Handle indentation #112
Description
Would be nice if hashin could handle indented files like this one:
https://github.com/liberapay/liberapay.com/blob/master/requirements_base.txt
boto3==1.9.85 \
--hash=sha256:acfd27967cf1ba7f9d83ad6fc2011764541e4c295fe0d896ea7b495cc2f03336 \
--hash=sha256:96296871863e0245b04931df7dd5c583e53cadbe1d54197829b34b03b0d048a8
botocore==1.12.85 \
--hash=sha256:af727d4af0cf1ddbf84eaf1cc9d0160ff066eac7f9e6a2fe6a75ccbed4452c98 \
--hash=sha256:c381fd05b777f41a608ea0846a8d8ecc32077a83e456d05e824cce8d6b213e32
Right now it just inserts a new entry below:
$ hashin -r ../../../requirements_base.txt botocore -d
--- Old
+++ New
@@ -258,3 +258,6 @@
asn1crypto==0.24.0 \
--hash=sha256:2f1adbb7546ed199e3c90ef23ec95c5cf3585bac7d11fb7eb562a3fe89c64e87 \
--hash=sha256:9d5c20441baf0cb60a4ac34cc447c6c189024b6b4c6cd7877034f4965c464e49
+botocore==1.12.221 \
+ --hash=sha256:6d49deff062d2ae0f03fc26b56df8b1bb9e8b136657bcd8d84c986a4068fb784 \
+ --hash=sha256:bbee3fdcbe56ca53e2c32c6c12d174fa9b4ffe27b633183c29bd5aec9e200bae