Move some things around

6 files changed, 0 insertions, 631 deletions

diff --git a/personal/itches/emacs/bulk.md b/personal/itches/emacs/bulk.md
deleted file mode 100644
index 2de60f4..0000000
--- a/personal/itches/emacs/bulk.md
+++ /dev/null
@@ -1,273 +0,0 @@
-# Emacs
-
-- center/top point when
-    - moving to text/tag search hit
-    - going to man page section
-    - opening eww on an anchor
-    - visiting a function from its Help buffer
-- make font-lock stop background at fill-column or max(len(line) for
-  line in paragraph) rather than window-width when text spans >1 lines
-- shell-mode
-    - add faces instead of reusing font-lock-{comment,string}
-    - understand `autocd` and `cd !$`
-    - use Bash completions (e.g. `ls TAB` in a folder with one file)
-- [.dir-locals changed priorities][bug#30008] between subfolder and
-  major mode from 25 to 26
-- eshell: `ls --group-directories-first` does not color folders
-- eww, gnus-article: adapt filling to window width changes
-- scroll-lock-mode
-    - cursor stuck on lines wrapped by visual-line-mode
-    - cursor stuck on lines with 😛
-    - scroll when going down newline with forward-…
-- matching-paren analysis fails: `;; (here is\n;; a comment)`
-- some modes redefine C-M-h, which makes this binding hard to
-  override; could mark-defun consult functions/values exposed by major
-  modes instead?
-- Man-mode: make isearch skip end-of-line hyphens
-- when opening `.gpg` files in a TTY, some characters (e.g. TAB) are
-  swallowed by Emacs instead of being forwarded to the gpg prompt;
-  these characters are then inserted in the decrypted file's buffer
-  (see `epa-file-insert-file-contents`)
-- let TRAMP fetch Google Drive credentials from .authinfo.gpg
-- icomplete's C-j does not choose the first completion as advertised
-  on empty input; it chooses ".", which AFAICT comes from the fact
-  that icomplete-exhibit calls completion-pcm--filename-try-filter
-  while icomplete-force-complete-and-exit simply calls
-  minibuffer-force-complete-and-exit
-    - likewise, if a folder contains foo.c and foo.o, "C-x C-f foo"
-      hides foo.o, yet C-j completes to foo.o
-- calendar uses default X resources when run in its own frame; see
-  `calendar-frame-parameters`, `x-handle-named-frame-geometry`,
-  `(make-frame '((name . "")))` vs `(make-frame '((title . "")))`
-- use compilation-mode-line-… faces for compilation-num-… indicators
-- "é" is not erased with a single DEL stroke, despite [Unicode
-  conventions]
-- sort tar archive members by name; serving suggestion:
-
-    ``` elisp
-    (defun my/tar-sort (info)
-      (sort info (lambda (a b) (string< (tar-header-name a) (tar-header-name b)))))
-    ;; Apply to tar-parse-info in tar-summarize-buffer.
-    ```
-
-- add a command or minor mode to highlight marks; serving suggestion:
-
-    ``` elisp
-    (save-excursion
-      (dolist (m mark-ring)
-        (goto-char (marker-position m))
-        (pulse-momentary-highlight-region (point) (point-at-eol))
-        (sit-for 0.1)))
-    ```
-
-- StackOverflow-like suggestions when reporting bugs
-- match data vs. `:eval` during redisplay: cf. [bug#31586]
-- make vc honour `.gitignore` so that `project-find-file` completion
-  is not cluttered with ignored files
-- in a folder with a .git folder and a .gitignore file,
-    - `C-x C-f .gi TAB` completes to .gitignore
-    - `C-x C-f .git TAB` says "not unique"
-- add some Custom machinery to save additions/removals to list
-  variables; as things stand, once I add/remove items and save the
-  variable, I miss out on changes to the variable's default value:
-  e.g. `git-commit-setup-hook` recently added `bug-reference-mode`,
-  but I never realized it because I customized the hook to add some
-  personal functions
-- completions in python.el's comint buffer get confused when
-  readline's completion-prefix-display-length is set: candidates
-  become elided, maybe python-shell-completion-native-get-completions
-  is not ready for that?
