276 lines
9.8 KiB
EmacsLisp
276 lines
9.8 KiB
EmacsLisp
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;;; core-spacebind.el --- Spacemacs Core File
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;;
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;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
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;;
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;; Author: Eugene "JAremko" Yaremenko <w3techplayground@gmail.com>
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;; URL: https://github.com/syl20bnr/spacemacs
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;;
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;; This file is not part of GNU Emacs.
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;;
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;;; License: GPLv3
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(require 'core-keybindings)
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;; TODO: Make this configurable.
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(define-inline spacemacs/major-mode-prefix ()
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"Get current prefix for major modes."
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"m")
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(define-inline spacemacs/leader-key ()
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"Returns `dotspacemacs-leader-key'"
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dotspacemacs-leader-key)
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(defun spacebind//strip-docstring (binding-form)
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"Remove second element of BINDING-FORM if it is a string."
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(if (stringp (cadr binding-form))
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(cons (car binding-form) (cddr binding-form))
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binding-form))
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(defun spacebind//nosp (str)
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"Remove all white-spaces from STR."
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(replace-regexp-in-string " +" "" str))
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(defun spacemacs/add-key-based-replacements-for-minor-mode
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(mode key-sequence replacement &rest more)
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"Proxy for `which-key-add-key-based-replacements'
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MODE currently ignored.
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FIXME: We should disable replacements when the mode is disabled.
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The function `which-key-add-major-mode-key-based-replacements' might give
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a clue how to do this.
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Also there is discussion about the feature:
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https://github.com/justbur/emacs-which-key/issues/212"
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(apply #'which-key-add-key-based-replacements key-sequence replacement more))
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(cl-defstruct spacemacs--spacebind-state
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"State object for `spacebind' macro implementation.
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CTYPE - current binding type.
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RSEXP - accumulator with the macro output.
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This structure has one interpreter method for each supported CTYPE.
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CTYPE is a type of a currently processed binding."
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ctype rsexp)
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(cl-defgeneric spacemacs//spacebind-dispatch (state binding)
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(:documentation "Based on BINDING type modify STATE using BINDING value."))
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(cl-defmethod spacemacs//spacebind-dispatch ((state spacemacs--spacebind-state)
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(keyword-or-symbol symbol))
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"If KEYWORD is a keyword, set STATE slot ctype(current type) to its value.
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If KEYWORD is a non-keyword symbol (without \":\" prefix in the name), wrap
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its value into a list and re-apply the function to it."
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(if (not (keywordp keyword-or-symbol))
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(spacemacs//spacebind-dispatch state (list keyword-or-symbol))
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(setf (spacemacs--spacebind-state-ctype state) keyword-or-symbol)
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state))
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(cl-defmethod spacemacs//spacebind-dispatch ((state spacemacs--spacebind-state)
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(sexp list))
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"Apply STATE method from ctype slot to SEXP and append output to rsexp slot."
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(cl-callf append (spacemacs--spacebind-state-rsexp state)
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(funcall (spacemacs--spacebind-state-ctype state) state sexp))
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state)
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(cl-defmethod spacemacs//spacebind-dispatch ((state spacemacs--spacebind-state)
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(_ string))
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"Append STR to the RSEXP of STATE. Can be used as a doc-string."
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state)
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(defun spacemacs//spacebind-form-visitor (form path k-fn p-fn)
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"Applies K-FN to FORM if it is a key binding form. Otherwise applies P-FN.
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PATH passed to the applied function.
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NOTE: This function strips all newline characters, replaces successive spaces
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with a singular in string elements of FORM and trims tails of function labels
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delimited by \"|\" character."
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(when-let ((fm (and (stringp (car-safe form))
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(seq-take form 3))))
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(list
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(cl-destructuring-bind
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(key-or-prefix
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leader-label-or-fn-symbol
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leader-label-or-next-form)
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(mapcar (lambda (el)
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(if (stringp el)
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(replace-regexp-in-string "[\n[:space:]]+" " " el)
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el))
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fm)
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(let ((full-key-or-prefix (concat path " " key-or-prefix)))
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(if (symbolp leader-label-or-fn-symbol)
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(funcall k-fn
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full-key-or-prefix
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leader-label-or-fn-symbol
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(replace-regexp-in-string
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"[[:punct:][:space:]]*|.*"
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""
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leader-label-or-next-form))
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(funcall p-fn
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full-key-or-prefix
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leader-label-or-fn-symbol)))))))
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(defun spacemacs//spacebind-form-walker-rec (path k-fn p-fn form)
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"Recursive body of `spacemacs//spacebind-form-walker'."
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(append
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(spacemacs//spacebind-form-visitor form path k-fn p-fn)
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(let* ((is-prefix-form (stringp (cadr form)))
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(cur-path (if is-prefix-form
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(concat path (car form))
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path))
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;; Strip key and label from prefix forms.
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(bindings (if is-prefix-form
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(cddr form)
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form)))
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;; Is it a list of bind forms?
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(when (consp (car-safe bindings))
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(seq-mapcat
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(apply-partially
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'spacemacs//spacebind-form-walker-rec
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cur-path
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k-fn
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p-fn)
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bindings)))))
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(defun spacemacs//spacebind-form-walker (b-forms k-fn p-fn)
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"Part of `spacemacs--spacebind-state' interpreters implementation.
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B-FORMS is a root node of a binding tree without mode (car of the root form).
