 font-lock-keyword-face)
       (2 font-lock-function-name-face nil t))
      ;; lambda arguments - %, %&, %1, %2, etc
      ("\\<%[&1-9]?" (0 font-lock-variable-name-face))
      ;; Special forms
      (,(concat
         "("
         (regexp-opt
          '("def" "do" "if" "let" "let*" "var" "fn" "fn*" "loop" "loop*"
            "recur" "throw" "try" "catch" "finally"
            "set!" "new" "."
            "monitor-enter" "monitor-exit" "quote") t)
         "\\>")
       1 font-lock-keyword-face)
      ;; Built-in binding and flow of control forms
      (,(concat
         "(\\(?:clojure.core/\\)?"
         (regexp-opt
          '("letfn" "case" "cond" "cond->" "cond->>" "condp"
            "for" "when" "when-not" "when-let" "when-first" "when-some"
            "if-let" "if-not" "if-some"
            ".." "->" "->>" "as->" "doto" "and" "or"
            "dosync" "doseq" "dotimes" "dorun" "doall"
            "ns" "in-ns"
            "with-open" "with-local-vars" "binding"
            "with-redefs" "with-redefs-fn"
            "declare") t)
         "\\>")
       1 font-lock-keyword-face)
      ;; Macros similar to let, when, and while
      (,(rx symbol-start
            (or "let" "when" "while") "-"
            (1+ (or (syntax word) (syntax symbol)))
            symbol-end)
       0 font-lock-keyword-face)
      (,(concat
         "\\<"
         (regexp-opt
          '("*1" "*2" "*3" "*agent*"
            "*allow-unresolved-vars*" "*assert*" "*clojure-version*"
            "*command-line-args*" "*compile-files*"
            "*compile-path*" "*data-readers*" "*default-data-reader-fn*"
            "*e" "*err*" "*file*" "*flush-on-newline*"
            "*in*" "*macro-meta*" "*math-context*" "*ns*" "*out*"
            "*print-dup*" "*print-length*" "*print-level*"
            "*print-meta*" "*print-readably*"
            "*read-eval*" "*source-path*"
            "*unchecked-math*"
            "*use-context-classloader*" "*warn-on-reflection*")
          t)
         "\\>")
       0 font-lock-builtin-face)
      ;; Dynamic variables - *something* or @*something*
      ("\\(?:\\<\\|/\\)@?\\(\\*[a-z-]*\\*\\)\\>" 1 font-lock-variable-name-face)
      ;; Global constants - nil, true, false
      (,(concat
         "\\<"
         (regexp-opt
          '("true" "false" "nil") t)
         "\\>")
       0 font-lock-constant-face)
      ;; Character literals - \1, \a, \newline, \u0000
      ("\\\\\\([[:punct:]]\\|[a-z0-9]+\\>\\)" 0 'clojure-character-face)
      ;; foo/ Foo/ @Foo/ /FooBar
      (,(concat "\\(?:\\<:?\\|\\.\\)@?\\(" clojure--sym-regexp "\\)\\(/\\)")
       (1 font-lock-type-face) (2 'default))
      ;; Constant values (keywords), including as metadata e.g. ^:static
      ("\\<^?\\(:\\(\\sw\\|\\s_\\)+\\(\\>\\|\\_>\\)\\)" 1 'clojure-keyword-face append)
      ;; Java interop highlighting
      ;; CONST SOME_CONST (optionally prefixed by /)
      ("\\(?:\\<\\|/\\)\\([A-Z]+\\|\\([A-Z]+_[A-Z1-9_]+\\)\\)\\>" 1 font-lock-constant-face)
      ;; .foo .barBaz .qux01 .-flibble .-flibbleWobble
      ("\\<\\.-?[a-z][a-zA-Z0-9]*\\>" 0 'clojure-interop-method-face)
      ;; Foo Bar$Baz Qux_ World_OpenUDP Foo. Babylon15.
      ("\\(?:\\<\\|\\.\\|/\\|#?^\\)\\([A-Z][a-zA-Z0-9_]*[a-zA-Z0-9$_]+\\.?\\>\\)" 1 font-lock-type-face)
      ;; foo.bar.baz
      ("\\<^?\\([a-z][a-z0-9_-]+\\.\\([a-z][a-z0-9_-]*\\.?\\)+\\)" 1 font-lock-type-face)
      ;; (ns namespace) - special handling for single segment namespaces
      (,(concat "(\\<ns\\>[ \r\n\t]*"
                ;; Possibly metadata
                "\\(?:\\^?{[^}]+}[ \r\n\t]*\\)*"
                ;; namespace
                "\\([a-z0-9-]+\\)")
       (1 font-lock-type-face nil t))
      ;; fooBar
      ("\\(?:\\<\\|/\\)\\([a-z]+[A-Z]+[a-zA-Z0-9$]*\\>\\)" 1 'clojure-interop-method-face)
      ;; #_ and (comment ...) macros.
      (clojure--search-comment-macro 1 font-lock-comment-face t)
      ;; Highlight `code` marks, just like `elisp'.
      (,(rx "`" (group-n 1 (optional "#'")
                         (+ (or (syntax symbol) (syntax word)))) "`")
       (1 'font-lock-constant-face prepend))
      ;; Highlight escaped characters in strings.
      (clojure-font-lock-escaped-chars 0 'bold prepend)
      ;; Highlight grouping constructs in regular expressions
      (clojure-font-lock-regexp-groups
       (1 'font-lock-regexp-grouping-construct prepend))))
  "Default expressions to highlight in Clojure mode.")

