dotzbhgrc

alias cdiff='cdiff -s -w 0'
alias emc='emacsclient -nw'

#zsh tweaks

## force emacs keymap
bindkey -e

## allow hash comments on the command line
setopt INTERACTIVE_COMMENTS

## M-Backspace deletes one filepath element at a time instead of the whole path
## stolen from https://unix.stackexchange.com/questions/258656/how-can-i-delete-to-a-slash-or-a-word-in-zsh
autoload -U select-word-style
select-word-style bash

# first install pip via their curl based installed using --user, then make sure it's in PATH
PYTHON_USER_BIN="$(python -c 'import site; print(site.USER_BASE)')/bin"
export PATH=$PYTHON_USER_BIN:$PATH

# beforehand install pyenv via their curl based installer
PYENV_BIN_DIR=~/.pyenv/bin
export PATH=$PYENV_BIN_DIR:$PATH
 eval "$(pyenv init --path)"

# prevent python to generate __pycache__ directories with bytecode
# this can lead to the infamous FileNotFoundError
# ...pytest_html/resources/style.css that is due to bytecode being
# reused among different brazil ws (since they're generated in
# brazil-package-cache cache_root which is reused among brazil
# workspaces)
export PYTHONDONTWRITEBYTECODE=1


# zsh version of bash's persistent history
setopt append_history # append rather then overwrite
setopt extended_history # save timestamp
setopt inc_append_history # add history immediately after typing a command


ZSH_HISTORY_FILE=~/.history

_get_line_num_last () {
  local attempts=0
  local line=0
  while true; do
    # Greps the last two lines that can be considered history records
    local lines="$(grep -anE '^: [0-9]{10}:[0-9]*?;' ${ZSH_HISTORY_FILE} | \
                 tail -n $((2 + attempts)) | head -2)"
    local previous_line="$(echo -E "$lines" | head -1)"
    # Gets the line number of the line being tested
    local line_attempt=$(echo -E "$lines" | tail -1 | cut -d':' -f1 | tr -d '\n')
    # If the previous (possible) history records ends with `\`, then the
    # _current_ one is part of a multiline command; try again.
    # Probably. Unless it was in turn in the middle of a multi-line
    # command. And that's why the last line should be saved.
    if [[ $line_attempt -ne $HISTORY_LAST_LINE ]] && \
       [[ $previous_line == *"\\" ]] && [[ $attempts -eq 0 ]];
    then
      ((attempts+=1))
    else
      line=$line_attempt
      break
    fi
  done
  echo -E "$line"
}

precmd() {
  local line_num_last="$(_get_line_num_last)"
  local date_part="$(gawk "NR == $line_num_last {print;}" ${ZSH_HISTORY_FILE} | cut -c 3-12)"
  local fmt_date="$(date -d @${date_part} +'%Y-%m-%d %H:%M:%S')"
  # I use awk itself to split the _first_ line only at the first `;`
  local command_part="$(gawk "
    NR == $line_num_last {
      pivot = match(\$0, \";\");
      print substr(\$0, pivot+1);
    }
    NR > $line_num_last {
      print;
    }" ${ZSH_HISTORY_FILE})"
  if [ "$command_part" != "$PERSISTENT_HISTORY_LAST" ]
  then
    echo -E "${fmt_date} | ${command_part}" >> ~/.persistent_history
    export PERSISTENT_HISTORY_LAST="$command_part"
    export HISTORY_LAST_LINE=$((1 + $(wc -l < ${ZSH_HISTORY_FILE})))
  fi
}


# enable edit current command line
autoload -z edit-command-line
zle -N edit-command-line
bindkey "^X^E" edit-command-line

# force preview for fzf (including bash history search - C-r)
export FZF_DEFAULT_OPTS='--bind="alt-p:toggle-preview" --preview-window="down:wrap" --preview="echo {}"'