chore: sed invocations for docs build to work on macOS (harttle#615)

* fix: sed invocations to work out of the box on macOS

These fixes make the sed invocations run on macOS but I am not sure if they will break the GNU sed invocations in return…

* fix: add macOS branches to the shell scripts

The sed command line was difficult (impossible?) to be made portable so I just added macOS conditions.

* Prototype the solution using an alias

It seems that this will not work because I keep getting "sedi: command not found".

* fix: use a Bash function instead of an alias to run sed portably

This seems to work on my local so let's see if it runs in the CI on GitHub.

* fix: use 2 spaces like the original scripts did

Not sure why VS Code went with 4.

* fix: use sedi for the build-changelog `1i\` part as well

I am curious if Ubuntu will handle the newline…

bin/build-changelog.sh

@@ -1,8 +1,17 @@
 #!/usr/bin/env bash
 
+# Run `sed` in a way that's compatible with both macOS (BSD) and Linux (GNU)
+sedi() {
+  if [[ "$OSTYPE" == "darwin"* ]]; then
+    sed -i '' "$@"
+  else
+    sed -i "$@"
+  fi
+}
+
 cd docs
 cp ../CHANGELOG.md source/tutorials/changelog.md
-sed -i \
+sedi \
   -e 's/{%/{% raw %}{%{% endraw %}/g' \
   -e 's/{{/{% raw %}{{{% endraw %}/g' \
   -e '1 s/"/\"/g' \
@@ -11,5 +20,7 @@ sed -i \
   source/tutorials/changelog.md
 cp source/tutorials/changelog.md source/zh-cn/tutorials/changelog.md
 
-sed -i '1i ---\ntitle: Changelog\nauto: true\n---\n' source/tutorials/changelog.md
-sed -i '1i ---\ntitle: 更新日志\nauto: true\n---\n' source/zh-cn/tutorials/changelog.md
+sedi -e '1i\
+ ---\ntitle: Changelog\nauto: true\n---\n' source/tutorials/changelog.md
+sedi -e '1i\
+ ---\ntitle: 更新日志\nauto: true\n---\n' source/zh-cn/tutorials/changelog.md

bin/build-contributors.sh

@@ -1,10 +1,19 @@
 #!/usr/bin/env bash
 
+# Run `sed` in a way that's compatible with both macOS (BSD) and Linux (GNU)
+sedi() {
+  if [[ "$OSTYPE" == "darwin"* ]]; then
+    sed -i '' "$@"
+  else
+    sed -i "$@"
+  fi
+}
+
 cp .all-contributorsrc docs/.all-contributorsrc
-sed -i \
-    -e 's/README.md/docs\/themes\/navy\/layout\/partial\/all-contributors.swig/g' \
-    -e 's/"contributorsPerLine": 7/"contributorsPerLine": 65535/g' \
-    docs/.all-contributorsrc
+sedi \
+  -e 's/README.md/docs\/themes\/navy\/layout\/partial\/all-contributors.swig/g' \
+  -e 's/"contributorsPerLine": 7/"contributorsPerLine": 65535/g' \
+  docs/.all-contributorsrc
 
 all-contributors --config docs/.all-contributorsrc generate
-sed -i 's/<br \/>.*<\/td>/<\/a><\/td>/g' docs/themes/navy/layout/partial/all-contributors.swig
+sedi 's/<br \/>.*<\/td>/<\/a><\/td>/g' docs/themes/navy/layout/partial/all-contributors.swig