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Add an environment variable ICDIFF_DEFAULTS to allow setting default flags #191

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Add an environment variable ICDIFF_DEFAULTS to allow setting default flags #191

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5 changes: 5 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -80,6 +80,11 @@ Show differences between files in a two column view.
'--color-map=separator:white,description:cyan
```

The environment variable `ICDIFF_DEFAULTS` can be set to a
space delimited list of default flag values. For example:

`export ICDIFF_DEFAULTS='-N -U3 --color-map=description:magenta_bold,separator:magenta_bold'`

## Using with Git

To see what it looks like, try:
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8 changes: 7 additions & 1 deletion icdiff
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Expand Up @@ -601,12 +601,18 @@ def set_cols_option(options):
def validate_has_two_arguments(parser, args):
if len(args) != 2:
parser.print_help()
print("\nThe environment variable ICDIFF_DEFAULTS can be set to a\n"
"space delimited list of default flag values.")
sys.exit()


def start():
parser = create_option_parser()
options, args = parser.parse_args()
arguments = sys.argv[1:]
defaults = os.getenv("ICDIFF_DEFAULTS")
if defaults != None:
arguments = defaults.split() + arguments
options, args = parser.parse_args(arguments)
validate_has_two_arguments(parser, args)
if not options.cols:
set_cols_option(options)
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