Document preview API for arbitrary link types
* etc/ORG-NEWS: Mention new commands and options for link preview. * doc/org-manual.org: Add sections on - previewing external links (Images and link previews), and - adding the link preview feature to other link types (Adding Hyperlink preview).
This commit is contained in:
Karthik Chikmagalur
Ihor Radchenko
parent
9cce40c94f
commit
e87ecf88be
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@ -11778,7 +11778,77 @@ buffer, and insert it with the proper formatting like =(ref:label)= at
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the end of the current line. Then the label is stored as a link
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the end of the current line. Then the label is stored as a link
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=(label)=, for retrieval with {{{kbd(C-c C-l)}}}.
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=(label)=, for retrieval with {{{kbd(C-c C-l)}}}.
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** Images
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** Images and link previews
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:PROPERTIES:
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:DESCRIPTION: Preview links in the buffer
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:END:
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Org mode can display previews of hyperlinks (see [[*Hyperlinks]])
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inside Org buffers. By default, only image links[fn::Image links are
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=file:= and =attachment:= links to existing image files; Emacs can
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only display the linked images listed in ~image-types~ variable] can
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be previewed inline, where the images are displayed in place of the
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link path.
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You can customize the previews as described in [[*Adding Hyperlink
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preview]]. Link previews do not have to display images -- any kind of
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display decoration (see [[info:elisp#Overlay Properties]]) can be
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used.
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You can preview the supported link types in the whole buffer, in the
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current section, active region or at point with the following commands:
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- {{{kbd(C-c C-x C-v)}}} (~org-link-preview~) ::
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#+kindex: C-c C-x C-v
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#+findex: org-link-preview
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Create inline previews for external links in the active region, if
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any; the link at point, if there is such; or in the current section
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otherwise. With a prefix argument, clear link previews at point or
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in the current entry. With a double prefix argument, preview all
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links in the buffer. With triple prefix argument, hide previews for
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all links in the buffer.
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By default, only links without descriptions are previewed. You
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can force displaying previews for all supported links (including
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links with descriptions) using a numeric argument of ~1~. This
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will toggle all previews in the active region, the link at point
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or the current section. A numeric prefix argument of ~11~ will
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toggle previews in the whole buffer instead.
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#+vindex: org-startup-with-link-previews
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Org mode can display link previews automatically when opening
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buffers. Either customize ~org-startup-with-link-previews~ or use
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the =#+STARTUP: linkpreviews= keyword to enable previews for that
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specific buffer when opening it. =#+STARTUP: nolinkpreviews= will
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disable previews on startup in the buffer.
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- {{{kbd(C-c C-x C-M-v)}}} (~org-link-preview-refresh~) ::
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#+kindex: C-c C-x C-M-v
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#+findex: org-link-preview-refresh
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Assure inline display of external link previews in the whole buffer
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and refresh them.
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- {{{kbd(M-x org-link-preview-region)}}} ::
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#+findex: org-link-preview-region
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Create inline previews for external links in the active region, or
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the buffer. With a prefix argument, also preview links with a text
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description part.
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- {{{kbd(M-x org-link-preview-clear)}}} ::
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#+findex: org-link-preview-clear
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Clear external link previews in the active region, or the buffer.
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#+vindex: org-cycle-inline-images-display
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Link previews can also be displayed when cycling the folding state.
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When the custom option ~org-cycle-link-previews-display~ is set,
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supported link types under the subtree (including images) will be
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displayed automatically.
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*** Images
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:PROPERTIES:
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:PROPERTIES:
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:DESCRIPTION: Display an image.
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:DESCRIPTION: Display an image.
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:END:
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:END:
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@ -11803,102 +11873,76 @@ make sure that the link is on a line by itself and precede it with
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[[./img/a.jpg]]
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[[./img/a.jpg]]
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#+end_example
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#+end_example
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Such images can be displayed within the buffer with the following
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When link previews are displayed as images, the image size and
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command:
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alignment can be further customized.
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- {{{kbd(C-c C-x C-v)}}} (~org-toggle-inline-images-command~) ::
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#+vindex: org-image-actual-width
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#+vindex: org-image-max-width
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#+cindex: @samp{ORG-IMAGE-ACTUAL-WIDTH}, property
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By default, Org mode displays inline images according to their
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actual width, but no wider than ~fill-column~ characters.