(defun clojure-font-lock-syntactic-face-function (state)
  "Find and highlight text with a Clojure-friendly syntax table.

This function is passed to `font-lock-syntactic-face-function',
which is called with a single parameter, STATE (which is, in
turn, returned by `parse-partial-sexp' at the beginning of the
highlighted region)."
  (if (nth 3 state)
      ;; This might be a (doc)string or a |...| symbol.
      (let ((startpos (nth 8 state)))
        (if (eq (char-after startpos) ?|)
            ;; This is not a string, but a |...| symbol.
            nil
          (let* ((listbeg (nth 1 state))
                 (firstsym (and listbeg
                                (save-excursion
                                  (goto-char listbeg)
                                  (and (looking-at "([ \t\n]*\\(\\(\\sw\\|\\s_\\)+\\)")
                                       (match-string 1)))))
                 (docelt (and firstsym
                              (function-get (intern-soft firstsym)
                                            lisp-doc-string-elt-property))))
            (if (and docelt
                     ;; It's a string in a form that can have a docstring.
                     ;; Check whether it's in docstring position.
                     (save-excursion
                       (when (functionp docelt)
                         (goto-char (match-end 1))
                         (setq docelt (funcall docelt)))
                       (goto-char listbeg)
                       (forward-char 1)
                       (condition-case nil
                           (while (and (> docelt 0) (< (point) startpos)
                                       (progn (forward-sexp 1) t))
                             ;; ignore metadata and type hints
                             (unless (looking-at "[ \n\t]*\\(\\^[A-Z:].+\\|\\^?{.+\\)")
                               (setq docelt (1- docelt))))
                         (error nil))
                       (and (zerop docelt) (<= (point) startpos)
                            (progn (forward-comment (point-max)) t)
                            (= (point) (nth 8 state)))))
                font-lock-doc-face
              font-lock-string-face))))
    font-lock-comment-face))

(defun clojure-font-lock-setup ()
  "Configures font-lock for editing Clojure code."
  (setq-local font-lock-multiline t)
  (add-to-list 'font-lock-extend-region-functions
               #'clojure-font-lock-extend-region-def t)
  (setq font-lock-defaults
        '(clojure-font-lock-keywords    ; keywords
          nil nil
          (("+-*/.<>=!?$%_&:" . "w")) ; syntax alist
          nil
          (font-lock-mark-block-function . mark-defun)
          (font-lock-syntactic-face-function
           . clojure-font-lock-syntactic-face-function))))

(defun clojure-font-lock-def-at-point (point)
  "Range between the top-most def* and the fourth element after POINT.
Note that this means that there is no guarantee of proper font
locking in def* forms that are not at top level."
  (goto-char point)
  (condition-case nil
      (beginning-of-defun)
    (error nil))

  (let ((beg-def (point)))
    (when (and (not (= point beg-def))
               (looking-at "(def"))
      (condition-case nil
          (progn
            ;; move forward as much as possible until failure (or success)
            (forward-char)
            (dotimes (_ 4)
              (forward-sexp)))
        (error nil))
      (cons beg-def (point)))))

(defun clojure-font-lock-extend-region-def ()
  "Set region boundaries to include the first four elements of def* forms."
  (let ((changed nil))
    (let ((def (clojure-font-lock-def-at-point font-lock-beg)))
      (when def
        (cl-destructuring-bind (def-beg . def-end) def
          (when (and (< def-beg font-lock-beg)
                     (< font-lock-beg def-end))
            (setq font-lock-beg def-beg
                  changed t)))))
    (let ((def (clojure-font-lock-def-at-point font-lock-end)))
      (when def
        (cl-destructuring-bind (def-beg . def-end) def
          (when (and (< def-beg font-lock-end)
                     (< font-lock-end def-end))
            (setq font-lock-end def-end
                  changed t)))))
    changed))

(defun clojure--font-locked-as-string-p (&optional regexp)
  "Non-nil if the char before point is font-locked as a string.
If REGEXP is non-nil, also check whether current string is
preceeded by a #."
  (let ((face (get-text-property (1- (point)) 'face)))
    (and (or (and (listp face)
                  (memq 'font-lock-string-face face))
             (eq 'font-lock-string-face face))
         (or (clojure-string-start t)
             (unless regexp
               (clojure-string-start nil))))))

(defun clojure-font-lock-escaped-chars (bound)
  "Highlight \escaped chars in strings.
BOUND denotes a buffer position to limit the search."
  (let ((found nil))
    (while (and (not found)
                (re-search-forward "\\\\." bound t))

      (setq found (clojure--font-locked-as-string-p)))
    found))

(defun clojure-font-lock-regexp-groups (bound)
  "Highlight grouping constructs in regular expression.

