Created
February 6, 2024 17:55
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Script for aligning a Markdown table neatly. Put in your PATH as mdtable then use in Vim visual mode: !mdtable
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#!/usr/bin/env ruby | |
table = ARGF.read.chomp | |
parse_row = ->(row) { row.gsub(/^\||\|$/, "").split("|").map(&:strip) } | |
rows = table.each_line.map(&parse_row) | |
# Normalise column count | |
column_count = rows.map(&:length).max | |
rows = rows.map { |row| (row + ([""] * column_count)).take(column_count) } | |
# Find longest value for each column | |
columns = 1.upto(column_count).map { |n| rows.map { |row| row[n - 1] } } | |
column_widths = columns.map { |cells| cells.map(&:length).max } | |
# Expand each cell to the right size for its column | |
rows = rows.map do |row| | |
row.zip(column_widths).map do |value, length| | |
# If it's a header row, expand the dashes all the way across the cell | |
if value =~ /^[\s\-]{2,}$/ | |
"-" * (length + 2) | |
# Otherwise, pad the string to the correct length with spaces around | |
else | |
" #{value.ljust(length)} " | |
end | |
end | |
end | |
# Display the table | |
rows.each do |row| | |
puts "|#{row.join("|")}|" | |
end |
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