-- some bindings advertised by `describe-mode` in texinfo-mode are
-  invalid:
-    - `C-c C-s` runs `Texinfo-insert-node` instead of
-      `texinfo-show-structure`
-    - `C-c C-e` runs `Texinfo-environment` instead of being a prefix
-      command for `texinfo-format-{buffer,region}`
-- [bug#31666]: visual-line-mode adds newlines before words that end up
-  being split anyway
-- `gnus-group-make-group` uses `message-y-or-n-p`, which relies on
-  `message-talkative-question`; the message might be too wide for the
-  temporary buffer where it is displayed, and `y-or-n-p` prevents the
-  user from moving to the buffer and looking at the rest of the
-  message.
-
-[bug#30008]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30008
-[bug#31586]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31586
-[bug#31666]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=31666
-[Unicode conventions]: https://lists.gnu.org/archive/html/emacs-devel/2018-07/msg00961.html
-
-## Dired
-
-- allow "columns" to be toggled; more specifically, make it possible
-  to hide ownership, permissions, number of hard links…
-
-- make the filename stand out
-
-- `% r` does not support some `\` constructs (`\#`, `\,`)
-
-- add a face for broken symbolic links
-
-## ERC
-
-- move timestamp to a better position (see `stamp` module)
-- play well with whitespace-mode
-
-## Org
-
-- dissociate sub- and super-script fontification from everything else
-  in org-toggle-pretty-entities
-
-- org-clocktable trips on DST:
-
-    ``` org
-    #+BEGIN: clocktable :scope file :maxlevel 2 :step day :stepskip0 t :tstart "[2018-10-15]" :tend "[2018-11-15]"
-    #+END:
-
-    * foo
-    :LOGBOOK:
-    CLOCK: [2018-10-26 Fri 08:00]--[2018-10-26 Fri 17:00] =>  9:00
-    :END:
-
-    * bar
-    :LOGBOOK:
-    CLOCK: [2018-10-29 Mon 08:00]--[2018-10-29 Mon 17:00] =>  9:00
-    :END:
-    ```
-
-- make org-ctrl-c-ctrl-c call `(org-clock-update-mode-line t)` when
-  point is on the clocked-in heading
-
-- new command `org-clock-in-late` to clock out x minutes ago from
-  previous task, and clock in x ago on task at point
-
-## read-passwd
-
-- prevent kills from ending up in the clipboard
-- add command to temporarily reveal password
-
-## whitespace-mode
-
-- skip line/wrap-prefix variables and properties
-
-- highlights the adaptive-wrap prefix, although weirdly enough the
-  whitespace *faces* are not applied
-
-- in org-indent-mode, adds a spurious (unfaced) space marker before
-  paragraphs; somehow transient-mark-mode knows not to highlight this
-  space, maybe the answer lies there
-
-## Ellipses customization
-
-Make ellipses for "invisible" text easily customizable (src/xdisp.c).
-Make them default to "…" when `(char-displayable-p ?…)`.
