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58 lines
2.3 KiB
Bash
Executable File
58 lines
2.3 KiB
Bash
Executable File
#!/bin/sh
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# Drop whole-line `#` comments from the shell files under root/ IN A BUILD TREE.
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#
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# ./strip-shell.sh <dir>
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#
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# Same trade as strip-templates.sh and build-css.sh: the reader gets the comments from git, the
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# router gets the bytes. `root/etc/uci-defaults/30_luci-theme-footstrap` is 71% comment lines and
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# `root/lib/upgrade/keep.d/luci-theme-footstrap` is 95% (six lines of reasoning above one path).
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#
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# ONLY a line whose first non-blank character is `#`, and never the shebang. That rule is safe here
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# and the reason is checked, not assumed: sh has no block-comment syntax, so the only way a `#` can
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# be something other than a comment is inside a string or a heredoc — a trailing `# …` after code is
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# left alone because the line does not START with it, and there is no heredoc anywhere under root/
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# (grepped). If one is ever added, this script has to learn about it: a `# …` line inside a heredoc
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# is DATA.
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#
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# Files are matched by their shebang or by being under a directory whose contents are shell
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# (uci-defaults, keep.d), never by extension — none of them have one.
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set -e
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DIR="${1:-}"
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[ -n "$DIR" ] && [ -d "$DIR" ] || { echo "usage: strip-shell.sh <dir>" >&2; exit 1; }
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if find "$DIR" -type f -exec grep -l '<<' {} + 2>/dev/null | grep -q .; then
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echo "strip-shell: a heredoc appeared under $DIR — refusing (a '#' line inside one is DATA, not a comment)" >&2
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exit 1
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fi
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before=0
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after=0
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found=0
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for f in $(find "$DIR" -type f | sort); do
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# shell only: a shebang, or the two comment-only manifests this package ships
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case "$(head -c 2 "$f")" in
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'#!') ;;
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*) case "$f" in */keep.d/*) ;; *) continue ;; esac ;;
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esac
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found=$((found + 1))
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b=$(wc -c < "$f")
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awk 'NR == 1 && /^#!/ { print; next }
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/^[ \t]*#/ { next }
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{ print }' "$f" > "$f.tmp$$"
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# never leave a file that lost its shebang or came out empty
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if [ ! -s "$f.tmp$$" ]; then
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echo "strip-shell: $f came out empty — refusing" >&2
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rm -f "$f.tmp$$"
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exit 1
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fi
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cat "$f.tmp$$" > "$f" # cat, not mv: keep the original mode (uci-defaults must stay +x)
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rm -f "$f.tmp$$"
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a=$(wc -c < "$f")
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before=$((before + b))
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after=$((after + a))
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done
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[ "$found" -gt 0 ] || { echo "strip-shell: no shell file under $DIR" >&2; exit 1; }
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echo "strip-shell: $found file(s), $before -> $after bytes (-$((before - after)))"
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