fix #22 : convert LLM provider selection to switch statement

[adeeshperera]

• Replaced if-else with switch statement to explicitly handle all providers (gemini, chatgpt, claude, grok)
• Used existing commitLLM variable instead of multiple os.Getenv calls

Summary by CodeRabbit

• Refactor
  • Streamlined how the tool selects the AI provider for commit message generation for clearer, more maintainable behavior.
  • Added explicit handling for several popular provider options while preserving the existing fallback when unspecified or unrecognized.
  • No user configuration changes; outputs and performance remain consistent.

[coderabbitai]

Walkthrough

Refactors commit message generation dispatch in cmd/commit-msg/main.go from chained environment checks to a switch on the commitLLM variable. Adds explicit cases for "gemini", "chatgpt", and "claude", with a default to "grok". Per-LLM API key retrieval and behavior are preserved.

Changes

Cohort / File(s)	Summary
Dispatch refactor: LLM selection cmd/commit-msg/main.go	Replace environment-based if/else chain with a switch on commitLLM. Add cases for "gemini", "chatgpt", "claude", and a default to "grok". Keep per-provider API key retrieval and generation calls; no exported API changes.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor Dev as Developer
  participant CLI as commit-msg CLI
  participant Gemini as Gemini Provider
  participant ChatGPT as ChatGPT Provider
  participant Claude as Claude Provider
  participant Grok as Grok Provider

  Dev->>CLI: Run commit message generation
  CLI->>CLI: Read COMMIT_LLM -> commitLLM
  alt commitLLM == "gemini"
    CLI->>Gemini: Generate message (Gemini API key)
    Gemini-->>CLI: Commit message
  else commitLLM == "chatgpt"
    CLI->>ChatGPT: Generate message (OpenAI API key)
    ChatGPT-->>CLI: Commit message
  else commitLLM == "claude"
    CLI->>Claude: Generate message (Anthropic API key)
    Claude-->>CLI: Commit message
  else
    CLI->>Grok: Generate message (Grok API key)
    Grok-->>CLI: Commit message
  end
  CLI-->>Dev: Output commit message

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Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Fixed Inverted else clause #31 — Refactors COMMIT_LLM selection from if/else to switch-based dispatch in the same control-flow area.

Suggested labels

bug

Suggested reviewers

• DFanso

Poem

Thump-thump goes my coder heart, hop-hop through the switch I dart,
Ifs to cases, neat and snug, fallback cozy with Grok’s hug.
Keys in paws, I route with cheer,
Commit notes crisp and clear.
(_/) ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title succinctly describes the primary change—converting the LLM provider selection logic to a switch statement—and directly references the associated issue, making it clear and relevant to the changeset.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ce1d73e and 4934d22.

📒 Files selected for processing (1)

• cmd/commit-msg/main.go (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

• cmd/commit-msg/main.go

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: Build Go Binary (windows-latest)

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[coderabbitai]

Actionable comments posted: 1

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

cmd/commit-msg/main.go (1)

50-152: Fix inconsistent indentation.

The code block from line 50 onwards has extra indentation (appears to use tabs where it shouldn't). This is inconsistent with the indentation of the switch statements above and affects code readability.

Run gofmt or your IDE's formatter to correct the indentation:

#!/bin/bash
# Format the Go code
gofmt -w cmd/commit-msg/main.go

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between e4248b2 and ce1d73e.

📒 Files selected for processing (1)

• cmd/commit-msg/main.go (1 hunks)

🧰 Additional context used

🧬 Code graph analysis (1)

cmd/commit-msg/main.go (4)

internal/claude/claude.go (1)

• GenerateCommitMessage (33-85)

internal/chatgpt/chatgpt.go (1)

• GenerateCommitMessage (13-32)

internal/gemini/gemini.go (1)

• GenerateCommitMessage (13-44)

internal/grok/grok.go (1)

• GenerateCommitMessage (15-87)

🔇 Additional comments (1)

cmd/commit-msg/main.go (1)

25-48: LGTM with a caveat.

The switch statement correctly validates the LLM provider and retrieves the appropriate API key. However, note that the default case (line 47) will exit the program for any unrecognized or empty COMMIT_LLM value, which impacts the second switch statement's default case (see next comment).

[DFanso]

@adeeshperera can u check the suggestion and fix the issue

[DFanso]

LGTM 🎊