use date parsing utilities to minimize metadata block (#30)

* use date parsing utilities to minimize metadata block

* use a gnu compatible invocation of sed

* export the variable

* try using step outputs

action.yml

@@ -39,6 +39,15 @@ runs:
         's/^---$/\\newpage/g;1s/\\newpage/---/g'
         ${{ inputs.input-md }}
       shell: sh
+    # Grab the date from the front matter and generate the full date and year.
+    - run: |
+        DATE=$(grep date: ${{ inputs.input-md }} | head -n 1 | cut -d ' ' -f 2)
+        YEAR=$(date --date=$DATE +%Y)
+        echo "::set-output name=year::$YEAR"
+        DATE_ENGLISH=$(date --date=$DATE "+%B %-d, %Y")
+        echo "::set-output name=date-english::$DATE_ENGLISH"
+      shell: bash
+      id: date
     - run: >
         pandoc
         --embed-resources
@@ -51,6 +60,8 @@ runs:
         --toc
         --variable=block-headings
         --variable=table-use-row-colors
+        --metadata=date-english:"${{ steps.date.outputs.date-english }}"
+        --metadata=year:"${{ steps.date.outputs.year }}"
         --metadata=titlepage:true
         --metadata=titlepage-background:/resources/img/cover.png
         --metadata=logo:/resources/img/tcg.png

sample1.md

@@ -2,9 +2,7 @@
 title: "Lorem Ipsum Platform Dolor Sit Amet Profile for TPM 2.0"
 version: 0.1
 revision: 196
-date-english: August 11, 2022
-date: 8/11/2022
-year: 2022
+date: 2022/8/2
 type: SPECIFICATION
 status: DRAFT
 lot: true

sample2.md

@@ -2,9 +2,7 @@
 title: "Important TCG Document"
 version: 1.0
 revision: 3
-date-english: August 11, 2022
 date: 8/11/2022
-year: 2022
 type: SPECIFICATION
 status: PUBLISHED
 lof: true