-
-Use-cases:
-
-- ibuffer truncation
-- hideshow
-- outline (org)
-- rgrep
-- magit-process
-
-## xref
-
-- search gz-compressed Elisp files when calling `xref-find-references`
-  from an Elisp buffer: from a user perspective, if
-  `xref-find-definitions` can visit those files,
-  `xref-find-references` should work too (even though technically they
-  don't rely on the same mechanisms)
-
-- defun-building macros seem hard to understand for xref: e.g. `M-.`
-  on `rg` does not jump to `rg-define-search rg`
-
-## External libraries
-
-### adaptive-wrap
-
-- a commented-out line with no space between the comment delimiter and
-  its text will get padded with the comment delimiter:
-
-        ;(some very long line)
-        ;; ⇒ wrapped with adaptive-wrap-extra-indent set to 4:
-        ;(some very
-        ;;;;;long line)
-
-### debbugs
-
-- asynchronous bug fetching
-
-### magit
-
-- customize current-tag function so that one can add `--first-parent`
-- prevent section highlight overlay from hiding tag face background
-- when quitting ediff conflict resolution, the "save buffer" prompt is
-  out of focus, one must ALT-TAB out of the ediff control panel first
-  (noticed in Emacs 27; 25.1 works fine); possible culprits:
-    - magit
-    - ediff
-    - smerge
-    - yes-or-no-p
-    - read-answer
-- make status buffer understand and display `typechange` e.g. when
-  replacing a replacing a regular file with a symlink
-- when ignoring a file in a subdirectory, magit attempts to
-  `git add .gitignore` (i.e. toplevel `.gitignore`), which fails
-- if the `-n` log option is set in the status buffer, the "unpulled
-  from origin/…" section shows an invalid commit count if the `-n`
-  limit is lower than the actual number of commits
-- for repos with dozens of old branches, it would be nice to have a
-  way to hide or distinguish "stale" branches from active ones, a la
-  <https://emba.gnu.org/emacs/emacs/branches>
-
-#### transient
-
-- cannot use the full domain of `--find-renames` (e.g. 1%)
-- cannot call transient-save for all transients (e.g. would like to
-  always `fetch --prune`)
-
-### markdown-mode
-
-- support [shortcut reference links]
-- move point past header after C-c C-t !/@
-- update sub-superscript regex to allow L~i+1~
-- make justification work with indented blockquotes
-- add "ini ↦ conf-mode" to markdown-code-lang-modes
-
-[shortcut reference links]: http://spec.commonmark.org/0.27/#shortcut-reference-link
-
-### rg-mode
-
-- make -project DTRT in dired
-
-### page-break-lines
-
-- borked in magit-diff
-
-### diff-hl
-
-- colored fringe line is discontinued on lines featuring faces with
-  heights greater than 1
-
-  ``` shell
-  $ git init
-  $ echo "* foo" > README.org
-  $ git add README.org ; git commit -m README.org README.org
-  $ echo "* bar" >> README.org
-  $ echo "* baz" >> README.org
-  ```
-
-  ``` elisp
-  (load-file "…/diff-hl.el")
-  (global-diff-hl-mode)
-  (set-face-attribute 'org-level-1 nil :height 1.2)
-  (find-file "README.org")
-  ```
-
-- in Org buffers with org-indent-mode, lines before point will "dance"
-  around while editing, i.e. while I type, they stick to the left
-  margin, then when I stop typing, they become indented again.
-
-### wgrep
-
-`C-c C-d` (`wgrep-mark-deletion`) could move to the next line, just
-like `d` moves to the next line in Dired buffers.
diff --git a/personal/itches/emacs/emoji.org b/personal/itches/emacs/emoji.org
deleted file mode 100644
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@@ -1,26 +0,0 @@
-Support for color fonts [[https://lists.gnu.org/archive/html/emacs-devel/2019-04/msg00996.html][has landed]] on version 27.0 (master).
-Remaining issues:
-
-* DONE Fix font-hinting =--with-cairo=
-
-Bug#35781 fixed by Yamamoto Mitsuharu.
-
-* TODO Check whether combining sequences work
-
-For example:, regional flags, ZWJ sequences from
-
-- ZWJ sequences from
-  <https://unicode.org/emoji/charts/emoji-zwj-sequences.html>:
-  - 🧟‍♂️, 🧟‍♀️
-  - 🐕‍🦺
-- regional indicators: 🇪🇺, 🇫🇷
-
-* TODO Add a convenient way to set a font for all emojis
-
-AFAICT there is no convenient way to =set-fontset-font= e.g. Noto
-  Color Emoji for "all emojis"; valid TARGETs for this function are
-    - single characters
-    - character ranges
-    - scripts, as defined in =script-representative-chars=
-    - charsets
-    - nil = any character not already covered by another font-spec
diff --git a/personal/itches/emacs/form-feed.md b/personal/itches/emacs/form-feed.md
deleted file mode 100644
index 61fd48b..0000000
--- a/personal/itches/emacs/form-feed.md
+++ /dev/null
@@ -1,56 +0,0 @@
-# Better out-of-the-box display for FORM FEED
-
-By default, FORM FEED is displayed as a dumb `^L` glyph.  This is
-surprising considering it shows up in so many places:
-
-- Emacs source files (C and Elisp),
-- help buffers:
-    - `describe-mode`,
-    - `describe-bindings`,
-    - `view-emacs-news`,
-- log buffers:
-    - `*Compile-Log*`,
-    - `*Dired log*`,
-- …
-
-You can even see it in source files of other GNU projects, like GCC.
