cut: consistent field list handling for -f

[mknos]

• handle_b() had been updated with more correct parser for field lists (including sorting fields and ranges)

• Move the list-spec parser into its own function and use it in handle_f() for "cut -f"

• handle_f() was looping over @hunk multiple times (incorrectly) when list-spec contained a comma

• Output tested against GNU version

• test1: echo 'a:b:c:d:e:f' | perl cut -d ':' -f 3,2,2,1
  a:b:c

• test2: echo 'a:b:c:d:e:f' | perl cut -d ':' -f -2
  a:b

• test3: echo 'a:b:c:d:e:f' | perl cut -d ':' -f 3
  c

• test4: echo 'a:b:c:d:e:f' | perl cut -d ':' -f 3-
  c:d:e:f

• test5: printf "a:b:c:d:e:f\nhey\n" | perl cut -d ':' -f 3-
  c:d:e:f
  hey

• test6: printf "a:b:c:d:e:f\nhey\n" | cut -s -d ':' -f 3-
  c:d:e:f

• test7: printf "a:b:c:d:e:f\n" | perl cut -d ':' -f 100
  ["\n" printed]

[coveralls]

Pull Request Test Coverage Report for Build 11734403755

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 73.069%

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Totals
Change from base Build 11732882413:	0.0%
Covered Lines:	350
Relevant Lines:	479

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💛 - Coveralls

[briandfoy]

changes: handle -f consistently