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x/tools/go/ast/astutil: AddImport removes imports #17212

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rhysh opened this issue Sep 23, 2016 · 6 comments
Closed

x/tools/go/ast/astutil: AddImport removes imports #17212

rhysh opened this issue Sep 23, 2016 · 6 comments
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@rhysh
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rhysh commented Sep 23, 2016

Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

$ go version
go version go1.7.1 darwin/amd64

golang/tools@3f4088e

What operating system and processor architecture are you using (go env)?

$ go env
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/rhys/work"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/49/zmds5zsn75z1283vtzxyfr5hj7yjq4/T/go-build054967312=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"

What did you do?

I added a test case to golang.org/x/tools/go/ast/astutil's imports_test.go for adding an import of "net/http" the following file:

package main

import "bufio"
import "net/url"

What did you expect to see?

I expected the output file to include all three imports, probably in a single import block.

package main

import (
    "bufio"
    "net/http"
    "net/url"
)

What did you see instead?

package main

import "bufio"

It seems that this doesn't happen when the new package doesn't share a prefix with an existing package, or when the packages are all listed in a single block-style import.
@bradfitz
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You want to fix?

@bradfitz bradfitz added this to the Unreleased milestone Sep 23, 2016
@rhysh rhysh mentioned this issue Sep 23, 2016
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@rhysh
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rhysh commented Sep 23, 2016

I'll take a stab at it, though I'm not yet familiar with manipulating the AST.

Do you want to review?

@bradfitz
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I'm scarred by and now scared of the AST package.

I think @griesemer likes those CLs. :-)

@griesemer
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@bradfitz "likes" is a strong word. I prefer "unfortunately spent too much time with"... - I'll review it, but I cannot promise a quick turn-around as I am under water at the moment with other stuff.

@rhysh
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rhysh commented Sep 24, 2016

I've got a fix (https://golang.org/cl/29688), though I may have messed up the multi-commit workflow (it requires the change for #17213). I'd be happy to do them as a single commit, if that ends up being easier.

@gopherbot
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CL https://golang.org/cl/29688 mentions this issue.

@golang golang locked and limited conversation to collaborators Oct 18, 2017
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