fix(report): hide empty tables if all vulns has been filtered

pkg/report/table/vulnerability.go

@@ -52,10 +52,16 @@ func NewVulnerabilityRenderer(result types.Result, isTerminal, tree, suppressed
 }
 
 func (r *vulnerabilityRenderer) Render() string {
-	r.renderDetectedVulnerabilities()
-
-	if r.tree {
-		r.renderDependencyTree()
+	// There are 3 cases when we show the vulnerability table (or only target and `Total: 0...`):
+	// When Result contains vulnerabilities;
+	// When Result target is OS packages even if no vulnerabilities are found;
+	// When we show non-empty `Suppressed Vulnerabilities` table.
+	if len(r.result.Vulnerabilities) > 0 || r.result.Class == types.ClassOSPkg || (r.showSuppressed && len(r.result.ModifiedFindings) > 0) {
+		r.renderDetectedVulnerabilities()
+
+		if r.tree {
+			r.renderDependencyTree()
+		}
 	}
 
 	if r.showSuppressed {

pkg/report/table/vulnerability_test.go

@@ -396,6 +396,111 @@ Suppressed Vulnerabilities (Total: 1)
 ├─────────┼───────────────┼──────────┼─────────┼─────────────────┼───────────────────┤
 │ bar     │ CVE-2020-0002 │ MEDIUM   │ ignored │ Not exploitable │ .trivyignore.yaml │
 └─────────┴───────────────┴──────────┴─────────┴─────────────────┴───────────────────┘
+`,
+		},
+		{
+			name: "suppressed all OS package vulnerabilities without `showSuppressed` flag",
+			result: types.Result{
+				Target: "test",
+				Class:  types.ClassOSPkg,
+				Type:   ftypes.Alpine,
+				ModifiedFindings: []types.ModifiedFinding{
+					{
+						Type:      types.FindingTypeVulnerability,
+						Status:    types.FindingStatusIgnored,
+						Statement: "Not exploitable",
+						Source:    ".trivyignore.yaml",
+						Finding: types.DetectedVulnerability{
+							VulnerabilityID:  "CVE-2020-0001",
+							PkgName:          "foo",
+							InstalledVersion: "1.2.3",
+							Status:           dbTypes.StatusWillNotFix,
+							Vulnerability: dbTypes.Vulnerability{
+								Title:       "title1",
+								Description: "desc1",
+								Severity:    "MEDIUM",
+							},
+						},
+					},
+				},
+			},
+			showSuppressed: false,
+			want: `
+test
+====
+Total: 0 (MEDIUM: 0, HIGH: 0)
+
+`,
+		},
+		{
+			name: "suppressed all language package vulnerabilities without `showSuppressed` flag",
+			result: types.Result{
+				Target: "test",
+				Class:  types.ClassLangPkg,
+				Type:   ftypes.Jar,
+				ModifiedFindings: []types.ModifiedFinding{
+					{
+						Type:      types.FindingTypeVulnerability,
+						Status:    types.FindingStatusIgnored,
+						Statement: "Not exploitable",
+						Source:    ".trivyignore.yaml",
+						Finding: types.DetectedVulnerability{
+							VulnerabilityID:  "CVE-2020-0001",
+							PkgName:          "foo",
+							InstalledVersion: "1.2.3",
+							Status:           dbTypes.StatusWillNotFix,
+							Vulnerability: dbTypes.Vulnerability{
+								Title:       "title1",
+								Description: "desc1",
+								Severity:    "MEDIUM",
+							},
+						},
+					},
+				},
+			},
+			showSuppressed: false,
+			want:           ``,
+		},
+		{
+			name: "suppressed all language package vulnerabilities with `showSuppressed` flag",
+			result: types.Result{
+				Target: "test",
+				Class:  types.ClassLangPkg,
+				Type:   ftypes.Jar,
+				ModifiedFindings: []types.ModifiedFinding{
+					{
+						Type:      types.FindingTypeVulnerability,
+						Status:    types.FindingStatusIgnored,
+						Statement: "Not exploitable",
+						Source:    ".trivyignore.yaml",
+						Finding: types.DetectedVulnerability{
+							VulnerabilityID:  "CVE-2020-0001",
+							PkgName:          "foo",
+							InstalledVersion: "1.2.3",
+							Status:           dbTypes.StatusWillNotFix,
+							Vulnerability: dbTypes.Vulnerability{
+								Title:       "title1",
+								Description: "desc1",
+								Severity:    "MEDIUM",
+							},
+						},
+					},
+				},
+			},
+			showSuppressed: true,
+			want: `
+test (jar)
+==========
+Total: 0 (MEDIUM: 0, HIGH: 0)
+
+
+Suppressed Vulnerabilities (Total: 1)
+=====================================
+┌─────────┬───────────────┬──────────┬─────────┬─────────────────┬───────────────────┐
+│ Library │ Vulnerability │ Severity │ Status  │    Statement    │      Source       │
+├─────────┼───────────────┼──────────┼─────────┼─────────────────┼───────────────────┤
+│ foo     │ CVE-2020-0001 │ MEDIUM   │ ignored │ Not exploitable │ .trivyignore.yaml │
+└─────────┴───────────────┴──────────┴─────────┴─────────────────┴───────────────────┘
 `,
 		},
 	}