Eason0210

Automatic python version plus venv

Goal

For easy editor integration and command-line usage, we'd like to be able to specify a Python version per project, with its own virtualenv to isolate its libraries from those of other projects.

We're willing to change $PATH globally once, but not per project. And we'd like to avoid having to run every python command invocation in a special subshell created by a shell wrapper. Instead, simply invoking "python" or "pip" etc. should do the right thing, based on the directory in which it is invoked.

It turns out this is possible!

Eason0210

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;; MyEmacsKeymap.ahk
;; - An AutoHotkey script to simulate Emacs keybindings on Windows
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;; Settings for testing
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;; enable warning
;#Warn All, MsgBox

Eason0210

# Instructions for fresh install

$ sh <(curl -L https://nixos.org/nix/install) --darwin-use-unencrypted-nix-store-volume --daemon
# reboot
$ source /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
$ echo 'export NIX_PATH=darwin-config=$HOME/.nixpkgs/darwin-configuration.nix:$HOME/.nix-defexpr/channels${NIX_PATH:+:}$NIX_PATH' | tee -a ~/.zshrc
$ echo 'source $HOME/.nix-profile/etc/profile.d/hm-session-vars.sh' | tee -a ~/.zshrc
$ nix-channel --add https://nixos.org/channels/nixpkgs-unstable
$ nix-channel --add https://github.com/LnL7/nix-darwin/archive/master.tar.gz darwin
$ nix-channel --add https://github.com/nix-community/home-manager/archive/master.tar.gz home-manager

Eason0210

Nix on macOS Catalina

I'm writing this gist for my own records but it might help someone else too.

Installing Nix

Support for Catalina has improved a lot since the update was first rolled out.

Note: See the NixOS manual for discussion of the --darwin-use-unencrypted-nix-store-volume option.

Eason0210

git archive --format=tar.gz -o /tmp/my-repo.tar.gz --prefix=my-repo/ master

Eason0210

Write-Host "Enter connection details:"

$server = "localhost"
$server_maybe = (Read-Host -Prompt "Server [$server]")
If($server_maybe -ne "") {
	$server = $server_maybe
}

$db = "postgres"

Eason0210

(let ((orig (default-value 'repeat-echo-function))
	rcol ccol in-repeat)
    (setq
     repeat-echo-function
     (lambda (map)
       (if orig (funcall orig map))
       (unless rcol (setq rcol (face-foreground 'error)))
       (if map
	   (unless in-repeat		; new repeat sequence
	     (setq in-repeat t

Eason0210

Build Emacs with MSYS2

This document is an up-to-date guide on compile Emacs 31 on windows with MSYS2, and make a installation with native compile that can work without MSYS2.

The idea is after get a working Emacs, you may delete MSYS2 environment to save some disk space, and forget about rebuilding Emacs until the next time you feel need to, without need figuring out everything again.