fix duplicate include statements

[arnemohr]

The issue occurs when protobuf.jl generates multiple includes for the same base proto file that's imported by several other proto files.

protos/Example
  /v1/
    base.proto      # gets imported by multiple other protos  
    feature1.proto  # imports base.proto
    feature2.proto  # also imports base.proto 

syntax = "proto3";

package Example.v1;

message Base {
  string id = 1;
  string name = 2;
}

syntax = "proto3";

package Example.v1;
import "Example/v1/base.proto";

message Feature1 {
  string id = 1;
  Example.v1.Base base = 2;
}

syntax = "proto3";

package Example.v1;
import "Example/v1/base.proto";

message Feature2 {
  string id = 1;
  Example.v1.Base base = 2;
}

After generating the sources the file v1_pb.jl contains multiple include statements

module v1

include("base_pb.jl")
include("base_pb.jl")
include("feature2_pb.jl")
include("feature1_pb.jl")

end # module v1

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.29%. Comparing base (2e80936) to head (961a8f1).

Files with missing lines	Patch %	Lines
src/codegen/toplevel_definitions.jl	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #256      +/-   ##
==========================================
- Coverage   92.99%   92.29%   -0.70%     
==========================================
  Files          25       25              
  Lines        2812     2817       +5     
==========================================
- Hits         2615     2600      -15     
- Misses        197      217      +20     

☔ View full report in Codecov by Sentry.
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[Drvi]

Hi! I tried the reproducer, and maybe I'm missing something, but when I generate the Julia bindings:

protojl(
    [
        "Example/v1/base.proto",
        "Example/v1/feature1.proto",
        "Example/v1/feature2.proto",
    ],
    "protos", # protos root
    "repro",  # output dir
)

I don't see any duplicate includes:

shell> cat repro/Example/Example.jl
module Example

include("v1/v1.jl")

end # module Example

shell> cat repro/Example/v1/v1.jl
module v1

include("base_pb.jl")
include("feature1_pb.jl")
include("feature2_pb.jl")

end # module v1

Can you please share how you generated the bindings?

[arnemohr]

@Drvi We went through the invocation and found the reason for the duplicates.
The search path was set to [".","./protos"] which then leads to duplicate includes. Adjusting the search path removed this issue. Nevertheless we were still able to produce the faulty behavior by using the wrong input. Maybe I will look into this someday. Will close the PR. Thx for the reply