Commit based version selection

src/chameleon_utils.ts

@@ -4,8 +4,10 @@ import GreptileAPI from './greptile'
 interface ChangelogConfig {
   owner: string
   repo: string
-  startDate: Date
-  endDate: Date
+  startDate?: Date      // Optional when using SHA-based selection
+  endDate?: Date        // Optional when using SHA-based selection
+  baseSha?: string      // Direct SHA for base (pre state)
+  headSha?: string      // Direct SHA for head (post state)
   customInstructions: string
 }
 
@@ -19,14 +21,18 @@ class ChangelogGenerator {
   }
 
   async generateChangelog(config: ChangelogConfig): Promise<string> {
-    const { owner, repo, startDate, endDate, customInstructions } = config;
-
-    // Get commits between dates
+    const { owner, repo, startDate, endDate, baseSha, headSha, customInstructions } = config;
+
+    // Determine base and head SHAs - use direct SHAs if provided, otherwise convert from dates
+    const base = baseSha ?? await this.getCommitFromDate(owner, repo, startDate!)
+    const head = headSha ?? await this.getCommitFromDate(owner, repo, endDate!)
+
+    // Get commits between the two points
     const commits = await this.octokit.repos.compareCommits({
       owner,
       repo,
-      base: await this.getCommitFromDate(owner, repo, startDate),
-      head: await this.getCommitFromDate(owner, repo, endDate),
+      base,
+      head,
     })
 
     // Index repository in Greptile
@@ -38,31 +44,36 @@ class ChangelogGenerator {
 
     // Check if there are any changes before making the API call
     const noChangesFound = !commits.data.files || commits.data.files.length === 0;
-
+
+    // Build version range description based on whether dates or SHAs were provided
+    const versionRange = startDate && endDate
+      ? `Time period: From ${startDate.toISOString()} to ${endDate.toISOString()}`
+      : `Commits: From ${base.substring(0, 7)} to ${head.substring(0, 7)}`;
+
     // Construct the prompt based on whether changes were found
     let prompt: string;
-    
+
     if (noChangesFound) {
       prompt = `
 Generate a changelog for the following repository: ${owner}/${repo}
-Time period: From ${startDate.toISOString()} to ${endDate.toISOString()}
+${versionRange}
 
 ${customInstructions || "Generate a user-friendly changelog in markdown format."}
 
-There are NO CHANGES found in this repository during the specified time period.
+There are NO CHANGES found in this repository during the specified version range.
 Please generate a message indicating that no changes were found.
 
 Your response should follow this format:
-${customInstructions?.includes('mintlify') 
+${customInstructions?.includes('mintlify')
   ? `<Update label="${new Date().toISOString().split('T')[0]}" description="No Changes">
-  - No code changes were found in the repository during the specified time period.
-  - This could be due to no commits being made or the selected date range not containing any activity.
+  - No code changes were found in the repository during the specified version range.
+  - This could be due to no commits being made or the selected range not containing any activity.
 </Update>`
   : `## No Changes Found
 
-- No code changes were found in the repository during the specified time period.
-- This could be due to no commits being made or the selected date range not containing any activity.
-- Try selecting a different date range or repository to view changes.
+- No code changes were found in the repository during the specified version range.
+- This could be due to no commits being made or the selected range not containing any activity.
+- Try selecting a different range or repository to view changes.
 
 *Generated on ${new Date().toLocaleString()}*`
 }
@@ -73,7 +84,7 @@ Do not include any explanations outside of this format. Only return the formatte
       // Normal case with changes
       prompt = `
 Generate a changelog for the following repository: ${owner}/${repo}
-Time period: From ${startDate.toISOString()} to ${endDate.toISOString()}
+${versionRange}
 
 ${customInstructions || "Generate a user-friendly changelog in markdown format."}