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-rw-r--r--Lib/json/tool.py39
1 files changed, 25 insertions, 14 deletions
diff --git a/Lib/json/tool.py b/Lib/json/tool.py
index 7db4528571..4f3182c0c1 100644
--- a/Lib/json/tool.py
+++ b/Lib/json/tool.py
@@ -10,28 +10,39 @@ Usage::
Expecting property name enclosed in double quotes: line 1 column 3 (char 2)
"""
-import sys
+import argparse
+import collections
import json
+import sys
+
def main():
- if len(sys.argv) == 1:
- infile = sys.stdin
- outfile = sys.stdout
- elif len(sys.argv) == 2:
- infile = open(sys.argv[1], 'r')
- outfile = sys.stdout
- elif len(sys.argv) == 3:
- infile = open(sys.argv[1], 'r')
- outfile = open(sys.argv[2], 'w')
- else:
- raise SystemExit(sys.argv[0] + " [infile [outfile]]")
+ prog = 'python -m json.tool'
+ description = ('A simple command line interface for json module '
+ 'to validate and pretty-print JSON objects.')
+ parser = argparse.ArgumentParser(prog=prog, description=description)
+ parser.add_argument('infile', nargs='?', type=argparse.FileType(),
+ help='a JSON file to be validated or pretty-printed')
+ parser.add_argument('outfile', nargs='?', type=argparse.FileType('w'),
+ help='write the output of infile to outfile')
+ parser.add_argument('--sort-keys', action='store_true', default=False,
+ help='sort the output of dictionaries alphabetically by key')
+ options = parser.parse_args()
+
+ infile = options.infile or sys.stdin
+ outfile = options.outfile or sys.stdout
+ sort_keys = options.sort_keys
with infile:
try:
- obj = json.load(infile)
+ if sort_keys:
+ obj = json.load(infile)
+ else:
+ obj = json.load(infile,
+ object_pairs_hook=collections.OrderedDict)
except ValueError as e:
raise SystemExit(e)
with outfile:
- json.dump(obj, outfile, sort_keys=True, indent=4)
+ json.dump(obj, outfile, sort_keys=sort_keys, indent=4)
outfile.write('\n')