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#+kindex: C-c C-x C-v
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You can customize the displayed image width using
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#+findex: org-toggle-inline-images-command
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~org-image-actual-width~ variable (globally) or
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Toggle the inline display of linked images in current section or at
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=ORG-IMAGE-ACTUAL-WIDTH= property (subtree-level)[fn:: The width can
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point. With a prefix argument, toggle inline images in the whole
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be customized in Emacs >= 24.1, built with ImageMagick support.].
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buffer. With double prefix argument, hide all the images in buffer.
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Their value can be the following:
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- (default) Non-~nil~, use the actual width of images when inlining
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By default, only the image links without description are displayed.
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them. If the actual width is too wide, limit it according to
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You can force displaying all the images using numeric argument to
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~org-image-max-width~.
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toggle all the images in current section (~1~ argument) or the whole
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- When set to a number, use ImageMagick (when available) to set the
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buffer (~11~ argument).
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image's width to this value.
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- When set to a number in a list, try to get the width from any
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#+vindex: org-startup-with-inline-images
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=#+ATTR.*= keyword if it matches a width specification like:
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You can ask for inline images to be displayed at
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startup by configuring the variable
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~org-startup-with-inline-images~[fn:: The variable
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~org-startup-with-inline-images~ can be set within a buffer with the
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=STARTUP= options =inlineimages= and =noinlineimages=.].
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#+vindex: org-image-actual-width
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#+vindex: org-image-max-width
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#+cindex: @samp{ORG-IMAGE-ACTUAL-WIDTH}, property
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By default, Org mode displays inline images according to their
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actual width, but no wider than ~fill-column~ characters.
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You can customize the displayed image width using
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~org-image-actual-width~ variable (globally) or
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=ORG-IMAGE-ACTUAL-WIDTH= property (subtree-level)[fn:: The width can
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be customized in Emacs >= 24.1, built with ImageMagick support.].
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Their value can be the following:
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- (default) Non-~nil~, use the actual width of images when inlining
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them. If the actual width is too wide, limit it according to
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~org-image-max-width~.
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- When set to a number, use ImageMagick (when available) to set the
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image's width to this value.
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- When set to a number in a list, try to get the width from any
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=#+ATTR.*= keyword if it matches a width specification like:
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#+begin_example
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,#+ATTR_HTML: :width 300px
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#+end_example
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and fall back on that number if none is found.
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- When set to ~nil~, try to get the width from an =#+ATTR.*= keyword
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and fall back on the original width or ~org-image-max-width~ if
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none is found.
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~org-image-max-width~ limits the maximum displayed image width, but
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only when the image width is not set explicitly. Possible maximum
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width can be set to:
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- (default) ~fill-column~, limit width to ~fill-column~ number of
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characters.
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- ~window~, limit width to current window width.
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- integer number, limit width to that specified number of pixels.
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- ~nil~, do not limit the width.
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#+vindex: org-image-align
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Org mode can left-align, center or right-align the display of inline
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images. This setting is controlled (globally) by ~org-image-align~.
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Only standalone images are affected, corresponding to links with no
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surrounding text in their paragraph except for whitespace. Its
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value can be the following:
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- (default) The symbol ~left~, which inserts the image where the
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link appears in the buffer.
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- The symbol ~center~, which will preview links centered in the
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Emacs window.
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- The symbol ~right~, which will preview links right-aligned in the
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Emacs window.
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Inline image alignment can be specified for each link using the
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=#+ATTR.*= keyword if it matches an alignment specification like:
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#+begin_example
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#+begin_example
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,#+ATTR_HTML: :align center
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,#+ATTR_HTML: :width 300px
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#+end_example
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#+end_example
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Org will use the alignment specification from any =#+ATTR.*=
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and fall back on that number if none is found.
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keyword, such as =#+ATTR_HTML= or =#+ATTR_LATEX=, but =#+ATTR_ORG=
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- When set to ~nil~, try to get the width from an =#+ATTR.*= keyword
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(if present) will override the others. For instance, this link
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and fall back on the original width or ~org-image-max-width~ if
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#+begin_example
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none is found.
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,#+ATTR_HTML: :align right
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,#+ATTR_ORG: :align center
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[[/path/to/image/file.png]]
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#+end_example
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will be displayed centered in Emacs but exported right-aligned to
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HTML.
