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#!/bin/sh
# Define the directory to iterate over from the first argument
dir="$1"
# Initialize the variable to hold the HTML list and date-file pairs
html=""
date_file_pairs=""
# Check if the directory exists
if [ -d "$dir" ]; then
# Find all Markdown files in the directory and store them in a variable
md_files=$(find "$dir" -maxdepth 1 -type f -name "*.md")
# Process each Markdown file in a regular loop (not in a subshell)
for md_file in $md_files; do
# Extract front matter using sed, ensure the file is quoted
front_matter=$(sed -n '/^---$/,/^---$/p' "$md_file")
# Extract date
date=$(echo "$front_matter" | grep '^date:' | sed 's/^date:[[:space:]]*//')
# If no date is found, use a default date
if [ -z "$date" ]; then
date="01-01-1970" # Default date if none is found
fi
# Add the date and file to the date_file_pairs variable, using printf to correctly append newlines
date_file_pairs=$(printf "%s\n%s|%s" "$date_file_pairs" "$date" "$md_file")
done
# Sort the date and file pairs by date
sorted_date_file_pairs=$(printf "%s" "$date_file_pairs" | sort -r -t "|" -k 1,1.2n -k 1.4,1.6n -k 1.8,1.12n)
# Create a file descriptor to avoid subshell issues
exec 3<<EOF
$sorted_date_file_pairs
EOF
# Generate the navigation list
html="<ol class=\"list\">"
while IFS= read -r pair <&3; do
# Split the pair into date and filename using | as a delimiter
date=$(printf "%s" "$pair" | cut -d'|' -f1)
md_file=$(printf "%s" "$pair" | cut -d'|' -f2)
# Ensure md_file is not empty (safety check)
[ -z "$md_file" ] && continue
# Extract front matter again using sed, ensure md_file is quoted
front_matter=$(sed -n '/^---$/,/^---$/p' "$md_file")
# Extract title
title=$(echo "$front_matter" | grep '^title:' | sed 's/^title:[[:space:]]*//')
# Use filename as a fallback if title is empty
if [ -z "$title" ]; then
# Get the base filename without extension, quote the argument
base_name=$(basename "$md_file" .md)
# Replace hyphens and underscores with spaces for display
title=$(echo "$base_name" | sed 's/-/ /g' | sed 's/_/ /g')
# Capitalize each word
title=$(echo "$title" | awk '{ for (i=1; i<=NF; i++) $i=toupper(substr($i,1,1)) substr($i,2); print }')
fi
# Format the date using POSIX-compliant date formatting
if formatted_date=$(date -d "$date" '+%Y-%m-%d' 2>/dev/null); then
: # formatted_date is valid
else
formatted_date="$date"
fi
# Construct the link href, quote the argument
href="/$dir/$(basename "${md_file%.md}.html")"
# Append to the HTML list
html="$html<li><a href=\"$href\">$title</a><span class="subtle">(published: <time datetime=$formatted_date>$formatted_date</time>)</span></li>"
done
html="$html</ol>"
# Close file descriptor
exec 3<&-
else
# If the directory doesn't exist, set a message
html="<p>No pages found.</p>"
fi
# Output the HTML list
echo "$html"
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