ad-editor 0.4.0

An adaptable text editor
Documentation 
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#!/usr/bin/env bash
# Toggle line commenting for the lines within dot based on the filetype.
#
# This script requires a data file containing mappings between ad filetype
# names and the comment string that should be used for adding and removing
# line comments.
# 
# Each line in the file should be of the form "$filetype $comment_str". e.g.
#   bash #
#   rust //
#   toml #

source "$HOME/.ad/lib/ad.sh"

FTYPE_COMMENT_STRS="$HOME/.ad/lib/ftype-comment-chars.txt"

requireAd
addr="$(bufRead "$AD_BUFID" addr | sed -E 's/(.+):.+,(.+):.+/\1,\2/')"
ftype="$(bufRead "$AD_BUFID" filetype)"
comment_str="$(grep "$ftype" "$FTYPE_COMMENT_STRS" | cut -d' ' -f2)"

if [ -z "$comment_str" ]; then
  adCtl "echo no configured comment string for $ftype"
  exit 1
fi

echo '-,/\n/' | bufWrite "$AD_BUFID" xaddr # expand xdot to full lines

# If every line starts with the comment string then we're uncommenting otherwise
# we're commenting out everything, even lines that already start with the comment
# string
xdot="$(bufRead "$AD_BUFID" xdot)"
n_lines="$(echo "$xdot" | wc -l)"
n_comment_lines="$(echo "$xdot" | grep "^\\s*$comment_str" | wc -l)"

if [ "$n_lines" != "$n_comment_lines" ]; then
  # expand to lines -> for each line -> insert comment_str at the start
  adEdit "-,/\\n/ x/.*\\n/ i:$comment_str :"
else
  # expand to lines -> for each line start up to comment_str -> remove comment_str
  adEdit "-,/\\n/ x/.+\\n/ n:^(\\s*?)$comment_str ?: c/{1}/"
fi

echo "$addr" | bufWrite "$AD_BUFID" addr
adCtl "echo addr was '$addr'"