Is there a way to tell org-mode to load only the first N lines of a long text file? I would like to keep the whole file open to be able to search through it, but have org-mode display on the first N lines of my file, which is where I edit new content.
If you have a structured outline in org-mode, you can set the global file visibility with the #+STARTUP markup, or the visibility of any heading with the VISIBILITY property, see Visibility Cycling for details. The benefit of using the built-in org-mode properties is that it's easy to have a file open up in exactly the state you want.
I have my journal file set up to accomplish something similar what I think you're asking for using these org-mode properties. The "Today" section is opened so I can see everything, but older archives are collapsed.
I'm not sure the title really fits the description?
I think you just want use buffer narrowing, which lets you hide everything outside of the specified region for as long as necessary.
You can manually narrow the buffer by marking the region and typing C-xnn
Widen the display back to the full buffer with C-xnw
I guess you could use an eval Local Variable to automate this to a pre-defined region, if you really wanted to.
There's also narrow-to-defun (C-xnd) and narrow-to-page (C-xnp). If you throw a page break into your org file (C-qC-l), the latter might prove handy.
Related
In TeX-latex-mode under Emacs (26.1) using the reftex minor mode,
When pressing C-c (, the command reftex-label (found in reftex-mode-map, from reftex-ref.el) gives pretty good suggestions of label according to context for sections (with the default value of reftex-insert-label-flags).
When pressing C-c C-s, the command LaTeX-section (found in LaTeX-mode-map, defined in latex.el) offers to enter a label for the section, with no suggestion (other than a prefix based on the level of the section, which is useful but much less than the one based on the title section offered by reftex-label).
How can one configure LaTeX-section to make the same suggestions as reftex-label for sections?
The hook LaTeX-section-hook along with the variable LaTeX-section-label would seem the right candidate for that purpose, but the documentation states that
Some LaTeX packages (such as fancyref) look at the prefix to
generate some text around cross-references automatically. When using
those packages, you should not change this variable.
for one, I assume that reftex is one of such packages, and second, I was expecting to be able to give a function inside a hook, not a list of prefixes, I wonder if I misunderstood what a hook is?
I think that one would "just" need to get LaTeX-section to abstain from offering a label and to call the function reftex-label immediately after each LaTeX-section call, but if it is not LaTeX-section-hook, I do not know which one it could be?
Before starting programming something which could involve stuff as complicated as refactoring both latex.el and reftex-ref.el, I thought I would ask in case I was missing an easier solution!!!
At my new job I'm using Emacs 24 on Windows, and its chief use for me in these particular circumstances is as a file manager.
I'd like to jettison everything from the Dired display except filename, size, and date. This question showed me how to use ls-lisp-verbosity to remove most of the detail that I don't want.
But I haven't found a way to keep from displaying the permissions. I've checked the documentation for ls and for dir, and there doesn't seem to be a flag for "don't show permissions". And so far I haven't found anything in Dired that will omit the permissions. Can this be done?
Your best option is to change the ls switches so that Dired does not list those fields. See M-x man ls for your particular platform, to see what ls switches are available to you.
dired-details.el (and dired-details+.el) are no longer needed if you have Emacs 24.4 (or a pre-release development snapshot). Just use ( to toggle between showing and hiding details.
And in that case you at least have two options to control whether symbolic-link targets or all lines except header and file lines are considered details to hide: dired-hide-details-hide-symlink-targets and
dired-hide-details-hide-information-lines.
If changing ls switches does not help in your case, then you would need to tweak function dired-details-make-current-line-overlay from dired-details.el. The details to be hidden are determined by the first cond clause, which is this (wrapped in ignore-errors):
(dired-move-to-filename t)
That moves point to the beginning of the file name. The next line is this:
(make-overlay (+ 2 bol) (point))
That creates the invisibility overlay from the beginning of the line (bol here) up to the beginning of the file name (point).
If you want something different then you need to get the limits that you want for the overlay. For example, if you want invisibility to start at the file size, then you would search forward with a regexp that finds the beginning of the file size.
