almostontop.plugin.zsh

source "${0:h}/version"

if [ "x$ALMOSONTOP" = "xfalse" ]; then
  # doing nothing here
else
  ALMOSONTOP=true
fi

if [ "$ALMOSTONTOP_COLOR" = "" ]; then
  ALMOSTONTOP_COLOR="green"
fi

function _accept_line_almostontop {
  if [ "x$ALMOSONTOP" = "xtrue" ]; then
    # 1. put cursor to the top of the screen
    tput cup 0 0
    # 2. redraw line with prompt and command (with highlighted text as well)
    zle redisplay
  fi
  zle .accept-line
}

zle -N accept-line _accept_line_almostontop

function almostontop
{
  # Help message if there no args
  if [ $# -eq 0 ]; then
    almostontop_usage
  fi

  local arg=$1
  if [ "x$arg" = "xon" ]; then
    ALMOSONTOP=true
  fi

  if [ "x$arg" = "xoff" ]; then
    ALMOSONTOP=false
  fi

  if [ "x$arg" = "xtoggle" ]; then
    almostontop_toggle
  fi
}

function almostontop_toggle
{
  if [ "x$ALMOSONTOP" = "xtrue" ]; then
    almostontop off
  else
    almostontop on
  fi
}

# Create widget so it could be bound with keys
zle -N almostontop_toggle almostontop_toggle

# "ctrl-X ctrl-L" to toggle almostontop, alike "ctrl-L" to clear screen
bindkey "^X^L" almostontop_toggle

function almostontop_usage
{
  cat <<-EOF
Usage: almostontop <command>

Commands:
  on     Enables almostontop plugin
  off    Disables almostontop plugin
  toggle Toggles almostontop plugin

Description:
  almostontop clears previous command output every time before new command
  executed in shell. Insipred by 'alwaysontop' plugin for bash:
  https://github.com/swirepe/alwaysontop

Version: $ALMOSTONTOP_VERSION
EOF
}