👎	👍

• Applies google's official protobuf style guide
• Indentation with 2 spaces
• Import groups are sorted alphabetically
• Makes all string literals double quoted: option opt = 'foo'; => option opt = "foo";
• Makes all enum fields uppercase: enum E { field = 1 } => enum E { FIELD = 1 }
• Makes opening braces on the declaration line: message M {
• Strips redundant semicolons: enum E { A = 0;;;; };;;; => enum E {A = 0;}
• Full comment support

protofmt is written in Haskell, you can use cabal to install it.

git clone https://github.com/pabloariasal/protofmt.git
cd protofmt
cabal install

Just pass the file to be formatted:

protofmt <path_to_unformatted_proto_file>

Example:

$ cat unformatted.proto
syntax = 'proto3';
message M { string field = 1; };

$ protofmt unformatted.proto
syntax = "proto3";
message M {
  string field = 1;
}

$ protofmt unformatted.proto | tee formatted.proto
syntax = "proto3";
message M {
  string field = 1;
}

$ cat formatted.proto
syntax = "proto3";
message M {
  string field = 1;
}

• Only protobuf 3
• inf and nan are not supported as floating point literals (PR welcome)
• enum fields must be decimal literals (no hex, octal or binary) (PR welcome)
• No service definitions (PR welcome)
• No optional nor required keywords supported (PR welcome)

• Only one file can be processed at once
• No --in-place flag supported
• No --recursive flag supported
• No --diff flag to display a diff between formatted and unformatted file (status code 0 if no diff)