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+# New language plugin guide
+> Or how I learned to stop complaining and contribute to open source
+>
+> Written while building a plugin against gazelle v0.33.0
+
+So you aren't lucky enough to work in a fancy enough language to have a lovely
+gazelle plugin already written for you.
+
+Well buckle up, this is my rough notes as I dig in and try to understand and document
+this system so we can all benefit.
+
+
+To kick things off here's a short diagram of the general flow of gazelle
+
+```mermaid
+graph TD
+    Start[Start] --> Configure[Configure]
+    Configure --> Process_Workspace[Process WORKSPACE]
+    Process_Workspace --> Initialize_Directory_Walk[Initialize Directory Walk]
+    Initialize_Directory_Walk --> For_Each_Directory[For Each Directory]
+    For_Each_Directory --> Read_Build_File[Read Build File]
+    Read_Build_File --> Apply_Directives[Apply Directives]
+    Apply_Directives --> Generate_Rules_For_Each_Language[Generate Rules for Each Language]
+    Generate_Rules_For_Each_Language --> Merge_Rules[Merge Rules]
+    Merge_Rules --> More_Directories{More Directories?}
+    More_Directories -->|Yes| For_Each_Directory
+    More_Directories -->|No| Build_Rule_Index[Build Rule Index]
+    Build_Rule_Index --> For_Each_Rule[For Each Rule]
+    For_Each_Rule --> Resolve_Dependencies[Resolve Dependencies]
+    Resolve_Dependencies --> More_Rules{More Rules?}
+    More_Rules -->|Yes| For_Each_Rule
+    More_Rules -->|No| Final_Rule_Merging[Final Rule Merging]
+    Final_Rule_Merging --> Write_Build_Files[Write Build Files]
+    Write_Build_Files --> End[End]
+
+    style Generate_Rules_For_Each_Language fill:#b75eb7,stroke:#333,stroke-width:2px
+    style Resolve_Dependencies fill:#b75eb7,stroke:#333,stroke-width:2px
+```
+
+At a high level the pink boxes represent nodes where language plugins are directly involved,
+though as you'll see there are lots of lifecycle hooks where the language plugin code will be
+called.
+
+
+## The `Language` interface
+
+If you've read the [extend docs](./extend.md), you already know the first step to creating a
+new language plugin is implementing the [`language.Language` interface](https://godoc.org/github.com/bazelbuild/bazel-gazelle/language#Language)
+
+But what's not really covered in this is how the methods on this interface are called.
+
+Below is a list of how the methods of the `language.Language` interface are typically
+called during Gazelle's execution:
+
+1. `RegisterFlags(fs *flag.FlagSet, cmd string, c *config.Config)`
+    - Called early in the process to register language-specific command-line flags.
+
+2. `CheckFlags(fs *flag.FlagSet, c *config.Config) error`
+    - Called after flag parsing to validate and process the flags.
+
+3. `KnownDirectives() []string`
+    - Called to get a list of directives the language understands.
+
+4. `Configure(c *config.Config, rel string, f *rule.File)`
+    - Called for each directory to set up language-specific configuration.
+
+5. `Name() string`
+    - May be called at various points to identify the language.
+
+6. `Kinds() map[string]rule.KindInfo`
+    - Called to get information about the kinds of rules the language generates.
+
+7. `Loads() []rule.LoadInfo`
+    - Called to get information about the load statements needed for the language.
+    - Deprecated: Instead implement `ModuleAwareLanguage`'s `ApparentLoads`.
+
+8. `GenerateRules(args language.GenerateArgs) language.GenerateResult`
+    - Called for each directory to generate rules based on the files in that directory.
+
+9. `Imports(c *config.Config, r *rule.Rule, f *rule.File) []resolve.ImportSpec`
+    - Called for each rule to determine its imports.
+
+10. `Embeds(r *rule.Rule, from label.Label) []label.Label`
+    - Called to determine what other rules a given rule embeds.
+
+11. `Resolve(c *config.Config, ix *resolve.RuleIndex, rc *repo.RemoteCache, r *rule.Rule, imports interface{}, from label.Label)`
+    - Called for each rule to resolve its dependencies.
+
+12. `Fix(c *config.Config, f *rule.File)`
+    - Called to fix any issues in the build file before processing.
+
+Note that some methods like `Name()`, `Kinds()`, and `Loads()` might be called multiple times throughout the process. The core of your plugin's work will likely be in `GenerateRules()` and `Resolve()`.
+
+If your language implements additional interfaces like `language.RepoImporter` or `language.ModuleAwareLanguage`, those methods would be called at appropriate times as well.