Instructions

These instructions define how GitHub Copilot should assist with this Go project. The goal is to ensure consistent, high-quality code generation aligned with Go idioms, the chosen architecture, and our team's best practices.

🧠 Context

Project Type: CLI Tool
Language: Go
Framework / Libraries: cobra, testify, charmbracelet/bubbles
Architecture: Modular MVU (Model-View-Update) + Command Pattern

🔧 General Guidelines

Follow idiomatic Go conventions (https://go.dev/doc/effective_go).
Use named functions over long anonymous ones.
Organize logic into small, composable functions.
Prefer interfaces for dependencies to enable mocking and testing.
Use
```
gofmt
```
or
```
goimports
```
to enforce formatting.
Avoid unnecessary abstraction; keep things simple and readable.
Use
```
context.Context
```
for request-scoped values and cancellation.

👾 TUI Guidelines

Component Structure:
- Each distinct UI element or view should generally be implemented as its own
```
bubble
```
  .
- Follow the standard
```
bubbles
```
  pattern:
  - ```
  Model
```
  : Struct containing the component's state.
- ```
Init()
```
    : Returns the initial command (often
```
nil
```
    ).
  - ```
  Update(msg tea.Msg)
```
  : Handles incoming messages/events and updates the model. Returns
```
  (tea.Model, tea.Cmd)
```
  .
- ```
View()
```
    : Renders the component's UI as a string based on the current model state.
- Keep
```
Update
```
  functions focused; delegate complex logic to helper methods or separate functions.
- Use
```
tea.BatchMsg
```
  to batch multiple commands returned from
```
Update
```
  .
State Management:
- Prefer local state within each component's
```
Model
```
  .
- For shared state or communication between components, use
```
tea.Msg
```
  passing:
  - Parent components can pass messages down during their
```
Update
```
    .
  - Child components can send messages up for the parent (or root)
```
Update
```
    function to handle.
- Avoid global state for TUI components. If necessary, inject shared dependencies (like services or data repositories) into the root TUI model during initialization.
Interaction & Messages:
- Define custom
```
tea.Msg
```
  types (structs or simple types) for specific application events (e.g.,
```
dataLoadedMsg
```
  ,
```
errorOccurredMsg
```
  ,
```
itemSelectedMsg
```
  ).
- Use
```
tea.KeyMsg
```
  for handling keyboard input within
```
Update
```
  . Check
```
key.Type
```
  or use
```
key.Matches
```
  .
- Commands (
```
tea.Cmd
```
  ) should be used for I/O operations (API calls, DB access, timers) to avoid blocking the
```
Update
```
  loop. The results of these commands should be sent back as
```
tea.Msg
```
  .
Styling:
- Use
```
lipgloss
```
  for styling text, borders, layouts, etc.
- Define reusable styles in
```
internal/util/styles.go
```
  and reference them within component
```
View
```
  methods.
- Ensure styles adapt reasonably to different terminal sizes where possible.

Layout:

Use

lipgloss

functions like

lipgloss.JoinVertical

lipgloss.JoinHorizontal

, and

lipgloss.Place

for arranging components.

📁 File Structure

Use this structure as a guide when creating or updating files:

app/
  app.go
cmd/
  root.go
internal/
  controller/
  service/
  repository/
  model/
  config/
  middleware/
  utils/
pkg/
  logger/
  errors/
tests/
  unit/
  integration/

🧶 Patterns

✅ Patterns to Follow

Use Clean Architecture and Repository Pattern.
Implement input validation using Go structs and validation tags (e.g., go-playground/validator).
Use custom error types for wrapping and handling business logic errors.
Logging should be handled via
```
charmbracelet/log
```
.
Use dependency injection via constructors (avoid global state).
Keep
```
main.go
```
minimal—delegate to
```
internal
```
.

🚫 Patterns to Avoid

Don’t use global state unless absolutely required.
Don’t hardcode config—use environment variables or config files.
Don’t panic or exit in library code; return errors instead.
Don’t expose secrets—use
```
.env
```
or secret managers.
Avoid embedding business logic in HTTP handlers.

