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ob-tangle: Add flag to optionally remove files before writing 

* lisp/ob-tangle.el: Add new custom option
`org-babel-tangle-remove-file-before-write'.
(org-babel-tangle): Remove file before writing according to the value
of `org-babel-tangle-remove-file-before-write'.

The variable `org-babel-tangle-remove-file-before-write' adds support
for the current and old behaviour of `org-babel-tangle'.

Link: https://list.orgmode.org/orgmode/877cjzhjtg.fsf@liolin.ch/
Co-authored-by: Ihor Radchenko <yantar92@posteo.net>

TINYCHANGE
This commit is contained in:
Olivier Lischer 2024-01-23 21:02:20 +01:00 committed by Ihor Radchenko
parent 9029470eb9
commit dd4d05a159
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GPG Key ID: 6470762A7DA11D8B
2 changed files with 40 additions and 1 deletions
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10
etc/ORG-NEWS
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@ -928,6 +928,16 @@ properties, links to headlines in the file can also be made more
robust by using the file id instead of the file path.
** New features
*** =ob-tangle.el=: New flag to remove tangle targets before writing
When ~org-babel-tangle-remove-file-before-write~ is set to ~t~ the
tangle target is removed before writing. This will allow overwriting
read-only tangle targets. However, when tangle target is a symlink,
this will convert the tangle target into an ordinary file.
The default value is ~auto~ -- overwrite tangle targets when they are
read-only.
*** ~org-bibtex-yank~ accepts a prefix argument
When called with a prefix argument, ~org-bibtex-yank~ adds data to the

31
lisp/ob-tangle.el
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@ -166,6 +166,23 @@ read-write permissions for the user, read-only for everyone else."
:package-version '(Org . "9.6")
:type 'integer)
(defcustom org-babel-tangle-remove-file-before-write 'auto
"How to overwrite the existing tangle target.
When set to nil, `org-babel-tangle' will replace contents of an existing
tangle target (and fail when tangle target is read-only).
When set to t, the tangle target (including read-only) will be deleted
first and a new file, possibly with different ownership and
permissions, will be created.
When set to symbol `auto', overwrite read-only tangle targets and
replace contents otherwise."
:group 'org-babel-tangle
:package-version '(Org . "9.7")
:type '(choice
(const :tag "Replace contents, but keep the same file" nil)
(const :tag "Re-create file" t)
(const :tag "Re-create when read-only" auto))
:safe t)
(defun org-babel-find-file-noselect-refresh (file)
"Find file ensuring that the latest changes on disk are
represented in the file."
@ -323,7 +340,19 @@ matching a regular expression."
(error "Not allowed to tangle into the same file as self"))
;; We do not erase, but overwrite previous file
;; to preserve any existing symlinks.
(write-region nil nil file-name)
;; This behavior is modified using
;; `org-babel-tangle-remove-file-before-write' to
;; tangle to read-only files.
(when (and
(file-exists-p file-name)
(pcase org-babel-tangle-remove-file-before-write
(`auto (not (file-writable-p file-name)))
(`t t)
(`nil nil)
(_ (error "Invalid value of `org-babel-tangle-remove-file-before-write': %S"
org-babel-tangle-remove-file-before-write))))
(delete-file file-name))
(write-region nil nil file-name)
(mapc (lambda (mode) (set-file-modes file-name mode)) modes))
(push file-name path-collector))))))
(if (equal arg '(4))