You can come up with such a regexp by working from the regexp for dired-move-to-filename-regexp (in library dired.el). It is a very complex regexp that matches everything up to the file name. But you can use it to find the date+time portion, which is either the 7th matching regexp subgroup or the 2nd, depending on whether the date+time is expressed using a locale (western or eastern) or using ISO representation.
You can see how this is handled in the code defining variable diredp-font-lock-keywords-1 of library dired+.el.
But again, the best approach, if it does what you want, is to try to use ls switches to control which fields are listed in the first place. You can easily experiment with switches by using a prefix argument with C-x d - you are prompted for the switches to use.
The slrn newsreader has an attractive interface with different colours for the author, subject and date columns when browsing list of articles in a newsgroup. I am looking for the Emacs font/face variables for these fields in gnus, but have not been able to find them. The gnus manual for faces does not list the available faces and none of the faces list in Emacs (M-x customize-face gnus-... looks relevant. I am using gnus 5.13 in Emacs 23.2.1.
(This question is not related to displaying "faces" (icons/avatars) in Emacs or gnus.)
Solved: See my answer below.
I think they're scattered a bit in the gnus codebase. The faces used in the article buffer are probably in gnus-art.el, etc.
It sounds like your biggest problem is that there are specific faces that you can't find the symbol for. You can always do M-x describe-face to see what is under the cursor to solve that problem.
Also, (face-list) returns a list of all defined faces. You could scan that list looking for things that look like likely candidates for the particular faces you're interested in.
The format string for various elements in gnus can be customized by modifying the appropriate variable. The variable for the summary line is gnus-summary-format-line. I am not using the default value for this variable, but instead am using the value %U%R%z %(%&user-date; %-15,15f %* %B%s%)\n.
As described here, a new face can be applied to any (sub)section of a format line by bracketing the section with %1{ and %}, where the 1 in this example corresponds to gnus-face-1. gnus-face-1 in my installation defaults to "italics", so adding the following to my ~/.emacs file results in the author in the summary line appearing in italics:
(setq gnus-summary-line-format "%U%R%z %(%&user-date; %1{%-15,15f%} %* %B%s%)\n")
I go with M-x list-faces-display (which opens a new buffer with all the currently defined face variables fontified to the color that they're set to, in alphabetic order) when I want to see what faces I need to change to get a mode working.
Then I setq them, using either the format from color-theme or from the new emacs built-in theme format, depending on which version of emacs I'm in.
The Emacs extension markerpen.el (link text) allows you to hightlight arbitrary regions in your buffer. With this extension, the added highlighting is lost once you kill the buffer though. However, it would be nice to be able to highlight arbitrary regions of a file in a "persistent" way -- in the sense that the added hightlighting is not lost after I close the file.
Do you know of any way I could have such a "persistent" highlighting?
Thanks very much.
Try enriched-mode.
Yes, such a feature does exist. And you can add the highlighting in any number of ways, including sweeping the mouse marker pen-style.
http://www.emacswiki.org/emacs/HighLight#PermanentHighlighting
At the moment, no feature like this exists, so you'd need to create an extension to markerpen.el which created a metafile containing highlight points in each file that had them. (I'd suggest creating a metafile for each file)
When setting marks, each time one is added to markerpen-overlays you could update the related metafile.
When you load any file, you could check for the existence of the metafile (or when you invoked the markerpen library)
Then load the metafile and create the marks.
I'm writing a mode which is actually a glorified markdown reader. It's a read-only mode however, and though I'd like to change the faces for bold, italics, and links, I'd love to remove the decorations surrounding those faces. However, when I do so, I lose the fontification. Is there anyway to modify fontified-text to something that no longer matches any of the syntax regexes and still keep the fontification?
Org-mode does this for its link markup. I'm not a mode writer (yet), but Org-mode would be the first place I'd look for code that demonstrates how to do this. Oddly, it doesn't do it for any of its fontification: italic, bold, and underline all retain their markup.
Specifically, the code to hide the link markup is on line 4612 of org.el in version 7.01 of org-mode:
(if org-descriptive-links (add-to-invisibility-spec '(org-link)))
where add-to-invisibility-spec is actually supplied by a built in elisp file subr.el, and allows specific types of markup to be hidden. That would be the approach I would take, especially if the buffer is read-only.