refactor(common): Add common code to a shared directory

1 files changed, 86 insertions, 0 deletions

diff --git a/common/renew_copyright_header.sh b/common/renew_copyright_header.sh
new file mode 100755
index 0000000..edb0a65
--- /dev/null
+++ b/common/renew_copyright_header.sh
@@ -0,0 +1,86 @@
+#! /usr/bin/env sh
+
+# NOTE: This is the line length of the .licensure.yml header template **plus** the extra
+# line after the template comment.
+TEMPLATE_LINE_LENGTH=20
+
+PROJECT_ROOT="$(git rev-parse --show-toplevel)"
+
+remove() {
+    extension="$1"
+    file="$2"
+
+    # We need to differentiate, when removing the old copyright header, as some
+    # formatters do weird things to the file
+    case "$extension" in
+    # normal '#' comments (these are $TEMPLATE_LINE_LENGTH lines long)
+    "Makefile" | "toml" | "envrc" | "yml" | "gitignore" | "awk")
+        sed --in-place "1,${TEMPLATE_LINE_LENGTH}d" "$file"
+        ;;
+    # normal '/* ... */' like comments (these are $TEMPLATE_LINE_LENGTH + 2 lines long)
+    "c" | "h" | "md" | "rs")
+        length="$((TEMPLATE_LINE_LENGTH + 2))"
+        sed --in-place "1,${length}d;" "$file"
+        ;;
+    # alejandra (the nix formatter) removes the blank line after the comment,
+    # thus only $TEMPLATE_LINE_LENGTH - 1 lines
+    "nix")
+        length="$((TEMPLATE_LINE_LENGTH - 1))"
+        sed --in-place "1,${length}d;" "$file"
+        ;;
+    # Shell needs a shebang on the first line, only after the first line can we
+    # remove the $TEMPLATE_LINE_LENGTH lines
+    "sh")
+        sed --in-place "2,${TEMPLATE_LINE_LENGTH}d;" "$file"
+        licensure --in-place "$file"
+
+        TEMPLATE_LINE_LENGTH_NEW="$(($(yq --raw-output '.licenses | map(.template) | join("")' "$PROJECT_ROOT/.licensure.yml" | wc -l) + $(yq '.comments | last | .commenter.trailing_lines' "$PROJECT_ROOT/.licensure.yml")))"
+
+        # delete the current shebang
+        to="$((TEMPLATE_LINE_LENGTH_NEW + 1))"
+        sed --in-place "${TEMPLATE_LINE_LENGTH_NEW},${to}d;" "$file"
+
+        # add a new one
+        sed --in-place "1i#! /usr/bin/env sh" "$file"
+        ;;
+    *)
+        echo "File '$file' with extension '$extension' is not know yet, please add it!"
+        ;;
+    esac
+}
+
+list() {
+    echo "$extension -> $file"
+}
+
+if [ -f "$1" ]; then
+    file="$(realpath "$1")"
+    filename="$(basename -- "$file")"
+    extension="${filename##*.}"
+    filename="${filename%.*}"
+
+    if [ -n "$DRY_RUN" ]; then
+        list "$extension" "$file"
+    else
+        remove "$extension" "$file"
+    fi
+else
+    fd --type file --hidden . | while read -r file; do
+        if grep --quiet 'SPDX-License-Identifier: GPL-3.0-or-later' "$file"; then
+            filename="$(basename -- "$file")"
+            extension="${filename##*.}"
+            filename="${filename%.*}"
+
+            if [ -n "$DRY_RUN" ]; then
+                list "$extension" "$file"
+            else
+                remove "$extension" "$file"
+            fi
+        fi
+    done
+
+    if [ -z "$DRY_RUN" ]; then
+        licensure --in-place --project
+        nix fmt
+    fi
+fi