2 files changed, 107 insertions, 0 deletions
diff --git a/libs/utils/src/main/java/org/the_jk/cleversync/PathUtils.kt b/libs/utils/src/main/java/org/the_jk/cleversync/PathUtils.kt
new file mode 100644
index 0000000..4202b24
--- /dev/null
+++ b/libs/utils/src/main/java/org/the_jk/cleversync/PathUtils.kt
@@ -0,0 +1,49 @@
+package org.the_jk.cleversync
+
+object PathUtils {
+    fun dirname(path: String): String {
+        if (path.isEmpty()) return "."
+        var start = path.lastIndex
+        while (start > -1 && path[start] == '/') start--
+        if (start == -1) return "/"
+        val index = path.lastIndexOf('/', startIndex = start)
+        if (index == 0) return "/"
+        if (index > -1) return path.substring(0, index)
+        return "."
+    }
+
+    fun basename(path: String): String {
+        if (path.isEmpty()) return ""
+        var start = path.lastIndex
+        while (start > -1 && path[start] == '/') start--
+        if (start == -1) return "/"
+        val index = path.lastIndexOf('/', startIndex = start)
+        return path.substring(index + 1, start + 1)
+    }
+
+    fun join(path1: String, path2: String): String {
+        if (path1.isEmpty() || path2.startsWith("/")) return path2
+        if (path2.isEmpty()) return path1
+        return if (path1.endsWith("/")) path1 + path2 else "${path1}/${path2}"
+    }
+
+    fun resolve(path: String): String {
+        if (path.isEmpty()) return ""
+        val prefixed = path.startsWith("/")
+        val parts = path.split('/').filter { part ->
+            part.isNotEmpty() && part != "."
+        }.toMutableList()
+        var i = 0
+        while (i < parts.size) {
+            if (parts[i] == "..") {
+                parts.removeAt(i)
+                if (i > 0) {
+                    parts.removeAt(i - 1)
+                }
+            } else {
+                i++
+            }
+        }
+        return parts.joinToString("/", prefix = if (prefixed) "/" else "")
+    }
+}
diff --git a/libs/utils/src/test/java/org/the_jk/cleversync/PathUtilsTest.kt b/libs/utils/src/test/java/org/the_jk/cleversync/PathUtilsTest.kt
new file mode 100644
index 0000000..eb1d63f
--- /dev/null
+++ b/libs/utils/src/test/java/org/the_jk/cleversync/PathUtilsTest.kt
@@ -0,0 +1,58 @@
+package org.the_jk.cleversync
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+
+class PathUtilsTest {
+    @Test
+    fun dirname() {
+        assertThat(PathUtils.dirname("")).isEqualTo(".")
+        assertThat(PathUtils.dirname("foo")).isEqualTo(".")
+        assertThat(PathUtils.dirname("foo/")).isEqualTo(".")
+        assertThat(PathUtils.dirname("foo/bar")).isEqualTo("foo")
+        assertThat(PathUtils.dirname("/")).isEqualTo("/")
+        assertThat(PathUtils.dirname("//")).isEqualTo("/")
+        assertThat(PathUtils.dirname("/foo")).isEqualTo("/")
+        assertThat(PathUtils.dirname("/foo/")).isEqualTo("/")
+    }
+
+    @Test
+    fun basename() {
+        assertThat(PathUtils.basename("")).isEmpty()
+        assertThat(PathUtils.basename("foo")).isEqualTo("foo")
+        assertThat(PathUtils.basename("foo/")).isEqualTo("foo")
+        assertThat(PathUtils.basename("foo/bar")).isEqualTo("bar")
+        assertThat(PathUtils.basename("/")).isEqualTo("/")
+        assertThat(PathUtils.basename("//")).isEqualTo("/")
+        assertThat(PathUtils.basename("/foo")).isEqualTo("foo")
+        assertThat(PathUtils.basename("/foo/")).isEqualTo("foo")
+    }
+
+    @Test
+    fun join() {
+        assertThat(PathUtils.join("", "")).isEmpty()
+        assertThat(PathUtils.join("/", "")).isEqualTo("/")
+        assertThat(PathUtils.join("", "/")).isEqualTo("/")
+        assertThat(PathUtils.join("/", "/")).isEqualTo("/")
+        assertThat(PathUtils.join("foo", "bar")).isEqualTo("foo/bar")
+        assertThat(PathUtils.join("foo/", "bar")).isEqualTo("foo/bar")
+        assertThat(PathUtils.join("foo", "/bar")).isEqualTo("/bar")
+        assertThat(PathUtils.join("/foo", "/bar")).isEqualTo("/bar")
+        assertThat(PathUtils.join("/foo", "bar/")).isEqualTo("/foo/bar/")
+        assertThat(PathUtils.join("/foo/", "bar/")).isEqualTo("/foo/bar/")
+    }
+
+    @Test
+    fun resolve() {
+        assertThat(PathUtils.resolve("")).isEmpty()
+        assertThat(PathUtils.resolve("/")).isEqualTo("/")
+        assertThat(PathUtils.resolve("../foo")).isEqualTo("foo")
+        assertThat(PathUtils.resolve("/../foo")).isEqualTo("/foo")
+        assertThat(PathUtils.resolve("foo/../bar")).isEqualTo("bar")
+        assertThat(PathUtils.resolve("/foo/../bar")).isEqualTo("/bar")
+        assertThat(PathUtils.resolve("foo/./bar")).isEqualTo("foo/bar")
+        assertThat(PathUtils.resolve("/foo/./bar")).isEqualTo("/foo/bar")
+        assertThat(PathUtils.resolve("foo/../../../bar/")).isEqualTo("bar")
+        assertThat(PathUtils.resolve("/foo/../../../bar/")).isEqualTo("/bar")
+    }
+}