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implement -nnn style flags in argparse

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This implements support for numeric flags without an associated short or
long flag name. This pattern is used by many commands. For example `head
-3 /a/file` to emit the first three lines of the file.

Fixes #4214
This commit is contained in:
Kurtis Rader
2017-07-13 20:36:59 -07:00
parent 49a0841533
commit 63d601610d
8 changed files with 113 additions and 50 deletions
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9
tests/argparse.err
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@@ -6,7 +6,7 @@ argparse: Missing -- separator
argparse: No option specs were provided
# Invalid option specs
argparse: Invalid option spec 'h-' at char '-'
argparse: Invalid option spec '+help' at char 'h'
argparse: Short flag '+' invalid, must be alphanum or '#'
argparse: Invalid option spec 'h/help:' at char ':'
argparse: Invalid option spec 'h-help::' at char ':'
argparse: Invalid option spec 'h-help=x' at char 'x'
@@ -14,3 +14,10 @@ argparse: Invalid option spec 'h-help=x' at char 'x'
min-max: Expected at least 1 args, got only 0
min-max: Expected at most 3 args, got 4
min-max: Expected at most 1 args, got 2
# Invalid "#-val" spec
argparse: Short flag '#' does not allow modifiers like '='
# Invalid arg in the face of a "#-val" spec
argparse: Unknown option '-x'
Standard input (line 38):
argparse '#-val' -- abc -x def
^