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When =#+ATTR_ORG= is not set, inline image alignment is also read
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~org-image-max-width~ limits the maximum displayed image width, but
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from the =:center= attribute supported by some export backends (like
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only when the image width is not set explicitly. Possible maximum
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HTML, LaTeX and Beamer.)
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width can be set to:
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- (default) ~fill-column~, limit width to ~fill-column~ number of
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characters.
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- ~window~, limit width to current window width.
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- integer number, limit width to that specified number of pixels.
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- ~nil~, do not limit the width.
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#+vindex: org-cycle-inline-images-display
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#+vindex: org-image-align
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Inline images can also be displayed when cycling the folding state.
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Org mode can left-align, center or right-align the display of inline
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When custom option ~org-cycle-inline-images-display~ is set, the
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images. This setting is controlled (globally) by ~org-image-align~.
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visible inline images under subtree will be displayed automatically.
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Only standalone images are affected, corresponding to links with no
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surrounding text in their paragraph except for whitespace. Its
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value can be the following:
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- (default) The symbol ~left~, which inserts the image where the
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link appears in the buffer.
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- The symbol ~center~, which will preview links centered in the
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Emacs window.
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- The symbol ~right~, which will preview links right-aligned in the
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Emacs window.
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Inline image alignment can be specified for each link using the
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=#+ATTR.*= keyword if it matches an alignment specification like:
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#+begin_example
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,#+ATTR_HTML: :align center
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#+end_example
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Org will use the alignment specification from any =#+ATTR.*=
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keyword, such as =#+ATTR_HTML= or =#+ATTR_LATEX=, but =#+ATTR_ORG=
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(if present) will override the others. For instance, this link
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#+begin_example
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,#+ATTR_HTML: :align right
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,#+ATTR_ORG: :align center
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[[/path/to/image/file.png]]
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#+end_example
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will be displayed centered in Emacs but exported right-aligned to
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HTML.
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When =#+ATTR_ORG= is not set, inline image alignment is also read from
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the =:center= attribute supported by some export backends (like HTML,
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LaTeX and Beamer.)
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** Captions
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** Captions
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:PROPERTIES:
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:PROPERTIES:
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@ -21837,6 +21881,67 @@ A review of =ol-man.el=:
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topic. It also provides a default description. The function
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topic. It also provides a default description. The function
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~org-insert-link~ can insert it back into an Org buffer later on.
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~org-insert-link~ can insert it back into an Org buffer later on.
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** Adding Hyperlink preview
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:PROPERTIES:
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:DESCRIPTION: Preview behavior for new hyperlink types.
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:END:
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#+cindex: hyperlinks, adding preview behavior
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By default, Org supports previewing external links for links ot type
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=file= and =attachment= that point to image files. (See [[*Images]].)
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Support for previewing other link types inline can be added to Org in
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the following way:
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1. Add a =:preview= link parameter to the link type using
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~org-link-set-parameters~. As an example, here we add previews for
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the =docview= link type.
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#+begin_src emacs-lisp
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(org-link-set-parameters
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"docview" :preview #'org-link-docview-preview)
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#+end_src
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2. The value of the =:preview= parameter must be a function that
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accepts three arguments:
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- an overlay placed from the start to the end of the link,
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- the link path, as a string, and
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- the syntax node for the link.
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It must return a non-nil value to indicate preview success. A
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value of =nil= implies that the preview failed, and the overlay
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placed on the link will be removed.
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In our example, we use the =convert= program (part of the
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=imagemagick= suite of tools) to create the thumbnail that is
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displayed inline.
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#+begin_src emacs-lisp
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(defun org-link-docview-preview (ov path _elem)
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"Preview file at PATH in overlay OV.
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_ELEM is the syntax node of the link element."
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(when (executable-find "convert")
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(let* ((path (expand-file-name (substitute-in-file-name path)))
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(output-file (expand-file-name (concat "org-docview-preview-"
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(substring (sha1 path) 0 10)
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".png")
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temporary-file-directory)))
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;; Create or find preview for path
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(when (or (file-readable-p output-file)
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(= 0 (call-process
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"convert"
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nil (get-buffer-create "*Org Docview Preview Output*") nil
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"-thumbnail" "x320" "-colorspace" "rgb"
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"-background" "white" "-alpha" "remove" "-strip"
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(concat path "[0]") output-file)))
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;; If preview image is available, display it via the overlay
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(overlay-put ov 'display (create-image output-file))))))
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#+end_src
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3. Now previews of docview links for supported document types (PDF,
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djvu) are generated (along with image file previews) when calling
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~org-link-preview~.
