laggardkernel

Clear Scrollback Buffer

Crtl + L doesn't ensure scrollback buffer is cleared.

# https://unix.stackexchange.com/a/531178/246718

# Common function
function clear-scrollback {
  # https://invisible-island.net/ncurses/man/clear.1.html
  # https://unix.stackexchange.com/a/375784/246718

laggardkernel

Create a base class RedisPipeline, whichever Pipeline inherits it get a redis connection. Access to the redis conn with self.redis_server.

Dependency: scrapy_redis.

# defaults.py
REDIS_ENCODING = "utf-8"
REDIS_FAILED_URLS_KEY = "%(spidername)s:failed_urls"

laggardkernel

function rsync-up {
  if ! (($#)); then
    echo "No host is provided" >/dev/stderr
    return 1
  fi
  local host="$1"
  local local_dir remote_dir cmd git_conf ignore_conf

  # https://git-scm.com/docs/gitignore

laggardkernel

There's not a complete hook system designed in Bash when compared with other modern shells. PROMPT_COMMAND variable is used as a hook in Bash, which is equivalent to precmd hook in ZSH, fish_prompt in Fish. For the time being, ZSH is the only shell I've known that has a chpwd hook builtin.

PROMPT_COMMAND

If set, the value is interpreted as a command to execute before the printing of each primary prompt ($PS1).

https://www.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Bash-Variables

chpwd Hook in Bash

laggardkernel

By default, ZSH hook chpwd is not triggered on shell startup. The tutorial here provides some ideas to fix this.

Trigger all chpwd_functions on startup

We can use a trick to define a function run only once on precmd and destruct itself automatically.

function _self_destruct_hook {
  local f
  for f in ${chpwd_functions}; do
    "$f"

laggardkernel

The post was created for the question [How to share config between vim and Neovim][question].

In this solution, we try to symlink ~/.config/nvim to ~/.vim, and make the conf compatible with vim.

# nvim conf dir: ~/.config/nvim
# vim conf dir: ~/.vim
# link the 1st as the 2nd with relative links

laggardkernel

Default umaks on macOS is 0077, which is different with most Linux distributions.

There're pros and cons about this very decision made by Apple. For the good part, temporary files generate under /tmp, $TMPDIR are accessible by the user himself only. These locations could be alternatives to $XDG_RUNTIME_DIR.

While, the problem is that since the new files are accessible by yourself only, it's inconvenient to share files with other users.

It's easy to change umask globally with a LauchAgent, or change it for shells

laggardkernel

  d_weechat:
    cmpignore:
    - '*/weechat_fifo'
    - '*/script/plugins.xml.gz'
    - '*/logs'
    dst: ~/.config/weechat
    src: .config/weechat
    trans: gpg-single "sec.conf"
    trans_write: gpg-single "sec.conf"

laggardkernel

_env_init() {
  # init version manager without rehash on startup
  local SHELL_NAME="zsh"
  local init_args=(- --no-rehash zsh)
  local zshrc="$HOME/.zshrc"
  
  # For security on Linux
  [[ -n $XDG_RUNTIME_DIR ]] && local TMPDIR="$XDG_RUNTIME_DIR"

laggardkernel

# catch empty strings into an array using `read`
# normal array assignment isn't able to catch emptry string.
 
unset k 2>/dev/null
while IFS=$'\n' read -r item; do k+=("$item"); done < <(printf "\n\n\n")
echo ${#k[@]}
[[ -z ${k[0]} ]] && echo "empty string is catched"


f() {