class-version.sh: make detection more robust

ctrueden · ctrueden · commit 22a568f2c1a0 · 2023-03-02T15:21:28.000-06:00
If a class lives in META-INF/versions/ we can ignore it because it's
specially targeting a different version of Java than other classes. If
a module-info.class is present, we can ignore it because it must target
Java 9 or newer even if the other classes target an earlier version.
diff --git a/class-version.sh b/class-version.sh
@@ -49,7 +49,11 @@ class_version() {
 }
 
 first_class() {
-  jar tf "$1" | grep '\.class$' | head -n 1
+  jar tf "$1" |
+    grep '\.class$' |
+    grep -v '^META-INF/' |
+    grep -v 'module-info\.class' |
+    head -n 1
 }
 
 for file in "$@"

Original file line number	Diff line number	Diff line change
`@@ -49,7 +49,11 @@ class_version() {`
`49`	`49`	`}`
`50`	`50`
`51`	`51`	`first_class() {`
`52`		`- jar tf "$1" \| grep '\.class$' \| head -n 1`
	`52`	`+ jar tf "$1" \|`
	`53`	`+ grep '\.class$' \|`
	`54`	`+ grep -v '^META-INF/' \|`
	`55`	`+ grep -v 'module-info\.class' \|`
	`56`	`+ head -n 1`
`53`	`57`	`}`
`54`	`58`
`55`	`59`	`for file in "$@"`