web/_scripts/sh/dump_lastmod.sh

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2020-04-09 22:15:51 +03:00
#!/bin/bash
#
# Find out the posts that have been modified and record
# its lastmod information to file '_data/updates.yml'
#
# Usage:
# Call from the '_posts' sibling directory.
#
# v2.2
# https://github.com/cotes2020/jekyll-theme-chirpy
# © 2020 Cotes Chung
# Published under MIT License
set -eu
POST_DIR=_posts
OUTPUT_DIR=_data
OUTPUT_FILE=updates.yml
_init() {
if [[ ! -d "$OUTPUT_DIR" ]]; then
mkdir "$OUTPUT_DIR"
fi
if [[ -f "$OUTPUT_DIR/$OUTPUT_FILE" ]]; then
rm -f "$OUTPUT_DIR/$OUTPUT_FILE"
fi
touch "$OUTPUT_DIR/$OUTPUT_FILE"
}
_has_changed() {
local _log_count=`git log --pretty=%ad $1 | wc -l | sed 's/ *//'`
_log_count=$(($_log_count + 0))
if [[ $_log_count > 1 ]]; then
return 0 # true
fi
return 1 # false
}
###################################
# Storage the posts' lastmod.
#
# Args:
# - $1 the post's filename
# - $2 the post's filepath
# Output:
# the file '_data/updates.yml'
###################################
_dump() {
local _lasmod="`git log -1 --pretty=%ad --date=iso $2`"
echo "-" >> "$OUTPUT_DIR/$OUTPUT_FILE"
echo " filename: '$1'" >> "$OUTPUT_DIR/$OUTPUT_FILE"
echo " lastmod: '$_lasmod'" >> "$OUTPUT_DIR/$OUTPUT_FILE"
}
main() {
_init
local _count=0
for _file in $(ls -r "$POST_DIR")
do
_filepath="$POST_DIR/$_file"
_filename="${_file%.*}" # jekyll cannot read the extension of a file, so omit it.
_filename=${_filename:11} # remove the date
if _has_changed "$_filepath"; then
_dump "$_filename" "$_filepath"
((_count=_count+1))
fi
done
if [[ $_count > 0 ]]; then
echo "[INFO] Success to update lastmod for $_count post(s)."
fi
}
main