How to instruct clang-format to add EOL-character at file's end?

Question

Maybe I miss something, but still didn't find such a setting. Formally speaking clang-format doesn't produce proper UNIX text files, since last lines always lack EOL-character.

Answer 1

Option 1:

Found and outside ref. which could help you, "You can recursively add an EOL-character / sanitize the files from here..."

git ls-files -z "*.cpp" "*.hpp" | while IFS= read -rd '' f; do tail -c1 < "$f" | read -r _ || echo >> "$f"; done

Explanation:

git ls-files -z "*.cpp" "*.hpp" //lists files in the repository matching the listed patterns. You can add more patterns, but they need the quotes so that the * is not substituted by the shell but interpreted by git. As an alternative, you could use find -print0 ... or similar programs to list affected files - just make sure it emits NUL-delimited entries.

while IFS= read -rd '' f; do ... done //iterates through the entries, safely handling filenames that include whitespace and/or newlines.

tail -c1 < "$f" reads the last char from a file.

read -r _ exits with a nonzero exit status if a trailing newline is missing.

|| echo >> "$f" appends a newline to the file if the exit status of the previous command was nonzero.

---

Option 2 from Clang format script:

#!/bin/bash

set -e

function append_newline {
    if [[ -z "$(tail -c 1 "$1")" ]]; then
        :
    else
        echo >> "$1"
    fi
}

if [ -z "$1" ]; then
    TARGET_DIR="."
else
    TARGET_DIR=$1
fi

pushd ${TARGET_DIR} >> /dev/null

# Find all source files using Git to automatically respect .gitignore
FILES=$(git ls-files "*.h" "*.cpp" "*.c")

# Run clang-format
clang-format-10 -i ${FILES}

# Check newlines
for f in ${FILES}; do
    append_newline $f
done

popd >> /dev/null