Exclude

Summary

The exclude block in godel/config/godel.yml specifies patterns for paths and names that should be ignored.

Tutorial start state

• ${GOPATH}/src/${PROJECT_PATH} exists, is the working directory and is initialized as a Git repository
• Project contains godel and godelw
• Project contains main.go
• Project contains .gitignore that ignores GoLand files
• Project contains echo/echo.go, echo/echo_test.go and echo/echoer.go
• godel/config/dist-plugin.yml is configured to build echgo2
• Project is tagged as 0.0.1
• godel/config/dist-plugin.yml is configured to create distributions for echgo
• Project is tagged as 0.0.2
• Go files have license headers
• godel/config/godel.yml is configured to add the go-generate plugin
• godel/config/generate-plugin.yml is configured to generate string function

Exclude names/paths

In the previous step of the tutorial, we updated the exclude section of godel/config/godel.yml configuration file to specify that a generated source file should be excluded from checks. This portion of the tutorial examines the file in more detail.

Examine the current state of godel/config/godel.yml:

➜ cat godel/config/godel.yml
plugins:
  resolvers:
    - "https://palantir.bintray.com/releases/{{GroupPath}}/{{Product}}/{{Version}}/{{Product}}-{{Version}}-{{OS}}-{{Arch}}.tgz"
  plugins:
    - locator:
        id: "com.palantir.godel-generate-plugin:generate-plugin:1.0.0"
exclude:
  names:
    - "\\..+"
    - "vendor"
  paths:
    - "godel"
    - "echo/type_string.go"

As seen in the previous section, specifying echo/type_string.go as an exclude path caused this file to be ignored for all checks and operations. However, listing individual paths like this can be cumbersome and fragile -- for example, if we wanted to use stringer for other types or in other packages, this approach would require us to manually add each new entry.

We can make this approach more general by excluding all files that end in _string.go instead. Run the following to update the configuration:

➜ echo 'plugins:
  resolvers:
    - "https://palantir.bintray.com/releases/{{GroupPath}}/{{Product}}/{{Version}}/{{Product}}-{{Version}}-{{OS}}-{{Arch}}.tgz"
  plugins:
    - locator:
        id: "com.palantir.godel-generate-plugin:generate-plugin:1.0.0"
exclude:
  names:
    - "\\\\..+"
    - "vendor"
    - ".+_string.go"
  paths:
    - "godel"' > godel/config/godel.yml

Verify that the golint check still succeeds:

➜ ./godelw check golint
Running golint...
Finished golint

Check in the changes:

➜ git add godel/config/godel.yml
➜ git commit -m "Update exclude configuration in godel.yml"
[master 85105f6] Update exclude configuration in godel.yml
 1 file changed, 1 insertion(+), 1 deletion(-)

Tutorial end state

• ${GOPATH}/src/${PROJECT_PATH} exists, is the working directory and is initialized as a Git repository
• Project contains godel and godelw
• Project contains main.go
• Project contains .gitignore that ignores GoLand files
• Project contains echo/echo.go, echo/echo_test.go and echo/echoer.go
• godel/config/dist-plugin.yml is configured to build echgo2
• Project is tagged as 0.0.1
• godel/config/dist-plugin.yml is configured to create distributions for echgo
• Project is tagged as 0.0.2
• Go files have license headers
• godel/config/godel.yml is configured to add the go-generate plugin
• godel/config/generate-plugin.yml is configured to generate string function
• godel/config/godel.yml is configured to ignore all .+_string.go files

Tutorial next step

Write integration tests

More

Names, paths and default configuration

godel/config/godel.yml starts with the following defaults:

exclude:
  names:
    - "\\..+"
    - "vendor"
  paths:
    - "godel"

The names configuration specifies a list of names that should be ignored. The values can be literals or regular expressions. In either case, the value must fully match the name to be a match -- for regular expressions, this means that a name is considered a match only if the entire name matches the regular expression. The names configuration is useful for ignoring classes of files -- for example, .*\\.pb\\.go can be used to ignore all files that end in .pb.go.

The default configuration for names ignores all hidden files (names that start with .) and all vendor directories. vendor is specified as a name rather than a path so that vendor directories are ignored in all directories.

The paths configuration specifies a list of paths that should be ignored. Paths can be specified as literal values or as globs. The paths configuration is useful for ignoring specific files or directories that should be ignored.

The default configuration for paths ignores the godel directory in the root level of the project.

In the case of both names and paths, if the configuration matches a file, that file is ignored, while if it matches a directory, then that directory (and all of its contents) is ignored.