-
-"Pages" are important enough to have their own navigation and
-narrowing commands, yet their default delimiter is displayed as an
-unassuming control character.
-
-I like the way form feeds are displayed with [`page-break-lines`];
-magit's `show-lines` blaming style achieves a similar look.
-
-Having this kind of display by default would make it more obvious that
-this character has actual navigation semantics; as it stands, it looks
-no different from some stray CARRIAGE RETURN.
-
-This hypothetical thin-line display could be re-used by e.g.:
-
-- `describe-symbol`, which uses the following method to visually break
-  up multiple symbol definitions:
-
-  ``` lisp
-  (insert "\n\n"
-          (eval-when-compile
-            (propertize "\n" 'face '(:height 0.1 :inverse-video t)))
-          "\n")
-  ```
-
-- Custom buffers, where sections are delimited visually with a
-  999-character wide underlined space.
-
-(See [emacs-devel][emacs-devel-thin-line] for a use-case recap.)
-
-Full disclosure
-:   This reflection started because moving over this underlined space
-    with `truncate-lines` on causes the screen to jump horizontally.
-    This specific problem should be fixable without dragging FORM FEED
-    display into the discussion, but I feel like the latter is the
-    more interesting issue ([who on Earth] enables `truncate-lines` by
-    default anyway).
-
-[`page-break-lines`]: https://github.com/purcell/page-break-lines
-[emacs-devel-thin-line]: https://lists.gnu.org/archive/html/emacs-devel/2019-05/msg00268.html
-[who on Earth]: https://gitlab.com/peniblec/dotfiles/blob/master/.emacs-custom.el
diff --git a/personal/itches/emacs/language-support.org b/personal/itches/emacs/language-support.org
deleted file mode 100644
index 8d007d3..0000000
--- a/personal/itches/emacs/language-support.org
+++ /dev/null
@@ -1,59 +0,0 @@
-* Python
-** Fix builtin/keyword fontification for Python 3
-E.g. =print= became a builtin.
-*** TODO add fontification tests
-*** TODO have dedicated font-lock styles for Python 2, 3 and "mixed"
-Default to "mixed" (rely on tests to ensure user-visible change).
-**** TODO create font-lock styles
-**** TODO create variable to choose style
-Users could customize it or set it wiht directory-local variables.
-*** TODO add heuristic to pick the "right" style
-** Fontify f-strings
-E.g. =f'an {expression} that should be highlighted'=.
-
-
-* Shell scripts
-** Fix builtin/keyword fontification
-- =continue= and =break= are /builtins/.
-** Fontify variables within strings
-E.g. ="an ${expression} that should be highlighted"=.
-** Do not highlight single-quoted command substitutions
-E.g. ='this $(call) should not be highlighted'=.
-** Fix indentation on continuation lines
-#+BEGIN_SRC shell
-# cf
-# - electric-indent-post-self-insert-function
-# - indent-according-to-mode
-# - indent-line-function => smie-indent-line
-# - smie-indent-functions
-# - smie-indent-exps
-# => calls smie-backward-sexp, which does not skip over ${foo}
-foobar \
-    indentis4
-foo_bar \
-    indentisstill4
-${foo}bar \
-      indentisfoobar
-#+END_SRC
-
-
-* Makefile
-** Recognize [[http://austingroupbugs.net/view.php?id=330][POSIX "immediate-expansion"]] operator ~::=~
-
-
-* Assembly
-** =C-o= inserts a tab despite =indent-tabs-mode= being nil
-This seems to come from the mode setting =fill-prefix=.  The mode also
-does not adhere to the "~RET~ = smart newline, ~C-j~ = dumb linefeed"
-convention for no good reason AFAICT.
