[elpa] externals/tempel 3aa1a7fca8 01/82: Initial commit

[ELPA Syncer]

branch: externals/tempel
commit 3aa1a7fca83b889b8ba326ed0d7ed79e101c2fc2
Author: Daniel Mendler <mail@daniel-mendler.de>
Commit: Daniel Mendler <mail@daniel-mendler.de>

    Initial commit
---
 LICENSE    | 674 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 README.org | 132 ++++++++++++
 tempel.el  | 179 ++++++++++++++++
 3 files changed, 985 insertions(+)

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000..94a9ed024d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
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+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README.org b/README.org
new file mode 100644
index 0000000000..4862790dbf
--- /dev/null
+++ b/README.org
@@ -0,0 +1,132 @@
+#+title: TempEl - Simple templates for Emacs
+#+author: Daniel Mendler
+#+language: en
+
+#+html: <a href="https://www.gnu.org/software/emacs/";><img alt="GNU Emacs" 
src="https://github.com/minad/corfu/blob/screenshots/emacs.svg?raw=true"/></a>
+#+html: <a href="https://melpa.org/#/tempel";><img alt="MELPA" 
src="https://melpa.org/packages/tempel-badge.svg"/></a>
+#+html: <a href="https://stable.melpa.org/#/tempel";><img alt="MELPA Stable" 
src="https://stable.melpa.org/packages/tempel-badge.svg"/></a>
+#+html: <img 
src="https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/Temple_of_Hephaestus_%28Southwest%29%2C_Athens_-_20070711b.jpg/1920px-Temple_of_Hephaestus_%28Southwest%29%2C_Athens_-_20070711b.jpg";
 align="right" width="30%">
+
+* Introduction
+
+Tempel is a tiny template package for Emacs, which uses the builtin Tempo Emacs
+library for expansion. Tempo is an ancient temple. It is 27 years old, but 
still
+in good shape since it successfully resisted change over the decades. Tempel
+provides a modernized UI on top of Tempo, in the form of two commands:
+
++ ~tempel-expand~: Expand a template at point in the buffer. If called
+  non-interactively the function behaves like a completion-at-point-function
+  (Capf). You may want to use my [[https://github.com/minad/corfu][Corfu]] 
completion at point UI.
++ ~tempel-insert~: Select a template by name and insert it into the current 
buffer.
+
+After inserting a template you can move between the template markers with keys
+~M-up/down~ as defined in the ~tempel-map~ keymap.
+
+Note that this package is not a competitor to the mature and widely used
+YASnippet library. Try Tempel only if your snippet and templating requirements
+are limited and if you like tiny and simple packages.
+
+* Quick start
+
+As of 2022-01-05 the package is not yet available in a package repository
+and has to be installed manually with ~package-install-file~.
+
+#+begin_src emacs-lisp
+  ;; Bind the Tempel commands
+  (use-package tempel
+    :bind (("M-+" . tempel-expand)
+           ("M-*" . tempel-insert)))
+
+  ;; Optional: Use the Corfu completion UI
+  (use-package corfu
+    :init
+    (corfu-global-mode))
+#+end_src
+
+* Template file format
+
+The template file format is a lisp file =templates= which is stored by default 
in
+the ~user-emacs-directory~ (=~/.config/emacs/templates=). The templates are 
defined
+as lisp expressions in the concise form of the Emacs Tempo package. The first
+element of the list is the name of the template. After the name the Tempo
+elements follow.
+
+#+begin_src emacs-lisp
+;; -*- mode: lisp -*-
+
+latex-mode
+
+(begin "\\begin{" (P "Environment: " env) "}" > n> r> "\\end{" (s env) "}" > n)
+(enumerate "\\begin{enumerate}\n\\item " r> n> "\\end{enumerate}" > n)
+(itemize "\\begin{itemize}\n\\item " r> n> "\\end{itemize}" > n)
+
+emacs-lisp-mode
+
+(lambda "(lambda (" p ")" n> r> ")")
+(var "(defvar " p "\n  \"" p "\")" n n)
+(const "(defconst " p "\n  \"" p "\")" n n)
+(custom "(defcustom " p "\n  \"" p "\"" n> ":type '" p ")" n n)
+(face "(defface " p " '((t :inherit font-lock-" p "-face))\n  \"" p "\")" n n)
+(group "(defgroup " p " nil\n  \"" p "\"" n> ":group '" p n> ":prefix \"" p 
"-\")" n n)
+(macro "(defmacro " p " (" p ")\n  \"" p "\"" n> r> ")" n n)
+(fun "(defun " p " (" p ")\n  \"" p "\"" n> r> ")" n n)
+(let "(let (" p ")" n> r> ")")
+(star "(let* (" p ")" n> r> ")")
+(rec "(letrec (" p ")" n> r> ")")
+(command "(defun " p " (" p ")\n  \"" p "\"" n> "(interactive)" n> r> ")" n n)
+
+org-mode
+
+(title "#+title: " p n "#+author: Daniel Mendler" n "#+language: en" n n)
+#+end_src
+
+Take a look at the documentation of ~tempo-define-template~ for the 
documentation
+of the template elements. You can even define your own template elements via
+~tempo-user-elements~.
