Cache changelog files

app/src/main/java/com/topjohnwu/magisk/core/Const.kt

@@ -2,6 +2,7 @@ package com.topjohnwu.magisk.core
 
 import android.os.Build
 import android.os.Process
+import com.topjohnwu.magisk.BuildConfig
 import java.io.File
 
 @Suppress("DEPRECATION")
@@ -61,6 +62,9 @@ object Const {
         const val PATREON_URL = "https://www.patreon.com/topjohnwu"
         const val SOURCE_CODE_URL = "https://github.com/topjohnwu/Magisk"
 
+        val CHANGELOG_URL = if (Version.isCanary()) Info.remote.magisk.note
+        else "https://topjohnwu.github.io/Magisk/releases/${BuildConfig.VERSION_CODE}.md"
+
         const val GITHUB_RAW_URL = "https://raw.githubusercontent.com/"
         const val GITHUB_API_URL = "https://api.github.com/"
         const val GITHUB_PAGE_URL = "https://topjohnwu.github.io/magisk_files/"

app/src/main/java/com/topjohnwu/magisk/events/dialog/ManagerInstallDialog.kt

@@ -1,18 +1,30 @@
 package com.topjohnwu.magisk.events.dialog
 
+import android.content.Context
 import com.topjohnwu.magisk.R
 import com.topjohnwu.magisk.core.Info
 import com.topjohnwu.magisk.core.download.DownloadService
 import com.topjohnwu.magisk.core.download.Subject
 import com.topjohnwu.magisk.data.repository.NetworkService
 import com.topjohnwu.magisk.view.MagiskDialog
+import org.koin.core.get
 import org.koin.core.inject
+import java.io.File
 
 class ManagerInstallDialog : MarkDownDialog() {
 
     private val svc: NetworkService by inject()
 
-    override suspend fun getMarkdownText() = svc.fetchString(Info.remote.magisk.note)
+    override suspend fun getMarkdownText(): String {
+        val text = svc.fetchString(Info.remote.magisk.note)
+        // Cache the changelog
+        val context = get<Context>()
+        context.cacheDir.listFiles { _, name -> name.endsWith(".md") }.orEmpty().forEach {
+            it.delete()
+        }
+        File(context.cacheDir, "${Info.remote.magisk.versionCode}.md").writeText(text)
+        return text
+    }
 
     override fun build(dialog: MagiskDialog) {
         super.build(dialog)

app/src/main/java/com/topjohnwu/magisk/ui/install/InstallViewModel.kt

@@ -1,12 +1,15 @@
 package com.topjohnwu.magisk.ui.install
 
 import android.app.Activity
+import android.content.Context
 import android.net.Uri
 import androidx.databinding.Bindable
 import androidx.lifecycle.viewModelScope
 import com.topjohnwu.magisk.BR
+import com.topjohnwu.magisk.BuildConfig
 import com.topjohnwu.magisk.R
 import com.topjohnwu.magisk.arch.BaseViewModel
+import com.topjohnwu.magisk.core.Const
 import com.topjohnwu.magisk.core.Info
 import com.topjohnwu.magisk.data.repository.NetworkService
 import com.topjohnwu.magisk.events.MagiskInstallFileEvent
@@ -15,7 +18,9 @@ import com.topjohnwu.magisk.ui.flash.FlashFragment
 import com.topjohnwu.magisk.utils.set
 import com.topjohnwu.superuser.Shell
 import kotlinx.coroutines.launch
+import org.koin.core.get
 import timber.log.Timber
+import java.io.File
 import java.io.IOException
 
 class InstallViewModel(
@@ -60,7 +65,16 @@ class InstallViewModel(
     init {
         viewModelScope.launch {
             try {
-                notes = svc.fetchString(Info.remote.magisk.note)
+                val context = get<Context>()
+                File(context.cacheDir, "${BuildConfig.VERSION_CODE}.md").run {
+                    notes = if (exists())
+                        readText()
+                    else {
+                        val text = svc.fetchString(Const.Url.CHANGELOG_URL)
+                        writeText(text)
+                        text
+                    }
+                }
             } catch (e: IOException) {
                 Timber.e(e)
             }

app/src/main/res/layout/fragment_install_md2.xml

@@ -214,6 +214,7 @@
 
             <com.google.android.material.card.MaterialCardView
                 style="@style/WidgetFoundation.Card"
+                gone="@{viewModel.notes.empty}"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="@dimen/l1"