Check the width of comment lines

bin/check fails on a Go comment line over 80 columns, counted as
bin/reflow counts them, with tabs as 8 columns. gofumpt does not wrap
comments, and the line length linter would also count code lines, so a
long comment line passed every check.

diff --git a/bin/check b/bin/check
index 8449f47cb5337347752ee9ff0a39311ec467e4e2..98cce99e22a43953256ff08d28c852e1876eb223 100755 (executable)
--- a/bin/check
+++ b/bin/check
@@ -13,6 +13,15 @@ if [ -n "$unformatted" ]; then
   exit 1
 fi
 
   exit 1
 fi
 

+# Comment lines stay within the width of bin/reflow, with tabs as 8 columns.
+long=$(files '*.go' | while read -r file; do
+  expand -t8 "$file" | awk -v file="$file" 'length > 80 && /^[[:space:]]*\/\//{print file ":" FNR}'
+done)
+if [ -n "$long" ]; then
+  printf 'comment lines over 80 columns, run bin/reflow:\n%s\n' "$long" >&2
+  exit 1
+fi
+

 golangci-lint run
 go test -race ./...
 files '*.nix' | xargs nixfmt --check
 golangci-lint run
 go test -race ./...
 files '*.nix' | xargs nixfmt --check