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Re: Workshop to save M$ Windows users - help needed
From: |
Eduardo Ochs |
Subject: |
Re: Workshop to save M$ Windows users - help needed |
Date: |
Sun, 3 Oct 2021 16:15:11 -0300 |
On Sun, 3 Oct 2021 at 07:41, Eli Zaretskii <eliz@gnu.org> wrote:
>
> Do you really need that? The Windows Explorer can unzip files just
> fine, and a browser or Emacs itself can be used to fetch files.
Hi Eli,
Let me start by showing some kinds of useful one-liners.
1. (find-eev-quick-intro "2. Evaluating Lisp" "M-0 M-e")
(find-eev-quick-intro "3.1. Non-elisp hyperlinks" "M-x brff")
(find-emacs-keys-intro "5. Undoing")
The first sexp above opens the sandboxed tutorial called
`find-eev-quick-intro', searches for the first occurrence of the
string "2. Evaluating Lisp" in it, and then searches for the
first occurrence of the string "M-0 M-e" after that.
2. (find-firefox-page "http://foo/bar/Coetzee99.pdf" 4)
(find-firefox-page "~/Coetzee99.pdf" 4)
The two sexps above use Firefox as a PDF viewer to open a remote
PDF and a local PDF on page 4. In low-level terms what they do is:
(find-bgprocess '("firefox" "http://foo/bar/Coetzee99.pdf#page=4"))
(find-bgprocess '("firefox" "file:///home/edrx/Coetzee99.pdf#page=4"))
3. (find-testblsvideo "2:33" "f8 here starts a new Lua interpreter")
This sexp plays the video about test blocks starting from 2:33.
Let me pretend here that I would have time enough in the workshop
to show that it has two "natural" definitions. Its first natural
definition would use the copy of that video at youtube, and would
use Firefox to open this URL:
http://www.youtube.com/watch?v=fpsF_M55W4o#t=2m33s
Its second natural definition supposes that we have downloaded
the .mp4 file of that video, that is here,
http://angg.twu.net/eev-videos/2021-test-blocks.mp4
to some hardcoded location, like:
/tmp/foo/bar/2021-test-blocks.mp4
and it supposes that everyone in the workshop has the mpv video
player installed. In low-level terms, what this second definition
runs is:
(find-bgprocess '("mpv" "/tmp/foo/bar/2021-test-blocks.mp4"
"--start=2:33" "--fs" "--osd-level=2"))
4. (find-pdf-text "~/Coetzee99.pdf" (+ -110 127) "wrong thoughts")
This is a variant of the sexps in item 2. It is not trivial to
make `find-pdf-text' work on Windows, but that function is a
fixture of my workshops on LaTeX. Let me pretend that I would be
able to present it, just because it is a very nifty function and
it will be good karma to give that function a bit more of
visibility.
That sexp converts the file ~/Coetzee99.pdf to text by running:
pdftotext -layout -enc Latin1 /home/edrx/Coetzee99.pdf -
then puts the output in a temporary buffer, finds the page 17,
i.e., (+ -110 127), in it by counting formfeeds, and searches for
the first occurrence of the string "wrong thoughts" in that
buffer starting from the beginning of page 17.
So, consider again these sexps:
(find-eev-quick-intro "2. Evaluating Lisp" "M-0 M-e")
(find-eev-quick-intro "3.1. Non-elisp hyperlinks" "M-x brff")
(find-emacs-keys-intro "5. Undoing")
(find-firefox-page "http://foo/bar/Coetzee99.pdf" 4)
(find-firefox-page "~/Coetzee99.pdf" 4)
(find-testblsvideo "2:33" "f8 here starts a new Lua interpreter")
(find-pdf-text "~/Coetzee99.pdf" (+ -110 127) "wrong thoughts")
all of them are easy to understand, easy to use - if you have the
right files and if you know how to use `M-e', that is roughly
equivalent to `C-e C-x C-e' -, easy to modify in useful ways (by
changing their arguments), easy to save in your notes with cut and
paste, and easy to share by chat.
Two of these sexps need files in hardcoded places - I used
~/Coetzee99.pdf and /tmp/foo/bar/2021-test-blocks.mp4 in the examples
above, but many functions in eev use a convention, explained here,
http://angg.twu.net/eev-intros/find-psne-intro.html
in which the name of the local copy is derived from the URL like this,
http://www.gnu.org/software/emacs/emacs-paper.html
-> $S/http/www.gnu.org/software/emacs/emacs-paper.html
and the environment variable S is $HOME/snarf. Also, if we put the
point on the url below
http://www.gnu.org/software/emacs/emacs-paper.html
and type M-x brep we get a temporary buffer containing something like
this,
• (eepitch-shell)
• (eepitch-kill)
• (eepitch-shell)
mkdir -p $S/http/www.gnu.org/software/emacs/
cd $S/http/www.gnu.org/software/emacs/
wget -nc 'http://www.gnu.org/software/emacs/emacs-paper.html'
So several things in the workshop will be much easier if everybody has
wget in the path. An un(tg)zipper is not very important - I only
realized this after my previous e-mail - but wget is.
[[]],
Eduardo Ochs
http://angg.twu.net/#eev
- Workshop to save M$ Windows users - help needed, Eduardo Ochs, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed, Jean Louis, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed, Eli Zaretskii, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed, Eduardo Ochs, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed, Eli Zaretskii, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed,
Eduardo Ochs <=
- Re: Workshop to save M$ Windows users - help needed, Tomas Hlavaty, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed, Eduardo Ochs, 2021/10/03
- Re: Workshop to save M$ Windows users - help needed, Tomas Hlavaty, 2021/10/04
- Re: Workshop to save M$ Windows users - help needed, Tomas Hlavaty, 2021/10/04
- Re: Workshop to save M$ Windows users - help needed, Eduardo Ochs, 2021/10/06
- Re: Workshop to save M$ Windows users - help needed, Emanuel Berg, 2021/10/06
- Re: Workshop to save M$ Windows users - help needed, Eli Zaretskii, 2021/10/06
- Re: Workshop to save M$ Windows users - help needed, Eduardo Ochs, 2021/10/07
- Re: Workshop to save M$ Windows users - help needed, Tomas Hlavaty, 2021/10/07
- Re: Workshop to save M$ Windows users - help needed, Eli Zaretskii, 2021/10/04