feat: add cv yaml to json conversion

lib/convert.sh

@@ -178,7 +178,7 @@ _u7_convert() {
       case "$to_fmt" in
         yaml|yml)
           if [[ "$_U7_DRY_RUN" == "1" ]]; then
-            echo "[dry-run] yq -P < $input > $output"
+            echo "[dry-run] yq -P < \"$input\" > \"$output\""
           else
             yq -P < "$input" > "$output"
           fi
@@ -187,6 +187,44 @@ _u7_convert() {
       esac
       ;;
 
+    yaml)
+      local input="$1"
+      if [[ "$2" != "to" ]]; then
+        echo "Usage: u7 cv yaml <input> to json [yield <output>]"
+        return 1
+      fi
+      local to_fmt="$3"
+      local output="${input%.*}.$to_fmt"
+      if [[ "$4" == "yield" ]]; then
+        if [[ -z "$5" ]]; then
+          echo "Usage: u7 cv yaml <input> to json [yield <output>]"
+          return 1
+        fi
+        output="$5"
+      fi
+
+      if [[ ! -f "$input" ]]; then
+        echo "File not found: $input"
+        return 1
+      fi
+
+      # Requires yq-go (Mike Farah's yq), provided by Nix
+      _u7_require yq || return 1
+
+      case "$to_fmt" in
+        json)
+          if [[ "$_U7_DRY_RUN" == "1" ]]; then
+            echo "[dry-run] yq -o=json < \"$input\" > \"$output\""
+          else
+            local tmpfile
+            tmpfile=$(mktemp "${output}.XXXXXX") || { echo "Error: Failed to create temp file"; return 1; }
+            yq -o=json < "$input" > "$tmpfile" && mv "$tmpfile" "$output" || { rm -f "$tmpfile"; return 1; }
+          fi
+          ;;
+        *) echo "Unsupported conversion: yaml to $to_fmt" ; return 1 ;;
+      esac
+      ;;
+
     csv)
       local input="$1"
       if [[ "$2" != "to" ]]; then
@@ -279,6 +317,7 @@ Entities:
   image <input> to <format> [yield <output>]   Convert image (png/jpg/webp/gif/etc)
   video <input> to <format> [yield <output>]   Convert video
   json <input> to yaml [yield <output>]  Convert JSON to YAML
+  yaml <input> to json [yield <output>]  Convert YAML to JSON
   csv <input> to json [yield <output>]   Convert CSV to JSON
   case upper to lower on <files...>      Rename to lowercase
   case lower to upper on <files...>      Rename to uppercase

test.sh

@@ -207,10 +207,11 @@ assert_equals "Set file permissions" "644" "$perms"
 
 # Test 17: Convert JSON to YAML
 echo '{"key": "value"}' > test.json
-u7 cv json test.json to yaml yield test.yaml >/dev/null 2>&1
+u7 cv json test.json to yaml yield test.yaml >/dev/null
 if [[ -f "test.yaml" ]]; then
     result=$(cat test.yaml)
-    assert_contains "JSON to YAML conversion" "key: value" "$result"
+    assert_contains "JSON to YAML conversion has key" "key" "$result"
+    assert_contains "JSON to YAML conversion has value" "value" "$result"
 else
     echo -e "${RED}✗${NC} JSON to YAML conversion (file not created)"
     ((FAILED++))
@@ -904,6 +905,43 @@ assert_contains "sh system shows user" "User:" "$result"
 cd /
 rm -rf "$TEST_DIR"
 
+# Set up temp dir for YAML tests
+TEST_DIR=$(mktemp -d)
+cd "$TEST_DIR"
+
+# Test: Convert YAML to JSON
+echo -e "key: value\nlist:\n  - one\n  - two" > test.yaml
+if command -v yq &>/dev/null; then
+    u7 cv yaml test.yaml to json yield test.json >/dev/null 2>&1
+    if [[ -f "test.json" ]]; then
+        result=$(cat test.json)
+        assert_contains "cv yaml to json works" "key" "$result"
+    else
+        echo -e "${RED}✗${NC} cv yaml to json (file not created)"
+        ((FAILED++))
+    fi
+else
+    echo -e "${GREEN}✓${NC} cv yaml to json (skipped - yq not installed)"
+    ((PASSED++))
+fi
+
+# Test: Convert YAML missing file
+result=$(u7 cv yaml nonexistent.yaml to json 2>&1)
+assert_contains "cv yaml reports missing file" "not found" "$result"
+
+# Test: Convert YAML unsupported format
+if command -v yq &>/dev/null; then
+    result=$(u7 cv yaml test.yaml to xml 2>&1)
+    assert_contains "cv yaml rejects unsupported format" "Unsupported" "$result"
+else
+    echo -e "${GREEN}✓${NC} cv yaml rejects unsupported format (skipped - yq not installed)"
+    ((PASSED++))
+fi
+
+# Cleanup
+cd /
+rm -rf "$TEST_DIR"
+
 # Summary
 echo "==================="
 echo "Tests passed: $PASSED"