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K-FN called for each key binding node with 3 arguments: full_key_sequence,
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function_symbol and label_for_leader_menu.
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P-FN called for each prefix binding node with 2 arguments:
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full_key_prefix_sequence and label_for_leader_menu.
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Both K-FN and P-FN should return binding evaluation forms.
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The forms will be concatenated and substituted by `spacebind' macro."
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(spacemacs//spacebind-form-walker-rec "" k-fn p-fn b-forms))
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;; Key bindings - keywords handlers
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(cl-defmethod :print-debug ((_ spacemacs--spacebind-state) form)
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"`message' logging interpreter for debugging."
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(let* ((form (spacebind//strip-docstring form))
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(mode (pop form)))
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(spacemacs//spacebind-form-walker
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form
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(lambda (key-seq fn-symbol label)
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`(message "Key binding visitor args: key-seq: %S fn-symbol: %S label: %S"
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,key-seq ,fn-symbol ,label))
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(lambda (key-prefix label)
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`(message "Prefix binding visitor args: key-prefix: %S label: %S"
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,key-prefix ,label)))))
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(cl-defmethod :global ((_ spacemacs--spacebind-state) form)
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"Interpreter for global binding forms."
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(spacemacs//spacebind-form-walker
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;; Strip optional doc-string.
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(if (char-or-string-p (car form))
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(cdr form)
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form)
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(lambda (key-seq fn-symbol label)
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`(progn
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(which-key-add-key-based-replacements
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(concat (spacemacs/leader-key) " " ,key-seq)
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,label)
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(spacemacs/set-leader-keys ,(spacebind//nosp key-seq) ',fn-symbol)))
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(lambda (key-prefix label)
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`(spacemacs/declare-prefix ,(spacebind//nosp key-prefix) ,label))))
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(cl-defmethod :major ((_ spacemacs--spacebind-state) form)
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"Interpreter for major mode binding forms."
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(let* ((form (spacebind//strip-docstring form))
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(mode (pop form)))
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(spacemacs//spacebind-form-walker
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form
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(lambda (key-seq fn-symbol label)
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`(progn
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(which-key-add-major-mode-key-based-replacements
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',mode
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(string-join
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(list (spacemacs/leader-key)
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(spacemacs/major-mode-prefix)
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,key-seq)
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" ")
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,label)
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(spacemacs/set-leader-keys-for-major-mode
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',mode
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(concat (spacemacs/major-mode-prefix) ,(spacebind//nosp key-seq))
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',fn-symbol)))
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(lambda (key-prefix label)
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`(spacemacs/declare-prefix-for-mode
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',mode
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(concat (spacemacs/major-mode-prefix) ,(spacebind//nosp key-prefix))
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,label)))))
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(cl-defmethod :minor ((_ spacemacs--spacebind-state) form)
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"Interpreter for minor mode binding forms."
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(let* ((form (spacebind//strip-docstring form))
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(mode (pop form)))
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(spacemacs//spacebind-form-walker
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form
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(lambda (key-seq fn-symbol label)
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`(progn
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(spacemacs/add-key-based-replacements-for-minor-mode
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',mode
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(concat (spacemacs/leader-key) " " ,key-seq)
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,label)
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(spacemacs/set-leader-keys-for-minor-mode
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',mode
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,(spacebind//nosp key-seq)
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',fn-symbol)))
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(lambda (key-prefix label)
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`(spacemacs/declare-prefix-for-mode
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',mode
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,(spacebind//nosp key-prefix)
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,label)))))
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(defmacro spacebind (&rest bindings)
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"Bind keys and their prefixes declared via BINDINGS tree like structure.
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BINDINGS format:
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<DELIMITER_KEYWORD>
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<BINDING_FORM>
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<BINDING_FORM>
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...
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<DELIMITER_KEYWORD>
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<BINDING_FORM>
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...
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...
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DELIMITER_KEYWORD - specifies a type of following <BINDING_FORM> (or forms).
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Currently supported types: :major, :minor and :global.
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:major and :minor bindings have this shape:
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(<MODE>
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<OPTIONAL_DOC_STRING>
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<PREFIX_OR_BINDING>
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<PREFIX_OR_BINDING>
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...)
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:global forms have a similar shape:
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(<OPTIONAL_DOC_STRING>
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<PREFIX_OR_BINDING>
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<PREFIX_OR_BINDING>
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...)
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<OPTIONAL_DOC_STRING> is a string that will be used to generate a key-bindings
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section in the corresponding README.org files.
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<PREFIX_OR_BINDING> is a recursive form that can be:
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A prefix form:
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(<PREFIX_KEY> <TEXT> <PREFIX_OR_BINDING>)
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Or a key-binding form:
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(<KEY> <FUNCTION_SYMBOL> <TEXT>)
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<TEXT> is what will be displayed in the menu and used for the documentation
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generation.
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<PREFIX_KEY> and <KEY> are singular keys represented as strings.
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<FUNCTION_SYMBOL> is the function that will be bound to the <KEY>.
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See core-spacebind-utest.el for examples.
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NOTE: This macro also has `use-package' integration via `:spacebind' key
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\(fn <<DELIMITER_KEYWORD> <BINDING_FORMS>...>...)"
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(spacemacs--spacebind-state-rsexp
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(seq-reduce 'spacemacs//spacebind-dispatch
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bindings
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(make-spacemacs--spacebind-state
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:rsexp `(progn)))))
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(provide 'core-spacebind)
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