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Port more shell lint improvements from illumos and ksh93v- (#374)

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This commit adds onto <https://github.com/ksh93/ksh/pull/353> by porting
over two additional improvements to the shell linter:

1) The changes in the aforementioned pull request were merged into
   illumos-gate with an additional change.[*] The illumos revision of
   the patch improved the warning for (( $foo = $? )) to specify '$foo'
   causes the warning.[**] Example:
      $ ksh -n -c '(( $? != $bar ))'
      ksh: warning: line 1: in '(( $? != $bar ))', using '$' as in '$bar' is slower and can introduce rounding errors
   While I was porting the illumos patch I did notice one problem. The
   string it uses from paramsub() skips over the initial '{' in
   '${var}', resulting in the warning printing '$var}' instead:
      $ ksh -n -c '(( ${.sh.pid} != $$ ))'
      ...  in '(( ${.sh.pid} != $$ ))', using '$' as in '$.sh.pid}' is slower  ...
   This was fixed by including the missing '{' in the string returned by
   paramsub for ${var} variables.

2) In ksh93v-, parsing x=$((expr)) with the shell linter will cause ksh
   to warn the user x=$((expr)) is slower than ((x=expr)). This
   improvement has been backported with a modified warning:
      # Result from this commit
      $ ksh -n -c 'x=$((1 + 2))'
      ksh: warning: line 1: x=$((1 + 2)) is slower than ((x=1 + 2))
      # Result from ksh93v-
      $ ksh93v -n -c 'x=$((1 + 2))'
      ksh93v: warning: line 1: ((x=1 + 2)) is more efficient than x=$((1 + 2))
   Minor note: the ksh93v- patch had an invalid use of memcmp; this
   version of the patch uses strncmp instead.

References:
be548e87bc
65722363_22fdf8e7/
This commit is contained in:
Johnothan King 2021-12-12 13:25:07 -08:00 • committed by Martijn Dekker
parent 66a50ece82
commit cd562b16e2
5 changed files with 36 additions and 8 deletions
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6
NEWS
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@ -9,6 +9,12 @@ Any uppercase BUG_* names are modernish shell bug IDs.
as SIGINT due to Ctrl+C) while the user is entering a multi-line command
substitution in an interactive shell.
- The shell linter's warning for variable expansion in ((...)) now tells the
user which variable is causing performance degradation.
- The shell linter now warns the user x=$((expr)) is slower than ((x=expr))
when assigning a value to a variable.
2021-12-09:
- Increased the general robustness of discipline function handling, fixing