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43dfe3c8fa
Now that the Make Abstract Machine files are maintained manually
and not generated automatically, unused variables are an annoying
distraction -- and there are many.
But the language/format is very simple and very parseable using
shell, awk, etc. -- so this was easy to automate. All variables are
declared with 'setv' and they are used if an expansion of the form
${varname} exists (the braces are mandatory in Mamfiles).
bin/Mamfile_rm_unused_vars:
- Added for reference and future use.
src/*/*/Mamfile:
- Remove all unused 'setv' variable declarations.
30 lines
989 B
Bash
Executable file
30 lines
989 B
Bash
Executable file
#!/usr/bin/env sh
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IFS=''; set -fCu # safe mode: no split/glob = no quoting headaches
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CCn='
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' # newline
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let() { return $((!($1))); }
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# Remove unused variable definitions from a Mamfile.
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# Usage: Mamfile_rm_unused_vars <Mamfile >Mamfile.new
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#
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# Should work on all current POSIX compliant shells.
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# By Martijn Dekker <martijn@inlv.org>, 2021. Public domain.
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#
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# All variables are declared with 'setv' and they are used if an expansion
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# of the form ${varname} exists (the braces are mandatory in Mamfiles).
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mamfile=$(let $# && cat "$1" || cat)
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vars=$(printf '%s\n' $mamfile | awk '$1 == "setv" { print $2; }')
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rm_unused_ere=
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IFS=$CCn; for varname in $vars; do IFS=
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case $mamfile in
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*"\${$varname}"* )
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;;
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* ) # add with '|' separator for Extended Regular Expression
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rm_unused_ere="${rm_unused_ere:+$rm_unused_ere|}setv[[:blank:]]+$varname([[:blank:]]|$)" ;;
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esac
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done
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case $rm_unused_ere in
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'') printf '%s\n' $mamfile ;;
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*) printf '%s\n' $mamfile | grep -vE $rm_unused_ere ;;
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esac
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