Regularize command-line flags.

All the notice binaries have -title

All the binaries that can -stripPrefix can strip multiple.

Bug: 68860345
Bug: 151177513
Bug: 151953481
Bug: 213388645
Bug: 210912771

Test: m all
Test: m systemlicense
Test: m bom; out/soong/host/linux-x85/bom ...
Test: m dumpgraph; out/soong/host/linux-x85/dumpgraph ...
Test: m dumpresolutions; out/soong/host/linux-x85/dumpresolutions ...
Test: m htmlnotice; out/soong/host/linux-x85/htmlnotice ...
Test: m rtrace; out/soong/host/linux-x85/rtrace ...
Test: m textnotice; out/soong/host/linux-x85/textnotice ...
Test: m xmlnotice; out/soong/host/linux-x85/xmlnotice ...

where ... is the path to the .meta_lic file for the system image. In my
case if

$ export PRODUCT=$(realpath $ANDROID_PRODUCT_OUT --relative-to=$PWD)

... can be expressed as:

${PRODUCT}/gen/META/lic_intermediates/${PRODUCT}/system.img.meta_lic

Change-Id: I08357bf1adb048abba6563cf3cea6ee6d60405e0
diff --git a/tools/compliance/cmd/dumpgraph/dumpgraph.go b/tools/compliance/cmd/dumpgraph/dumpgraph.go
index 02ab025..fa16b1b 100644
--- a/tools/compliance/cmd/dumpgraph/dumpgraph.go
+++ b/tools/compliance/cmd/dumpgraph/dumpgraph.go
@@ -29,7 +29,7 @@
 var (
 	graphViz        = flag.Bool("dot", false, "Whether to output graphviz (i.e. dot) format.")
 	labelConditions = flag.Bool("label_conditions", false, "Whether to label target nodes with conditions.")
-	stripPrefix     = flag.String("strip_prefix", "", "Prefix to remove from paths. i.e. path to root")
+	stripPrefix     = newMultiString("strip_prefix", "Prefix to remove from paths. i.e. path to root (multiple allowed)")
 
 	failNoneRequested = fmt.Errorf("\nNo license metadata files requested")
 	failNoLicenses    = fmt.Errorf("No licenses found")
@@ -38,7 +38,20 @@
 type context struct {
 	graphViz        bool
 	labelConditions bool
-	stripPrefix     string
+	stripPrefix     []string
+}
+
+func (ctx context) strip(installPath string) string {
+	for _, prefix := range ctx.stripPrefix {
+		if strings.HasPrefix(installPath, prefix) {
+			p := strings.TrimPrefix(installPath, prefix)
+			if 0 == len(p) {
+				continue
+			}
+			return p
+		}
+	}
+	return installPath
 }
 
 func init() {
@@ -60,6 +73,19 @@
 	}
 }
 
+// newMultiString creates a flag that allows multiple values in an array.
+func newMultiString(name, usage string) *multiString {
+	var f multiString
+	flag.Var(&f, name, usage)
+	return &f
+}
+
+// multiString implements the flag `Value` interface for multiple strings.
+type multiString []string
+
+func (ms *multiString) String() string     { return strings.Join(*ms, ", ") }
+func (ms *multiString) Set(s string) error { *ms = append(*ms, s); return nil }
+
 func main() {
 	flag.Parse()
 