-
-
-* TeX
-** electric-pair-mode and $inline math$
-e-p-m inserts a closing $ after point, but inserts a new pair instead
-of overwriting when pressing $ again.
-** AUCTeX
-*** electric-pair-mode does not work
-**** pressing ="= on active region does not surround it with quotes even with electric-pair-mode
-TeX-insert-quote erases the region and inserts =``= instead.
-**** pressing =$= inserts a single $
diff --git a/personal/itches/emacs/narrow-lighter.md b/personal/itches/emacs/narrow-lighter.md
deleted file mode 100644
index e5987b8..0000000
--- a/personal/itches/emacs/narrow-lighter.md
+++ /dev/null
@@ -1,209 +0,0 @@
-# Make " Narrow" lighter customizable
-
-The " Narrow" string comes from `src/xdisp.c:decode_mode_spec`:
-
-``` c
-case 'n':
-  if (BUF_BEGV (b) > BUF_BEG (b) || BUF_ZV (b) < BUF_Z (b))
-    return " Narrow";
-```
-
-This is probably just a matter of returning the contents of a Lisp
-variable instead of this constant string.
-
-TODO:
-
-1. get the string value of a variable in C
-2. define a customizable string variable
-3. write a news entry
-4. write a patch
-5. extra credits: display string properties
-
-## Get the string value of a variable in C
-
-`decode_mode_spec` has some relevant snippets:
-
-- Given a `Lisp_Object obj`, `SSDATA(obj)` gives the string value as a
-  `char*`.
-
-- How to get a variable's `Lisp_Object`?
-    - `BVAR` works for buffer-local variables
-    - `V${lispname//-/_}`
-
-## Define a customizable string variable
-
-### Defining variables visible to C code
-
-The C macro `DEFVAR_LISP(string-name, field-name)` does the following:
-
-    define a static `Lisp_Objfwd` variable v
-    get the address of globals._f##field-name &f
-
-    defvar_lisp(v, string-name, &f)
-
-As explained in the comments above `DEFVAR_LISP`, `globals` is a
-global variable defined in `globals.h`, which is "auto-generated by
-make-docfile" and exposes fields, `#define`s and `Lisp_Object`s for
-every global variable.
-
-make-docfile (`lib-src/make-docfile.c`) takes C files as input and
-searches all occurences of `^ +DEFSYM[ \t(]`, `^ +DEFVAR_[ILB]` or
-`^DEFU`, analyses what comes after and generates appropriate
-definitions for `globals.h`.
-
-`defvar_lisp` allocates a symbol using `Fmake_symbol`.
-
-### Making it customizable
-
-`lisp/cus-start.el` defines customizable properties of symbols defined
-by C code.
-
-AFAICT, there is no need to assign the default value right after
-defining the variable with `DEFVAR_LISP`: e.g. `shell-file-name` is
-`DEFVAR_LISP`ed in `src/callproc.c` and its default value is set in…
-Mmm.  Not in `cus-start.el`.  There is this snippet in
-`callproc.c:init_callproc`:
-
-  ``` c
-sh = getenv ("SHELL");
-Vshell_file_name = build_string (sh ? sh : "/bin/sh");
-  ```
-
-But when starting with `SHELL=rofl emacs -Q`, Custom says that the
-value "has been changed outside Customize".  Changed from what to
-what?
-
-`cus-start.el` may contain a hint:
-
-``` elisp
-;; Elements of this list have the form:
-;; …
-;; REST is a set of :KEYWORD VALUE pairs.  Accepted :KEYWORDs are:
-;; :standard - standard value for SYMBOL (else use current value)
-;; …
-```
-
-Except that nope, this does not work.  Giving `:standard " Narrow"`
-and looking at the variable in Custom yields
-
-    narrow-lighter: nil
-        [State]: CHANGED outside Customize. (mismatch)
-
-A better example might be `overlay-arrow-string`, whose default value
-is set right after `DEFVAR_LISP` by calling `build_pure_c_string`.