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** Adding Export Backends
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** Adding Export Backends
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:PROPERTIES:
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:PROPERTIES:
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:DESCRIPTION: How to write new export backends.
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:DESCRIPTION: How to write new export backends.
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93
etc/ORG-NEWS
93
etc/ORG-NEWS
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@ -24,26 +24,38 @@ Previously, =C-c C-x C-v= always toggled image display in the whole
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buffer (or narrowed part of the buffer). With prefix argument, it
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buffer (or narrowed part of the buffer). With prefix argument, it
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also forced displaying image links with description.
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also forced displaying image links with description.
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Now, =C-c C-x C-v= is bound to a new command
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Now, =C-c C-x C-v= is bound to a new command ~org-link-preview~, which
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~org-toggle-inline-images-command~, which uses different defaults:
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uses different defaults:
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1. By default, it toggles image at point or, if there is no image at
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1. When the region is active, images in the region are previewed
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point, images in current entry
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2. When region is active, it is honored
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2. Otherwise, if there is an image at point, it is toggled. If there
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is no image at point, images in the current entry are previewed
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3. =C-u= argument changed its meaning. Now, it forces toggling images
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3. With the =C-u= argument, image previews in the active region or at
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in the whole buffer
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point are cleared instead
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4. =C-u C-u= argument unconditionally hides all the images in buffer
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4. The =C-u C-u= argument unconditionally shows all images in the
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accessible portion of the buffer
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5. Displaying images over links with description can be forced using
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5. The =C-u C-u C-u= argument unconditionally clears all images in the
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accessible portion of the buffer
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6. Displaying images over links with description can be forced using
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numeric argument:
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numeric argument:
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- ~C-u 1~ for toggling all images at point/current entry
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- ~C-u 1~ for toggling all images at point/current entry
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- ~C-u 11~ for toggling all images in buffer
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- ~C-u 11~ for toggling all images in buffer
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The old ~org-toggle-inline-images~ command is still available. You
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(The first five of these prefix arg behaviors are the same as that of
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can bind it back to =C-c C-x C-v= by adding the following to you config:
|
the ~org-latex-preview~ command.)
|
||||||
|
|
||||||
|
In addition to images, ~org-link-preview~ can also be used to preview
|
||||||
|
Org links of all types for which preview behavior is defined, see
|
||||||
|
[[#link-preview][previews for arbitrary link types]].
|
||||||
|
|
||||||
|
The old ~org-toggle-inline-images~ command is obsolete but still
|
||||||
|
available. You can bind it back to =C-c C-x C-v= by adding the
|
||||||
|
following to your config:
|
||||||
#+begin_src emacs-lisp
|
#+begin_src emacs-lisp
|
||||||
(eval-after-load 'org-keys
|
(eval-after-load 'org-keys
|
||||||
(org-defkey org-mode-map (kbd "C-c C-x C-v") #'org-toggle-inline-images))
|
(org-defkey org-mode-map (kbd "C-c C-x C-v") #'org-toggle-inline-images))
|
||||||
|
|
@ -76,6 +88,16 @@ now have diary timestamps included as well.
|
||||||
# We list the most important features, and the features that may
|
# We list the most important features, and the features that may
|
||||||
# require user action to be used.
|
# require user action to be used.
|
||||||
|
|
||||||
|
*** All Org link types can be previewed
|
||||||
|
:PROPERTIES:
|
||||||
|
:CUSTOM_ID: link-preview
|
||||||
|
:END:
|
||||||
|
|
||||||
|
Org links support a new parameter =:preview= that can be used to
|
||||||
|
preview arbitrary link types. The value of this parameter should be a
|
||||||
|
function that is called to preview links of the corresponding type
|
||||||
|
(see ~org-link-parameters~).