BOUND denotes the maximum number of characters (relative to the
point) to check."
  (let ((found nil))
    (while (and (not found)
                (re-search-forward (eval-when-compile
                                     (concat
                                      ;; A group may start using several alternatives:
                                      "\\(\\(?:"
                                      ;; 1. (? special groups
                                      "(\\?\\(?:"
                                      ;; a) non-capturing group (?:X)
                                      ;; b) independent non-capturing group (?>X)
                                      ;; c) zero-width positive lookahead (?=X)
                                      ;; d) zero-width negative lookahead (?!X)
                                      "[:=!>]\\|"
                                      ;; e) zero-width positive lookbehind (?<=X)
                                      ;; f) zero-width negative lookbehind (?<!X)
                                      "<[=!]\\|"
                                      ;; g) named capturing group (?<name>X)
                                      "<[[:alnum:]]+>"
                                      "\\)\\|" ;; end of special groups
                                      ;; 2. normal capturing groups (
                                      ;; 3. we also highlight alternative
                                      ;; separarators |, and closing parens )
                                      "[|()]"
                                      "\\)\\)"))
                                   bound t))
      (setq found (clojure--font-locked-as-string-p 'regexp)))
    found))

;; Docstring positions
(put 'ns 'clojure-doc-string-elt 2)
(put 'def 'clojure-doc-string-elt 2)
(put 'defn 'clojure-doc-string-elt 2)
(put 'defn- 'clojure-doc-string-elt 2)
(put 'defmulti 'clojure-doc-string-elt 2)
(put 'defmacro 'clojure-doc-string-elt 2)
(put 'definline 'clojure-doc-string-elt 2)
(put 'defprotocol 'clojure-doc-string-elt 2)

;;; Vertical alignment
(defcustom clojure-align-forms-automatically nil
  "If non-nil, vertically align some forms automatically.
Automatically means it is done as part of indenting code.  This
applies to binding forms (`clojure-align-binding-forms'), to cond
forms (`clojure-align-cond-forms') and to map literals.  For
instance, selecting a map a hitting \\<clojure-mode-map>`\\[indent-for-tab-command]'
will align the values like this:
    {:some-key 10
     :key2     20}"
  :package-version '(clojure-mode . "5.1")
  :safe #'booleanp
  :type 'boolean)

(defcustom clojure-align-binding-forms
  '("let" "when-let" "when-some" "if-let" "if-some" "binding" "loop"
    "doseq" "for" "with-open" "with-local-vars" "with-redefs")
  "List of strings matching forms that have binding forms."
  :package-version '(clojure-mode . "5.1")
  :safe #'listp
  :type '(repeat string))

(defcustom clojure-align-cond-forms '("condp" "cond" "cond->" "cond->>" "case" "are")
  "List of strings identifying cond-like forms."
  :package-version '(clojure-mode . "5.1")
  :safe #'listp
  :type '(repeat string))

(defun clojure--position-for-alignment ()
  "Non-nil if the sexp around point should be automatically aligned.
This function expects to be called immediately after an
open-brace or after the function symbol in a function call.

First check if the sexp around point is a map literal, or is a
call to one of the vars listed in `clojure-align-cond-forms'.  If
it isn't, return nil.  If it is, return non-nil and place point
immediately before the forms that should be aligned.

For instance, in a map literal point is left immediately before
the first key; while, in a let-binding, point is left inside the
binding vector and immediately before the first binding
construct."
  ;; Are we in a map?
  (or (and (eq (char-before) ?{)
           (not (eq (char-before (1- (point))) ?\#)))
      ;; Are we in a cond form?
      (let* ((fun    (car (member (thing-at-point 'symbol) clojure-align-cond-forms)))
             (method (and fun (clojure--get-indent-method fun)))
             ;; The number of special arguments in the cond form is
             ;; the number of sexps we skip before aligning.
             (skip   (cond ((numberp method) method)
                           ((null method) 0)
                           ((sequencep method) (elt method 0)))))
        (when (and fun (numberp skip))
          (clojure-forward-logical-sexp skip)
          (comment-forward (point-max))
          fun)) ; Return non-nil (the var name).
      ;; Are we in a let-like form?
      (when (member (thing-at-point 'symbol)
                    clojure-align-binding-forms)
        ;; Position inside the binding vector.
        (clojure-forward-logical-sexp)
        (backward-sexp)
        (when (eq (char-after) ?\[)
          (forward-char 1)
          (comment-forward (point-max))
          ;; Return non-nil.
          t))))

