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-= ANN: remembering - Add memory to dmenu, fzf and similar tools
-:categories: ann
-
-:remembering: https://euandreh.xyz/remembering/
-:dmenu: https://tools.suckless.org/dmenu/
-:fzf: https://github.com/junegunn/fzf
-
-Today I pushed v0.1.0 of {remembering}[remembering], a tool to enhance the
-interactive usability of menu-like tools, such as {dmenu}[dmenu] and {fzf}[fzf].
-
-== Previous solution
-
-:yeganesh: https://dmwit.com/yeganesh/
-
-I previously used {yeganesh}[yeganesh] to fill this gap, but as I started to
-rely less on Emacs, I added fzf as my go-to tool for doing fuzzy searching on
-the terminal.  But I didn't like that fzf always showed the same order of
-things, when I would only need 3 or 4 commonly used files.
-
-For those who don't know: yeganesh is a wrapper around dmenu that will remember
-your most used programs and put them on the beginning of the list of
-executables.  This is very convenient for interactive prolonged use, as with
-time the things you usually want are right at the very beginning.
-
-But now I had this thing, yeganesh, that solved this problem for dmenu, but
-didn't for fzf.
-
-I initially considered patching yeganesh to support it, but I found it more
-coupled to dmenu than I would desire.  I'd rather have something that knows
-nothing about dmenu, fzf or anything, but enhances tools like those in a useful
-way.
-
-== Implementation
-
-:v-010: https://euandre.org/git/remembering/tree/remembering?id=v0.1.0
-:getopts: https://www.opengroup.org/onlinepubs/9699919799/utilities/getopts.html
-:sort: https://www.opengroup.org/onlinepubs/9699919799/utilities/sort.html
-:awk: https://www.opengroup.org/onlinepubs/9699919799/utilities/awk.html
-:spencer-quote: https://en.wikipedia.org/wiki/Henry_Spencer#cite_note-3
-
-Other than being decoupled from dmenu, another improvement I though that could
-be made on top of yeganesh is the programming language choice.  Instead of
-Haskell, I went with POSIX sh.  Sticking to POSIX sh makes it require less
-build-time dependencies.  There aren't any, actually.  Packaging is made much
-easier due to that.
-
-The good thing is that the program itself is small enough ({v-010}[119 lines] on
-v0.1.0) that POSIX sh does the job just fine, combined with other POSIX
-utilities such as {getopts}[getopts], {sort}[sort] and {awk}[awk].
-
-The behaviour is: given a program that will read from STDIN and write a single
-entry to STDOUT, `remembering` wraps that program, and rearranges STDIN so that
-previous choices appear at the beginning.
-
-Where you would do:
-
-[source,sh]
-----
-$ seq 5 | fzf
-
-  5
-  4
-  3
-  2
-> 1
-  5/5
->
-----
-
-And every time get the same order of numbers, now you can write:
-
-[source,sh]
-----
-$ seq 5 | remembering -p seq-fzf -c fzf
-
-  5
-  4
-  3
-  2
-> 1
-  5/5
->
-----
-
-On the first run, everything is the same.  If you picked 4 on the previous
-example, the following run would be different:
-
-[source,sh]
-----
-$ seq 5 | remembering -p seq-fzf -c fzf
-
-  5
-  3
-  2
-  1
-> 4
-  5/5
->
-----
-
-As time passes, the list would adjust based on the frequency of your choices.
-
-I aimed for reusability, so that I could wrap diverse commands with
-`remembering` and it would be able to work.  To accomplish that, a "profile"
-(the `-p something` part) stores data about different runs separately.
-
-I took the idea of building something small with few dependencies to other
-places too: - the manpages are written in troff directly; - the tests are just
-more POSIX sh files; - and a POSIX Makefile to `check` and `install`.
-
-I was aware of the value of sticking to coding to standards, but I had past
-experience mostly with programming language standards, such as ECMAScript,
-Common Lisp, Scheme, or with IndexedDB or DOM APIs.  It felt good to rediscover
-these nice POSIX tools, which makes me remember of a quote by
-{spencer-quote}[Henry Spencer]:
-
-____
-Those who do not understand Unix are condemned to reinvent it, poorly.
-____
-
-== Usage examples
-
-Here are some functions I wrote myself that you may find useful:
-
-=== Run a command with fzf on `$PWD`
-
-[source,sh]
-----
-f() {
-  profile="$f-shell-function(pwd | sed -e 's_/_-_g')"
-  file="$(git ls-files | \
-            remembering -p "$profile" \
-                        -c "fzf --select-1 --exit -0 --query \"$2\" --preview 'cat {}'")"
-  if [ -n "$file" ]; then
-    # shellcheck disable=2068
-    history -s f $@
-    history -s "$1" "$file"
-  "$1" "$file"
-fi
-}
-----
-
-This way I can run `f vi` or `f vi config` at the root of a repository, and the
-list of files will always appear on the most used order.  Adding `pwd` to the
-profile allows it to not mix data for different repositories.
-
-=== Copy password to clipboard
-
-:pass: https://www.passwordstore.org/
-
-[source,sh]
-----
-choice="$(find "$HOME/.password-store" -type f                  | \
-            grep -Ev '(.git|.gpg-id)'                           | \
-            sed -e "s|$HOME/.password-store/||" -e 's/\.gpg$//' | \
-            remembering -p password-store \
-                        -c 'dmenu -l 20 -i')"
-
-
-if [ -n "$choice" ]; then
-  pass show "$choice" -c
-fi
-----
-
-Adding the above to a file and binding it to a keyboard shortcut, I can access
-the contents of my {pass}[password store], with the entries ordered by usage.
-
-=== Replacing yeganesh
-
-Where I previously had:
-
-[source,sh]
-----
-exe=$(yeganesh -x) && exec $exe
-----
-
-Now I have:
-
-[source,sh]
-----
-exe=$(dmenu_path | remembering -p dmenu-exec -c dmenu) && exec $exe
-----
-
-This way, the executables appear on order of usage.
-
-If you don't have `dmenu_path`, you can get just the underlying `stest` tool
-that looks at the executables available in your `$PATH`.  Here's a juicy
-one-liner to do it:
-
-[source,sh]
-----
-$ wget -O- https://dl.suckless.org/tools/dmenu-5.0.tar.gz | \
-    tar Ozxf - dmenu-5.0/arg.h dmenu-5.0/stest.c          | \
-    sed 's|^#include "arg.h"$|// #include "arg.h"|'       | \
-    cc -xc - -o stest
-----
-
-With the `stest` utility you'll be able to list executables in your `$PATH` and
-pipe them to dmenu or something else yourself:
-
-[source,sh]
-----
-$ (IFS=:; ./stest -flx $PATH;) | sort -u | remembering -p another-dmenu-exec -c dmenu | sh
-----
-
-In fact, the code for `dmenu_path` is almost just like that.
-
-== Conclusion
-
-:packaged: https://euandre.org/git/package-repository/
-
-For my personal use, I've {packaged}[packaged] `remembering` for GNU Guix and
-Nix.  Packaging it to any other distribution should be trivial, or just
-downloading the tarball and running `[sudo] make install`.
-
-Patches welcome!