Merge branch 'main' into add-solution-30-task-scheduler

Author: sidharth-chauhan

.github/workflows/release.yml

@@ -73,27 +73,35 @@ jobs:
           echo "next=$next" >> $GITHUB_OUTPUT
 
       - name: Create tag and release
+        id: create_release
         env:
           GITHUB_TOKEN: ${{ secrets.PAT_TOKEN || secrets.GITHUB_TOKEN }}
           GH_TOKEN: ${{ secrets.PAT_TOKEN || secrets.GITHUB_TOKEN }}
         run: |
           next="${{ steps.next.outputs.next }}"
           echo "Creating release: $next"
           
-          # Create and push tag
-          git tag "$next"
-          git push origin "$next"
+          # Check if tag already exists
+          if git rev-parse "$next" >/dev/null 2>&1; then
+            echo "Tag $next already exists, skipping tag creation"
+          else
+            # Create and push tag
+            git tag "$next"
+            git push origin "$next"
+          fi
           
           # Create release with proper error handling
-          if gh release create "$next" --generate-notes; then
+          if gh release view "$next" >/dev/null 2>&1; then
+            echo "Release $next already exists, will update it"
+          elif gh release create "$next" --generate-notes; then
             echo "Release $next created successfully"
           else
-            echo "Failed to create release $next, but continuing..."
+            echo "Failed to create release $next"
             exit 1
           fi
 
       - name: Attach binaries (Linux/macOS)
-        if: success()
+        if: steps.create_release.outcome == 'success'
         env:
           GITHUB_TOKEN: ${{ secrets.PAT_TOKEN || secrets.GITHUB_TOKEN }}
           GH_TOKEN: ${{ secrets.PAT_TOKEN || secrets.GITHUB_TOKEN }}
@@ -103,16 +111,31 @@ jobs:
           
           # Build static binaries for common platforms
           mkdir -p dist
+          echo "Building binaries..."
           GOOS=linux GOARCH=amd64 go build -o dist/golearn-linux-amd64 ./cmd/golearn
           GOOS=darwin GOARCH=arm64 go build -o dist/golearn-darwin-arm64 ./cmd/golearn
           GOOS=darwin GOARCH=amd64 go build -o dist/golearn-darwin-amd64 ./cmd/golearn
           GOOS=windows GOARCH=amd64 go build -o dist/golearn-windows-amd64.exe ./cmd/golearn
           
-          # Upload binaries to the release
-          if gh release upload "$next" dist/* --clobber; then
-            echo "Binaries uploaded successfully"
-          else
-            echo "Failed to upload binaries"
-            exit 1
-          fi
+          echo "Binaries built successfully:"
+          ls -lh dist/
+          
+          # Upload binaries to the release with retry logic
+          max_attempts=3
+          attempt=1
+          while [ $attempt -le $max_attempts ]; do
+            echo "Attempt $attempt of $max_attempts to upload binaries..."
+            if gh release upload "$next" dist/* --clobber; then
+              echo "Binaries uploaded successfully"
+              exit 0
+            else
+              echo "Upload attempt $attempt failed"
+              if [ $attempt -eq $max_attempts ]; then
+                echo "Failed to upload binaries after $max_attempts attempts"
+                exit 1
+              fi
+              attempt=$((attempt+1))
+              sleep 2
+            fi
+          done
 

.gitignore

@@ -7,6 +7,7 @@
 *.dll
 *.so
 *.dylib
+golearn
 
 # Test binary, built with `go test -c`
 *.test

internal/exercises/catalog.yaml

@@ -134,6 +134,55 @@ concepts:
   test_regex: ".*"
   hints:
     - Define a custom error type and return it from a function.
+- slug: 28_defer
+  title: Defer
+  test_regex: ".*"
+  hints:
+    - Use `f.Close()` with `defer` keyword.
+- slug: 29_go_routines
+  title: Go Routines
+  test_regex: ".*"
+  hints:
+    - Use `go` keyword to execute functions concurrently using go routines.
+- slug: 30_channels
+  title: Channels
+  test_regex: ".*"
+  hints:
+    - Use `make(chan T)` to create a channel and `<-` to send and receive on it.
+- slug: 31_mutexes
+  title: Mutexes
+  test_regex: ".*"
+  hints:
+    - Use `sync.Mutex` to synchronize access to a shared resource.
+- slug: 32_sorting
+  title: Sorting
+  test_regex: ".*"
+  hints:
+    - Use `slice.Sort` for sorting slices.
+- slug: 33_string_formatting
+  title: String Formatting
+  test_regex: ".*"
+  hints:
+    - Use `fmt.Sprintf` and `%s`, `%d`, `%f` formatting directives to format strings, integers, and floats.
+- slug: 34_channel_buffering
+  title: Channel Buffering
+  test_regex: ".*"
+  hints:
+    - Use `make(chan T, N)` to create a buffered channel and `<-` to send and receive on it.
+- slug: 39_channel_directions
+  title: Channel Directions
+  test_regex: ".*"
+  hints:
+    - Create two channels, one for sending jobs and one for receiving results.
+    - Start 5 workers using go routines.
+    - Send 50 jobs to the worker pool.
+    - Receive results from the worker pool and store them in a `rs` slice.
+    - Enforce type safety by specifying the channel directions in worker function.
+- slug: 35_channel_sync
+  title: Channel Synchronization
+  test_regex: ".*"
+  hints:
+    - Use a buffered boolean channel and wait till go routine completes.
 - slug: 37_xml
   title: XML Encoding and Decoding
   test_regex: ".*"
@@ -142,7 +191,12 @@ concepts:
     - Add XML struct tags using `xml:"fieldname"` to map struct fields to XML elements.
     - Use xml.Marshal to convert structs to XML bytes.
     - Use xml.Unmarshal to parse XML bytes into structs.
-
+- slug: 40_channel_select
+  title: Channel Select
+  test_regex: ".*"
+  hints:
+    - Use `select` to handle multiple channel operations concurrently.
+    - Use `time.After` to simulate a 5 microsecond timeout.
 projects:
 - slug: 101_text_analyzer
   title: Text Analyzer (Easy)

internal/exercises/solutions.go

@@ -11,7 +11,7 @@ import (
 
 // Embed the canonical solutions alongside templates. We do not expose these via CLI directly.
 //
-//go:embed solutions/**
+//go:embed all:solutions/**
 var solutionsFS embed.FS
 
 // SolutionExists reports whether we have an embedded solution for the given slug.

internal/exercises/solutions/02_values/.gitkeep

@@ -0,0 +1,10 @@
+package forloop
+
+// SumTo returns the sum of all integers from 1 to n.
+func SumTo(n int) int {
+	sum := 0
+	for i := 1; i <= n; i++ {
+		sum += i
+	}
+	return sum
+}

internal/exercises/solutions/03_variables/.gitkeep

@@ -0,0 +1,12 @@
+package ifelse
+
+// Sign returns "negative", "zero", or "positive" based on n
+func Sign(n int) string {
+	if n < 0 {
+		return "negative"
+	} else if n == 0 {
+		return "zero"
+	} else {
+		return "positive"
+	}
+}

internal/exercises/solutions/04_constants/.gitkeep

@@ -0,0 +1,10 @@
+package sw
+
+// IsWeekend returns true if day is weekend ("sat" or "sun"), false otherwise
+func IsWeekend(day string) bool {
+	switch day {
+	case "sat", "sun":
+		return true
+	}
+	return false
+}