+
+#+begin_quote
+ - A string: It is sent to the hooks in `tempo-insert-string-functions',
+   and the result is inserted.
+ - The symbol `p': This position is saved in `tempo-marks'.
+ - The symbol `r': If `tempo-insert' is called with ON-REGION non-nil
+   the current region is placed here.  Otherwise it works like `p'.
+ - (p PROMPT <NAME> <NOINSERT>): If `tempo-interactive' is non-nil, the
+   user is prompted in the minibuffer with PROMPT for a string to be
+   inserted.  If the optional parameter NAME is non-nil, the text is
+   saved for later insertion with the `s' tag.  If there already is
+   something saved under NAME that value is used instead and no
+   prompting is made.  If NOINSERT is provided and non-nil, nothing is
+   inserted, but text is still saved when a NAME is provided.  For
+   clarity, the symbol `noinsert' should be used as argument.
+ - (P PROMPT <NAME> <NOINSERT>): Works just like the previous tag, but
+   forces `tempo-interactive' to be true.
+ - (r PROMPT <NAME> <NOINSERT>): Like the previous tag, but if
+   `tempo-interactive' is nil and `tempo-insert' is called with
+   ON-REGION non-nil, the current region is placed here.  This usually
+   happens when you call the template function with a prefix argument.
+ - (s NAME): Inserts text previously read with the (p ..) construct.
+   Finds the insertion saved under NAME and inserts it.  Acts like `p'
+   if tempo-interactive is nil.
+ - `&': If there is only whitespace between the line start and point,
+   nothing happens.  Otherwise a newline is inserted.
+ - `%': If there is only whitespace between point and end of line,
+   nothing happens.  Otherwise a newline is inserted.
+ - `n': Inserts a newline.
+ - `>': The line is indented using `indent-according-to-mode'.  Note
+   that you often should place this item after the text you want on
+   the line.
+ - `r>': Like `r', but it also indents the region.
+ - (r> PROMPT <NAME> <NOINSERT>): Like (r ...), but is also indents
+   the region.
+ - `n>': Inserts a newline and indents line.
+ - `o': Like `%' but leaves the point before the newline.
+ - nil: It is ignored.
+ - Anything else: Each function in `tempo-user-elements' is called
+   with it as argument until one of them returns non-nil, and the
+   result is inserted.  If all of them return nil, it is evaluated and
+   the result is treated as an element to be inserted.  One additional
+   tag is useful for these cases.  If an expression returns a list (l
+   foo bar), the elements after `l' will be inserted according to the
+   usual rules.  This makes it possible to return several elements
+   from one expression."
+#+end_quote
diff --git a/tempel.el b/tempel.el
new file mode 100644
index 0000000000..c69085cf22
--- /dev/null
+++ b/tempel.el
@@ -0,0 +1,179 @@
+;;; tempel.el --- Tempo Templates -*- lexical-binding: t -*-
+
+;; Author: Daniel Mendler
+;; Created: 2022
+;; License: GPL-3.0-or-later
+;; Version: 0.1
+;; Package-Requires: ((emacs "27.1"))
+;; Homepage: https://github.com/minad/tempel
+
+;; This file is not part of GNU Emacs.
+
+;; 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This package provides a modern user interface to the Emacs Tempo
+;; template library. Your templates are stored in the `tempel-file' (by
+;; default the file "templates" in the `user-emacs-directory'). Bind the
+;; commands `tempel-expand' or `tempel-insert' to some keys in your user
+;; configuration. You can jump with the keys M-up/down from field to
+;; field. `tempel-expands' works best with the Corfu completion UI,
+;; while `temple-insert' uses `completing-read' under the hood.
+
+;;; Code:
+
+(require 'tempo)
+(require 'seq)
+(eval-when-compile (require 'subr-x))
+
+(defvar tempel-file (expand-file-name "templates" user-emacs-directory))
+(defvar tempel--templates nil)
+(defvar tempel--modified nil)
+(defvar tempel--current nil)
+(defvar tempel--history nil)
+
+(defvar tempel-map
+  (let ((map (make-sparse-keymap)))
+    (define-key map [M-right] #'tempel-forward-mark)
+    (define-key map [M-left] #'tempel-backward-mark)
+    map)
+  "Keymap to navigate across template markers.")
+
+(defun tempel--load (file)
+  "Load Tempo templates from FILE."