@@ -107,7 +133,7 @@
 
 	// targetOut calculates the string to output for `target` separating conditions as needed using `sep`.
 	targetOut := func(target *compliance.TargetNode, sep string) string {
-		tOut := strings.TrimPrefix(target.Name(), ctx.stripPrefix)
+		tOut := ctx.strip(target.Name())
 		if ctx.labelConditions {
 			conditions := target.LicenseConditions().Names()
 			sort.Strings(conditions)
diff --git a/tools/compliance/cmd/dumpgraph/dumpgraph_test.go b/tools/compliance/cmd/dumpgraph/dumpgraph_test.go
index 516c1db..67b2b40 100644
--- a/tools/compliance/cmd/dumpgraph/dumpgraph_test.go
+++ b/tools/compliance/cmd/dumpgraph/dumpgraph_test.go
@@ -59,7 +59,7 @@
 			condition: "firstparty",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/firstparty/"},
+			ctx:       context{stripPrefix: []string{"testdata/firstparty/"}},
 			expectedOut: []string{
 				"bin/bin1.meta_lic lib/liba.so.meta_lic static",
 				"bin/bin1.meta_lic lib/libc.a.meta_lic static",
@@ -75,7 +75,7 @@
 			condition: "firstparty",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/firstparty/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/firstparty/"}, labelConditions: true},
 			expectedOut: []string{
 				"bin/bin1.meta_lic:notice lib/liba.so.meta_lic:notice static",
 				"bin/bin1.meta_lic:notice lib/libc.a.meta_lic:notice static",
@@ -146,7 +146,7 @@
 			condition: "notice",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/notice/"},
+			ctx:       context{stripPrefix: []string{"testdata/notice/"}},
 			expectedOut: []string{
 				"bin/bin1.meta_lic lib/liba.so.meta_lic static",
 				"bin/bin1.meta_lic lib/libc.a.meta_lic static",
@@ -162,7 +162,7 @@
 			condition: "notice",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/notice/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/notice/"}, labelConditions: true},
 			expectedOut: []string{
 				"bin/bin1.meta_lic:notice lib/liba.so.meta_lic:notice static",
 				"bin/bin1.meta_lic:notice lib/libc.a.meta_lic:notice static",
@@ -233,7 +233,7 @@
 			condition: "reciprocal",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/reciprocal/"},
+			ctx:       context{stripPrefix: []string{"testdata/reciprocal/"}},
 			expectedOut: []string{
 				"bin/bin1.meta_lic lib/liba.so.meta_lic static",
 				"bin/bin1.meta_lic lib/libc.a.meta_lic static",
@@ -249,7 +249,7 @@
 			condition: "reciprocal",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/reciprocal/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/reciprocal/"}, labelConditions: true},
 			expectedOut: []string{
 				"bin/bin1.meta_lic:notice lib/liba.so.meta_lic:reciprocal static",
 				"bin/bin1.meta_lic:notice lib/libc.a.meta_lic:reciprocal static",
@@ -320,7 +320,7 @@
 			condition: "restricted",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/restricted/"},
+			ctx:       context{stripPrefix: []string{"testdata/restricted/"}},
 			expectedOut: []string{
 				"bin/bin1.meta_lic lib/liba.so.meta_lic static",
 				"bin/bin1.meta_lic lib/libc.a.meta_lic static",
@@ -336,7 +336,7 @@
 			condition: "restricted",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/restricted/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/restricted/"}, labelConditions: true},
 			expectedOut: []string{
 				"bin/bin1.meta_lic:notice lib/liba.so.meta_lic:restricted_allows_dynamic_linking static",
 				"bin/bin1.meta_lic:notice lib/libc.a.meta_lic:reciprocal static",
@@ -407,7 +407,7 @@
 			condition: "proprietary",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/proprietary/"},
+			ctx:       context{stripPrefix: []string{"testdata/proprietary/"}},
 			expectedOut: []string{
 				"bin/bin1.meta_lic lib/liba.so.meta_lic static",
 				"bin/bin1.meta_lic lib/libc.a.meta_lic static",
@@ -423,7 +423,7 @@
 			condition: "proprietary",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/proprietary/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/proprietary/"}, labelConditions: true},
 			expectedOut: []string{
 				"bin/bin1.meta_lic:notice lib/liba.so.meta_lic:by_exception_only:proprietary static",
 				"bin/bin1.meta_lic:notice lib/libc.a.meta_lic:by_exception_only:proprietary static",
@@ -613,7 +613,7 @@
 			condition: "firstparty",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/firstparty/"},
+			ctx:       context{stripPrefix: []string{"testdata/firstparty/"}},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic"),
 				matchTarget("bin/bin2.meta_lic"),
@@ -636,7 +636,7 @@
 			condition: "firstparty",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/firstparty/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/firstparty/"}, labelConditions: true},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic", "notice"),
 				matchTarget("bin/bin2.meta_lic", "notice"),
@@ -735,7 +735,7 @@
 			condition: "notice",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/notice/"},
+			ctx:       context{stripPrefix: []string{"testdata/notice/"}},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic"),
 				matchTarget("bin/bin2.meta_lic"),
@@ -758,7 +758,7 @@
 			condition: "notice",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/notice/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/notice/"}, labelConditions: true},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic", "notice"),
 				matchTarget("bin/bin2.meta_lic", "notice"),
@@ -857,7 +857,7 @@
 			condition: "reciprocal",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/reciprocal/"},
+			ctx:       context{stripPrefix: []string{"testdata/reciprocal/"}},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic"),
 				matchTarget("bin/bin2.meta_lic"),
@@ -880,7 +880,7 @@
 			condition: "reciprocal",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/reciprocal/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/reciprocal/"}, labelConditions: true},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic", "notice"),
 				matchTarget("bin/bin2.meta_lic", "notice"),
@@ -979,7 +979,7 @@
 			condition: "restricted",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/restricted/"},
+			ctx:       context{stripPrefix: []string{"testdata/restricted/"}},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic"),
 				matchTarget("bin/bin2.meta_lic"),
@@ -1002,7 +1002,7 @@
 			condition: "restricted",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/restricted/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/restricted/"}, labelConditions: true},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic", "notice"),
 				matchTarget("bin/bin2.meta_lic", "notice"),
@@ -1101,7 +1101,7 @@
 			condition: "proprietary",
 			name:      "apex_trimmed",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/proprietary/"},
+			ctx:       context{stripPrefix: []string{"testdata/proprietary/"}},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic"),
 				matchTarget("bin/bin2.meta_lic"),
@@ -1124,7 +1124,7 @@
 			condition: "proprietary",
 			name:      "apex_trimmed_labelled",
 			roots:     []string{"highest.apex.meta_lic"},
-			ctx:       context{stripPrefix: "testdata/proprietary/", labelConditions: true},
+			ctx:       context{stripPrefix: []string{"testdata/proprietary/"}, labelConditions: true},
 			expectedOut: []getMatcher{
 				matchTarget("bin/bin1.meta_lic", "notice"),
 				matchTarget("bin/bin2.meta_lic", "by_exception_only", "proprietary"),