|
||||||
|
|
||||||
*** Alignment of image previews can be customized
|
*** Alignment of image previews can be customized
|
||||||
|
|
||||||
This is not a new feature. It has been added in Org 9.7, but not
|
This is not a new feature. It has been added in Org 9.7, but not
|
||||||
|
|
@ -120,6 +142,17 @@ See the new [[info:org#Repeating commands]["Repeating commands"]] section in Org
|
||||||
# adding new customizations, or changing the interpretation of the
|
# adding new customizations, or changing the interpretation of the
|
||||||
# existing customizations.
|
# existing customizations.
|
||||||
|
|
||||||
|
*** New option ~org-link-preview-batch-size~
|
||||||
|
|
||||||
|
Org link previews are generated asynchronously and a few at a time, in
|
||||||
|
batches. This option controls the number of links that are previewed
|
||||||
|
in each batch.
|
||||||
|
|
||||||
|
*** New option ~org-link-preview-delay~
|
||||||
|
|
||||||
|
Org link previews are generated asynchronously. This option controls
|
||||||
|
the minimum idle time in seconds between previews of batches of links.
|
||||||
|
|
||||||
*** Allow disabling macro replacement during export
|
*** Allow disabling macro replacement during export
|
||||||
|
|
||||||
New custom option ~org-export-replace-macros~ controls whether Org
|
New custom option ~org-export-replace-macros~ controls whether Org
|
||||||
|
|
@ -162,6 +195,26 @@ bibliography format requires them to be written in title-case.
|
||||||
|
|
||||||
# This also includes changes in function behavior from Elisp perspective.
|
# This also includes changes in function behavior from Elisp perspective.
|
||||||
|
|
||||||
|
*** New command ~org-link-preview~ to preview Org links
|
||||||
|
|
||||||
|
This command replaces ~org-toggle-inline-images~, which is now
|
||||||
|
obsolete.
|
||||||
|
|
||||||
|
*** New command ~org-link-preview-region~ to preview Org links in a region or the buffer
|
||||||
|
|
||||||
|
This command replaces ~org-display-inline-images~, which is now
|
||||||
|
obsolete.
|
||||||
|
|
||||||
|
*** New command ~org-link-preview-clear~ to clear Org link previews in a region or the buffer
|
||||||
|
|
||||||
|
This command replaces ~org-remove-inline-images~, which is now
|
||||||
|
obsolete.
|
||||||
|
|
||||||
|
*** New command ~org-link-preview-refresh~ to refresh Org link previews in the buffer
|
||||||
|
|
||||||
|
This command replaces ~org-redisplay-inline-images~, which is now
|
||||||
|
obsolete.
|
||||||
|
|
||||||
*** ob-sqlite: Added ability to open a database in readonly mode
|
*** ob-sqlite: Added ability to open a database in readonly mode
|
||||||
|
|
||||||
Added option :readonly to ob-sqlite.
|
Added option :readonly to ob-sqlite.
|
||||||
|
|
@ -204,6 +257,24 @@ leave extra prompts after evaluation, and skipping the prompt
|
||||||
filtering can be more robust for such languages (as this avoids
|
filtering can be more robust for such languages (as this avoids
|
||||||
removing false positive prompts).
|
removing false positive prompts).
|
||||||
|
|
||||||
|
** Removed or renamed functions and variables
|
||||||
|
|
||||||
|
*** ~org-cycle-display-inline-images~ is renamed to ~org-cycle-display-link-previews~
|
||||||
|
|
||||||
|
Inline image previews in Org mode are now provided by the more general
|
||||||
|
link previews feature. The behavior with regards to image links is
|
||||||
|
unchanged.
|
||||||
|
|
||||||
|
*** ~org-cycle-inline-images-display~ is renamed to ~org-cycle-link-previews-display~
|
||||||
|
|
||||||
|
The behavior is unchanged, except in that the new variable now affects
|
||||||
|
previews of supported link types besides image links.
|
||||||
|
|
||||||
|
*** ~org-startup-with-inline-images~ is renamed to ~org-startup-with-link-previews~
|
||||||
|
|
||||||
|
The behavior is unchanged, except in that the new variable now affects
|
||||||
|
previews of supported link types besides image links.
|
||||||
|
|
||||||
** Miscellaneous
|
** Miscellaneous
|
||||||
*** Org mode no longer prevents =flyspell= from spell-checking inside =LOGBOOK= drawers
|
*** Org mode no longer prevents =flyspell= from spell-checking inside =LOGBOOK= drawers
|
||||||
|
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue