Only modify changed or added files - not deleted ones (#967)

.github/workflows/generate_chapters.yml

@@ -37,8 +37,8 @@ jobs:
         echo "files changed in commit $COMMIT_SHA:"
         git diff-tree --no-commit-id --name-only -r $COMMIT_SHA
         echo "Incrementing any references to changed CSS files"
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/static/css | grep "\.css" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base/*/*.html
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/static/css | grep "\.css" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base.html
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/static/css | grep "\.css" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base/*/*.html
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/static/css | grep "\.css" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base.html
         git diff
     - name: Update JS version for modified CSS files
       env:
@@ -47,8 +47,8 @@ jobs:
         echo "files changed in commit $COMMIT_SHA:"
         git diff-tree --no-commit-id --name-only -r $COMMIT_SHA
         echo "Incrementing any references to changed JS files"
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/static/js | grep "\.js" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base/*/*.html
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/static/js | grep "\.js" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base.html
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/static/js | grep "\.js" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base/*/*.html
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/static/js | grep "\.js" | sed 's!.*/!!' | sed "s/\(.*\)/s\/\1?v=[0-9][0-9]*\/\1?v=$(date +%Y%m%d%H%M%S)\//" | sed -f - -i src/templates/base.html
         git diff
     - name: Update timestamp for modified files
       env:
@@ -57,10 +57,10 @@ jobs:
         echo "files changed in commit $COMMIT_SHA:"
         git diff-tree --no-commit-id --name-only -r $COMMIT_SHA
         echo "Updating timestamp in any markdown chapter files"
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/content | grep "^src\/content\/[a-z]*\/[0-9]*\/[a-z0-9-]*.md" | xargs -r sed -i "s/^last_updated: [0-9-]*T/last_updated: $(date '+%Y-%m-%d')T/"
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/content | grep "^src\/content\/[a-z]*\/[0-9]*\/[a-z0-9-]*.md" | xargs -r sed -i "s/^last_updated: [0-9-]*T/last_updated: $(date '+%Y-%m-%d')T/"
         echo "Updating timestamp in any template files"
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/templates | grep "^src\/templates\/[a-z][a-z]\/20[0-9][0-9]\/[a-zA-Z0-9_]*.html" | xargs -r sed -i "s/{% block date_modified %}[0-9-]*T/{% block date_modified %}$(date '+%Y-%m-%d')T/"
-        git diff-tree --no-commit-id --name-only -r $COMMIT_SHA src/templates | grep "^src\/templates\/[a-z][a-z]\/[a-zA-Z0-9_]*.html" | xargs -r sed -i "s/{% block date_modified %}[0-9-]*T/{% block date_modified %}$(date '+%Y-%m-%d')T/"
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/templates | grep "^src\/templates\/[a-z][a-z]\/20[0-9][0-9]\/[a-zA-Z0-9_]*.html" | xargs -r sed -i "s/{% block date_modified %}[0-9-]*T/{% block date_modified %}$(date '+%Y-%m-%d')T/"
+        git diff-tree --diff-filter=AM --no-commit-id --name-only -r $COMMIT_SHA src/templates | grep "^src\/templates\/[a-z][a-z]\/[a-zA-Z0-9_]*.html" | xargs -r sed -i "s/{% block date_modified %}[0-9-]*T/{% block date_modified %}$(date '+%Y-%m-%d')T/"
         echo "Updated timestamps:"
         git diff
     - name: Setup Node.js for use with actions