Module: Lexdrill::ShellSnippet

Defined in:

lib/lexdrill/shell_snippet.rb

Overview

Generates the zsh/bash shell integration snippet for drill hook. Show-frequency throttling (drill rand <n>) lives entirely in drill next itself, not in these snippets, so it applies equally to hook-triggered and manually-run calls.

Constant Summary

ZSH =

<<~SNIPPET
  drill_precmd() {
    [[ -f "$HOME/.drill.disabled" ]] && return
    command drill next 2>/dev/null
  }
  if [[ -z "${precmd_functions[(r)drill_precmd]}" ]]; then
    precmd_functions+=(drill_precmd)
  fi
SNIPPET

BASH =

Hooks via PS1 (re-evaluated on every prompt) rather than PROMPT_COMMAND, since some environments (e.g. Google Cloud Shell's bashrc.google) snapshot and overwrite PROMPT_COMMAND after the fact, silently dropping anything appended to it. Output goes straight to /dev/tty so the word is never captured into the PS1 string itself (which would need readline's \[..\] non-printing markers to avoid cursor/line-wrap glitches from the color codes).

<<~SNIPPET
  drill_precmd() {
    [ -f "$HOME/.drill.disabled" ] && return
    command drill next >/dev/tty 2>/dev/null
  }
  case "$PS1" in
    *'$(drill_precmd)'*) ;;
    *) PS1="${PS1}"'$(drill_precmd)' ;;
  esac
SNIPPET

Class Method Summary

• .for(shell_name) ⇒ Object

Class Method Details

.for(shell_name) ⇒ Object

# File 'lib/lexdrill/shell_snippet.rb', line 36

def self.for(shell_name)
  case shell_name.to_s
  when "zsh" then ZSH
  when "bash" then BASH
  else
    raise ArgumentError, "unsupported shell #{shell_name.inspect} (expected \"zsh\" or \"bash\")"
  end
end