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Generate flag type lookup funcs

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This commit is contained in:
Dan Buch
2016-07-10 12:50:57 -04:00
parent 3a8ad862a6
commit 77f1130e65
4 changed files with 209 additions and 167 deletions
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24
generate-flag-types
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@@ -27,7 +27,9 @@ definition keys is:
"dest": false,
"doctail": " which really only wraps a []float64, oh well!",
"context_type": "[]float64",
"context_default": "nil"
"context_default": "nil",
"parser": "parseVeryMuchType(f.Value.String())",
"parser_cast": "[]float64(parsed)"
}
The meaning of each field is as follows:
@@ -45,7 +47,11 @@ The meaning of each field is as follows:
context_default (string) - The literal value used as the default by the
`*cli.Context` reader funcs when no value is
present
parser (string) - Literal code used to parse the flag `f`,
expected to have a return signature of
(value, error)
parser_cast (string) - Literal code used to cast the `parsed` value
returned from the `parser` code
"""
from __future__ import print_function, unicode_literals
@@ -116,6 +122,9 @@ def _write_flag_types(outfile, types):
typedef.setdefault('context_type', typedef['type'])
typedef.setdefault('dest', True)
typedef.setdefault('value', True)
typedef.setdefault('parser', 'f.Value, error(nil)')
typedef.setdefault('parser_cast', 'parsed')
_fwrite(outfile, """\
// {name}Flag is a flag with type {type}{doctail}
@@ -165,6 +174,17 @@ def _write_flag_types(outfile, types):
return {context_default}
}}
func lookup{name}(name string, set *flag.FlagSet) {context_type} {{
f := set.Lookup(name)
if f != nil {{
parsed, err := {parser}
if err != nil {{
return {context_default}
}}
return {parser_cast}
}}
return {context_default}
}}
""".format(**typedef))