#!/bin/sh
# Takes:
# ws-replace begin end origin dest commitident txt|csv script
# Begin:       <!-- ident:begin -->
# End:         <!-- ident:end -->
# Origin:      $HOME/docs/wr/orgd/kt/biblio.csv
# Dest:        $WEBSITE_PATH/rd/index.html
# Commitident: Biblio (: updated ...)
# Txt|Csv:     csv
# script:      biblio-by-month
# File         If Origin gives a directory (as for example, the script called 
#              will update a whole directory), then File gives the exact file 
#              to modify.
# If `txt`:
#   Removes all comments; treats each line as an entry,
#   and tab as the delimiter. Edits are made with: $EDITOR
#   or $VISUAL or nvim or vim or vi.
# If `csv`:
#   Calls out to an external script, $SCRIPT to generate
#   the HTML.
# Both then substitute the HTML in.

DELIMITER_BEGIN="$1"
DELIMITER_END="$2"
ORIGIN="$3"
DEST="$4"
COMMITIDENT="$5"
TXTCSV="$6"
SCRIPT="$7"
TABLE_FILE="/tmp/$5-formatted"
FILE="$8"

# Work out $EDITWITH
if [ "$TXTCSV" = "txt" ] ; then
	EDITWITH="$EDITOR"
	# TODO: add VISUAL, nvim, vim, vi...
else
	EDITWITH="sc-im"
fi

if [ -z "$FILE" ] ; then 
	hash_before="$(sha256sum $ORIGIN)"
	$EDITWITH "$ORIGIN"
	hash_after="$(sha256sum $ORIGIN)"
else
	# As $ORIGIN is a directory, so here we specify the exact file.
	hash_before="$(sha256sum "$ORIGIN/$FILE")"
	$EDITWITH "$ORIGIN/$FILE"
	hash_after="$(sha256sum "$ORIGIN/$FILE")"
fi

if [ "$hash_before" = "$hash_after" ] ; then 
	echo "No changes made - quitting early!"
	exit 0
fi

echo "Changes will be made."

formatted="$($SCRIPT "$ORIGIN")"
echo "$formatted" > "$TABLE_FILE"
sed -i -ne "/$DELIMITER_BEGIN/ {p; r $TABLE_FILE" -e ":a; n; /$DELIMITER_END/ {p; b}; ba}; p" "$DEST"

# Commit and push the changes
ws-push