-
-Why `build_pure_c_string` and not `build_string`?  From "(elisp) Pure
-Storage":
-
-> Emacs Lisp uses two kinds of storage for user-created Lisp objects:
-> “normal storage” and “pure storage”.  Normal storage is where all
-> the new data created during an Emacs session are kept (see Garbage
-> Collection).  Pure storage is used for certain data in the preloaded
-> standard Lisp files—data that should never change during actual use
-> of Emacs.
->
-> Pure storage is allocated only while ‘temacs’ is loading the
-> standard preloaded Lisp libraries.  In the file ‘emacs’, it is
-> marked as read-only (on operating systems that permit this), so that
-> the memory space can be shared by all the Emacs jobs running on the
-> machine at once.
-
-"(elisp) Building Emacs" explains that "temacs" is the minimal Elisp
-interpreter built by compiling all C files in `src/`; temacs then
-loads Elisp sources and creates the "emacs" executable by dumping its
-current state into a file.
-
-## Debug stuff
-
-### Unicode characters represented as octal sequences
-
-Trying to customize the new variable to any string with non-ASCII
-characters fails: they show up as sequences of backslash-octal codes.
-For some reason they show up fine in the Help and Custom buffers.
-
-Things to investigate:
-
-1. Should the `Lisp_Object` be created with something other than
-   `build_pure_c_string`? 🙅
-2. What does the code calling `decode_mode_spec` do with the returned
-   string? **🎉**
-3. (Does `SSDATA` make some transformation before returning the
-   string? 🤷)
-4. (Should a specialized Custom setter be defined? 🤷)
-
-#### Should the `Lisp_Object` be created with something other than    `build_pure_c_string`?
-
-Maybe this would work?
-
-``` c
-Vnarrow_lighter = make_multibyte_string(" Narrow", strlen(" Narrow"),
-                                        strlen(" Narrow)");
-```
-
-That looks too ugly though, let's try something else.
-
-Maybe `STRING_SET_MULTIBYTE(Vnarrow_lighter)` would help?
-
-*compiles and tries*
-
-… Nope, it does not.
-
-#### What does the code calling `decode_mode_spec` do with the returned string?
-
-``` c
-spec = decode_mode_spec (it->w, c, field, &string);
-multibyte = STRINGP (string) && STRING_MULTIBYTE (string);
-```
-
-*slowly turns around*
-
-*finds `string` standing right there with a blank stare*
-
-Gah!  How long have you been there?
-
-``` c
-/* Return a string for the output of a mode line %-spec for window W,
-   generated by character C.  […]  Return a Lisp string in
-   *STRING if the resulting string is taken from that Lisp string.
-   […] */
-static const char *
-decode_mode_spec (struct window *w, register int c, int field_width,
-                  Lisp_Object *string)
-{
-  Lisp_Object obj;
-  /* … */
-  obj = Qnil;
-  *string = Qnil;
-
-  switch (c)
-    {
-    /* … */
-    }
-
-  if (STRINGP (obj))
-    {
-      *string = obj;
-      return SSDATA (obj);
-    }
-  else
-    return "";
-}
-```
-
-Alright then:
-
-``` c
-case 'n':
-  if (BUF_BEGV (b) > BUF_BEG (b) || BUF_ZV (b) < BUF_Z (b))
-      obj = Vnarrow_lighter;
-  break;
-```
-
-### Why do string properties not show up?
-
-🤷
-
-## Extra credit
-
-Maybe it would be simpler to have the narrowing lighter work like the
-" Compiling" lighter (cf. `compilation-in-progress` variable), i.e. adding an entry to `minor-mode-alist`.
diff --git a/personal/itches/emacs/unfiltered.org b/personal/itches/emacs/unfiltered.org
deleted file mode 100644
index 8bc9b52..0000000
--- a/personal/itches/emacs/unfiltered.org
+++ /dev/null
@@ -1,8 +0,0 @@
-* eglot + pyls: how to add myproject/src to path so that definition/completion works?
-* rg/deadgrep: add user-customizable predicate to control default
---no-ignore (eg nil by default = don't add the flag; or user-function
-to add it whenever project-root is ~)
-* add "fr10x" to quail-keyboard-layout-alist
-then try to figure out how to input dot and comma with russian-computer input method (with describe-input-method)
-
-