+  (with-temp-buffer
+    (insert "(\n")
+    (insert-file-contents-literally file)
+    (goto-char (point-max))
+    (insert "\n)")
+    (goto-char (point-min))
+    (let ((templates (read (current-buffer))) result)
+      (while (and templates (symbolp (car templates)))
+        (push (cons (car templates) (seq-take-while #'consp (cdr templates))) 
result)
+        (setq templates (seq-drop-while #'consp (cdr templates))))
+      result)))
+
+(defun tempel--annotate (templates sep name)
+  "Annotate template NAME given the list of TEMPLATES and SEP."
+  (when-let* ((name (intern-soft name))
+              (def (cdr (assoc name templates))))
+    (concat
+     sep
+     (truncate-string-to-width
+      (replace-regexp-in-string
+       "_+" #("_" 0 1 (face shadow))
+       (propertize
+        (replace-regexp-in-string
+         "\\s-+" " "
+         (mapconcat (lambda (x)
+                      (pcase x
+                        ((pred stringp) x)
+                        ((or 'n 'n>) " ")
+                        (_ "_")))
+                    def ""))
+        'face 'completions-annotations))
+      20 0 ?\s))))
+
+(defun tempel--insert (templates region name)
+  "Insert template NAME given the list of TEMPLATES and REGION flag."
+  (when-let* ((name (intern-soft name))
+              (template (cdr (assoc name templates))))
+    (setf (alist-get 'tempo-marks minor-mode-overriding-map-alist) tempel-map)
+    (let ((tempel--current template))
+      (setq tempo-marks nil)
+      (tempo-insert-template 'tempel--current region))))
+
+(defun tempel--save ()
+  "Save Tempo file buffer."
+  (when-let (buf (get-file-buffer tempel-file))
+    (with-current-buffer buf
+      (when (and (buffer-modified-p) (y-or-n-p (format "Save file %s? " 
tempel-file)))
+        (save-buffer buf)))))
+
+(defun tempel--templates ()
+  "Return Tempo templates for current mode."
+  (let ((mod (file-attribute-modification-time (file-attributes tempel-file))))
+    (unless (equal tempel--modified mod)
+      (setq tempel--templates (tempel--load tempel-file)
+            tempel--modified mod)))
+  (cdr (seq-find (lambda (x) (derived-mode-p (car x))) tempel--templates)))
+
+(defun tempel-forward-mark ()
+  "Move to next template mark and quit at the end."
+  (interactive)
+  (tempo-forward-mark)
+  (when-let (mark (car (last tempo-marks)))
+    (when (>= (point) mark) (tempel-done))))
+
+(defun tempel-backward-mark ()
+  "Move to previous template mark and quit at the beginning."
+  (interactive)
+  (tempo-backward-mark)
+  (when-let (mark (car tempo-marks))
+    (when (<= (point) mark) (tempel-done))))
+
+(defun tempel-done ()
+  "Template completion is done."
+  (interactive)
+  (dolist (mark tempo-marks) (set-marker mark nil))
+  (setq tempo-marks nil
+        minor-mode-overriding-map-alist
+        (delq (assq-delete-all 'tempo-marks minor-mode-overriding-map-alist)
+              minor-mode-overriding-map-alist)))
+
+;;;###autoload
+(defun tempel-expand (&optional interactive)
+  "Complete Tempo template at point.
+If INTERACTIVE is nil the function acts like a capf."
+  (interactive (list t))
+  (if interactive
+      (let (completion-cycle-threshold
+            (completion-at-point-functions (list #'tempel-expand)))
+        (tempel--save)
+        (or (completion-at-point) (user-error "Tempel: No completions")))
+    (tempel-done)
+    (when-let (templates (tempel--templates))
+      (let ((region (use-region-p)) bounds)
+        (when region
+          (when (< (mark) (point)) (exchange-point-and-mark))
+          (deactivate-mark))
+        (setq bounds
+              (or (and (not region) (bounds-of-thing-at-point 'symbol))
+                  (cons (point) (point))))
+        (list (car bounds)
+              (cdr bounds)
+              templates
+              :exclusive 'no
+              :exit-function (lambda (name _status)
+                               (delete-region (max (point-min) (- (point) 
(length name))) (point))
+                               (tempel--insert templates region name))
+              :annotation-function (apply-partially #'tempel--annotate 
templates " "))))))
+
+;;;###autoload
+(defun tempel-insert ()
+  "Insert Tempo template using `completing-read'."
+  (interactive)
+  (tempel-done)
+  (let* ((templates (or (tempel--templates)
+                        (error "Tempel: No templates for %s" major-mode)))
+         (completion-extra-properties
+          (list :annotation-function
+                (apply-partially #'tempel--annotate templates
+                                 #("  " 1 2 (display (space :align-to (+ left 
20)))))))
+         (name (completing-read "Template: " templates nil t nil 
'tempel--history)))
+    (tempel--insert templates (use-region-p) name)))
+
+(provide 'tempel)
+;;; tempel.el ends here