🧪 Testing Guidelines

Use
```
testing
```
and testify for assertions and mocking.
Organize tests under
```
tests/unit/
```
and
```
tests/integration/
```
.
Mock external services (e.g., DB, APIs) using interfaces and mocks for unit tests.
Include table-driven tests for functions with many input variants.
Follow TDD for core business logic.

🔁 Iteration & Review

Review Copilot output before committing.
Refactor generated code to ensure readability and testability.
Use comments to give Copilot context for better suggestions.
Regenerate parts that are unidiomatic or too complex.

📚 References

🔧 General Guidelines

Follow idiomatic Go conventions (https://go.dev/doc/effective_go).

Use named functions over long anonymous ones.

Organize logic into small, composable functions.

Prefer interfaces for dependencies to enable mocking and testing.

Use

gofmt

goimports

to enforce formatting.

Avoid unnecessary abstraction; keep things simple and readable.

Use

context.Context

for request-scoped values and cancellation.

👾 TUI Guidelines

Component Structure:

Each distinct UI element or view should generally be implemented as its own
```
bubble
```
.
Follow the standard
```
bubbles
```
pattern:
- ```
Model
```
  : Struct containing the component's state.
- ```
Init()
```
  : Returns the initial command (often
```
nil
```
  ).
- ```
Update(msg tea.Msg)
```
  : Handles incoming messages/events and updates the model. Returns
```
(tea.Model, tea.Cmd)
```
  .
- ```
View()
```
  : Renders the component's UI as a string based on the current model state.
Keep
```
Update
```
functions focused; delegate complex logic to helper methods or separate functions.
Use
```
tea.BatchMsg
```
to batch multiple commands returned from
```
Update
```
.

State Management:

Prefer local state within each component's
```
Model
```
.
For shared state or communication between components, use
```
tea.Msg
```
passing:
- Parent components can pass messages down during their
```
Update
```
  .
- Child components can send messages up for the parent (or root)
```
Update
```
  function to handle.
Avoid global state for TUI components. If necessary, inject shared dependencies (like services or data repositories) into the root TUI model during initialization.

Interaction & Messages:

Define custom
```
tea.Msg
```
types (structs or simple types) for specific application events (e.g.,
```
dataLoadedMsg
```
,
```
errorOccurredMsg
```
,
```
itemSelectedMsg
```
).
Use
```
tea.KeyMsg
```
for handling keyboard input within
```
Update
```
. Check
```
key.Type
```
or use
```
key.Matches
```
.
Commands (
```
tea.Cmd
```
) should be used for I/O operations (API calls, DB access, timers) to avoid blocking the
```
Update
```
loop. The results of these commands should be sent back as
```
tea.Msg
```
.

Styling:

Use
```
lipgloss
```
for styling text, borders, layouts, etc.
Define reusable styles in
```
internal/util/styles.go
```
and reference them within component
```
View
```
methods.
Ensure styles adapt reasonably to different terminal sizes where possible.

Layout:

Use

lipgloss

functions like

lipgloss.JoinVertical

lipgloss.JoinHorizontal

, and

lipgloss.Place

for arranging components.

🧶 Patterns

Use Clean Architecture and Repository Pattern.

Implement input validation using Go structs and validation tags (e.g., go-playground/validator).

Use custom error types for wrapping and handling business logic errors.

Logging should be handled via

charmbracelet/log

Use dependency injection via constructors (avoid global state).

Keep

main.go

minimal—delegate to

internal

Don’t use global state unless absolutely required.

Don’t hardcode config—use environment variables or config files.

Don’t panic or exit in library code; return errors instead.

Don’t expose secrets—use

.env

or secret managers.

Avoid embedding business logic in HTTP handlers.

Instructions

Instructions

🧠 Context

🔧 General Guidelines

👾 TUI Guidelines

📁 File Structure

🧶 Patterns

✅ Patterns to Follow

🚫 Patterns to Avoid

🧪 Testing Guidelines

🔁 Iteration & Review

📚 References

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Instructions

🧠 Context

🔧 General Guidelines

👾 TUI Guidelines

📁 File Structure

🧶 Patterns

✅ Patterns to Follow

🚫 Patterns to Avoid

🧪 Testing Guidelines

🔁 Iteration & Review

📚 References