(defun clojure--find-sexp-to-align (end)
  "Non-nil if there's a sexp ahead to be aligned before END.
Place point as in `clojure--position-for-alignment'."
  ;; Look for a relevant sexp.
  (let ((found))
    (while (and (not found)
                (search-forward-regexp
                 (concat "{\\|(" (regexp-opt
                                  (append clojure-align-binding-forms
                                          clojure-align-cond-forms)
                                  'symbols))
                 end 'noerror))

      (let ((ppss (syntax-ppss)))
        ;; If we're in a string or comment.
        (unless (or (elt ppss 3)
                    (elt ppss 4))
          ;; Only stop looking if we successfully position
          ;; the point.
          (setq found (clojure--position-for-alignment)))))
    found))

(defun clojure--search-whitespace-after-next-sexp (&optional bound _noerror)
  "Move point after all whitespace after the next sexp.
Set the match data group 1 to be this region of whitespace and
return point."
  (unwind-protect
      (ignore-errors
        (clojure-forward-logical-sexp 1)
        (search-forward-regexp "\\([,\s\t]*\\)" bound)
        (pcase (syntax-after (point))
          ;; End-of-line, try again on next line.
          (`(12) (clojure--search-whitespace-after-next-sexp bound))
          ;; Closing paren, stop here.
          (`(5 . ,_) nil)
          ;; Anything else is something to align.
          (_ (point))))
    (when (and bound (> (point) bound))
      (goto-char bound))))

(defun clojure-align (beg end)
  "Vertically align the contents of the sexp around point.
If region is active, align it.  Otherwise, align everything in the
current \"top-level\" sexp.
When called from lisp code align everything between BEG and END."
  (interactive (if (use-region-p)
                   (list (region-beginning) (region-end))
                 (save-excursion
                   (let ((end (progn (end-of-defun)
                                     (point))))
                     (clojure-backward-logical-sexp)
                     (list (point) end)))))
  (setq end (copy-marker end))
  (save-excursion
    (goto-char beg)
    (while (clojure--find-sexp-to-align end)
      (let ((sexp-end (save-excursion
                        (backward-up-list)
                        (forward-sexp 1)
                        (point-marker)))
            (clojure-align-forms-automatically nil)
            (count 1))
        ;; For some bizarre reason, we need to `align-region' once for each
        ;; group.
        (save-excursion
          (while (search-forward-regexp "^ *\n" sexp-end 'noerror)
            (cl-incf count)))
        (dotimes (_ count)
          (align-region (point) sexp-end nil
                        '((clojure-align (regexp . clojure--search-whitespace-after-next-sexp)
                                         (group . 1)
                                         (separate . "^ *$")
                                         (repeat . t)))
                        nil))
        ;; Reindent after aligning because of #360.
        (indent-region (point) sexp-end)))))

;;; Indentation
(defun clojure-indent-region (beg end)
  "Like `indent-region', but also maybe align forms.
Forms between BEG and END are aligned according to
`clojure-align-forms-automatically'."
  (prog1 (let ((indent-region-function nil))
           (indent-region beg end))
    (when clojure-align-forms-automatically
      (condition-case nil
          (clojure-align beg end)
        (scan-error nil)))))

(defun clojure-indent-line ()
  "Indent current line as Clojure code."
  (if (clojure-in-docstring-p)
      (save-excursion
        (beginning-of-line)
        (when (and (looking-at "^\\s-*")
                   (<= (string-width (match-string-no-properties 0))
                       (string-width (clojure-docstring-fill-prefix))))
          (replace-match (clojure-docstring-fill-prefix))))
    (lisp-indent-line)))

(defvar clojure-get-indent-function nil
  "Function to get the indent spec of a symbol.
This function should take one argument, the name of the symbol as
a string.  This name will be exactly as it appears in the buffer,
so it might start with a namespace alias.

This function is analogous to the `clojure-indent-function'
symbol property, and its return value should match one of the
allowed values of this property.  See `clojure-indent-function'
for more information.")

(defun clojure--get-indent-method (function-name)
  "Return the indent spec for the symbol named FUNCTION-NAME.
FUNCTION-NAME is a string.  If it contains a `/', also try only
the part after the `/'.

Look for a spec using `clojure-get-indent-function', then try the
`clojure-indent-function' and `clojure-backtracking-indent'
symbol properties."
  (or (when (functionp clojure-get-indent-function)
      …