PasswordBuilder: use runCatching to replace exception handling

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/com/zeapo/pwdstore/pwgenxkpwd/PasswordBuilder.kt

@@ -5,12 +5,13 @@
 package com.zeapo.pwdstore.pwgenxkpwd
 
 import android.content.Context
+import com.github.michaelbull.result.Result
+import com.github.michaelbull.result.runCatching
 import com.zeapo.pwdstore.R
 import com.zeapo.pwdstore.pwgen.PasswordGenerator.PasswordGeneratorException
 import com.zeapo.pwdstore.pwgen.secureRandomCharacter
 import com.zeapo.pwdstore.pwgen.secureRandomElement
 import com.zeapo.pwdstore.pwgen.secureRandomNumber
-import java.io.IOException
 import java.util.Locale
 
 class PasswordBuilder(ctx: Context) {
@@ -83,8 +84,7 @@ class PasswordBuilder(ctx: Context) {
     }
 
     @OptIn(ExperimentalStdlibApi::class)
-    @Throws(PasswordGeneratorException::class)
+    fun create(): Result<String, Throwable> {
-    fun create(): String {
         val wordBank = mutableListOf<String>()
         val password = StringBuilder()
 
@@ -94,7 +94,7 @@ class PasswordBuilder(ctx: Context) {
                 password.append(separator)
             }
         }
-        try {
+        return runCatching {
             val dictionary = XkpwdDictionary(context)
             val words = dictionary.words
             for (wordLength in minWordLength..maxWordLength) {
@@ -119,9 +119,6 @@ class PasswordBuilder(ctx: Context) {
                     password.append(separator)
                 }
             }
-        } catch (e: IOException) {
-            throw PasswordGeneratorException("Failed generating password!")
-        }
             if (numDigits != 0) {
                 if (isAppendNumberSeparator) {
                     password.append(separator)
@@ -134,7 +131,8 @@ class PasswordBuilder(ctx: Context) {
                 }
                 password.append(generateRandomSymbolSequence(numSymbols))
             }
-        return password.toString()
+            password.toString()
+        }
     }
 
     companion object {

app/src/main/java/com/zeapo/pwdstore/ui/dialogs/XkPasswordGeneratorDialogFragment.kt

@@ -16,12 +16,15 @@ import androidx.appcompat.widget.AppCompatTextView
 import androidx.core.content.edit
 import androidx.fragment.app.DialogFragment
 import com.github.ajalt.timberkt.Timber.tag
+import com.github.michaelbull.result.fold
+import com.github.michaelbull.result.getOr
+import com.github.michaelbull.result.runCatching
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.zeapo.pwdstore.R
 import com.zeapo.pwdstore.databinding.FragmentXkpwgenBinding
-import com.zeapo.pwdstore.pwgen.PasswordGenerator
 import com.zeapo.pwdstore.pwgenxkpwd.CapsType
 import com.zeapo.pwdstore.pwgenxkpwd.PasswordBuilder
+import com.zeapo.pwdstore.utils.getString
 
 /** A placeholder fragment containing a simple view.  */
 class XkPasswordGeneratorDialogFragment : DialogFragment() {
@@ -41,19 +44,13 @@ class XkPasswordGeneratorDialogFragment : DialogFragment() {
 
         prefs = callingActivity.getSharedPreferences("PasswordGenerator", Context.MODE_PRIVATE)
 
-        val previousStoredCapStyle: String = try {
+        val previousStoredCapStyle: String = runCatching {
-            prefs.getString(PREF_KEY_CAPITALS_STYLE, DEFAULT_CAPS_STYLE)!!
+            prefs.getString(PREF_KEY_CAPITALS_STYLE)!!
-        } catch (e: Exception) {
+        }.getOr(DEFAULT_CAPS_STYLE)
-            tag("xkpw").e(e)
-            DEFAULT_CAPS_STYLE
-        }
 
-        val lastCapitalsStyleIndex: Int = try {
+        val lastCapitalsStyleIndex: Int = runCatching {
             CapsType.valueOf(previousStoredCapStyle).ordinal
-        } catch (e: Exception) {
+        }.getOr(DEFAULT_CAPS_INDEX)
-            tag("xkpw").e(e)
-            DEFAULT_CAPS_INDEX
-        }
         binding.xkCapType.setSelection(lastCapitalsStyleIndex)
         binding.xkNumWords.setText(prefs.getString(PREF_KEY_NUM_WORDS, DEFAULT_NUMBER_OF_WORDS))
 
@@ -87,8 +84,7 @@ class XkPasswordGeneratorDialogFragment : DialogFragment() {
     }
 
     private fun makeAndSetPassword(passwordText: AppCompatTextView) {
-        try {
+        PasswordBuilder(requireContext())
-            passwordText.text = PasswordBuilder(requireContext())
             .setNumberOfWords(Integer.valueOf(binding.xkNumWords.text.toString()))
             .setMinimumWordLength(DEFAULT_MIN_WORD_LENGTH)
             .setMaximumWordLength(DEFAULT_MAX_WORD_LENGTH)
@@ -96,11 +92,14 @@ class XkPasswordGeneratorDialogFragment : DialogFragment() {
             .appendNumbers(binding.xkNumberSymbolMask.text!!.count { c -> c == EXTRA_CHAR_PLACEHOLDER_DIGIT })
             .appendSymbols(binding.xkNumberSymbolMask.text!!.count { c -> c == EXTRA_CHAR_PLACEHOLDER_SYMBOL })
             .setCapitalization(CapsType.valueOf(binding.xkCapType.selectedItem.toString())).create()
-        } catch (e: PasswordGenerator.PasswordGeneratorException) {
+            .fold(
+                success = { passwordText.text = it },
+                failure = { e ->
                     Toast.makeText(requireActivity(), e.message, Toast.LENGTH_SHORT).show()
                     tag("xkpw").e(e, "failure generating xkpasswd")
                     passwordText.text = FALLBACK_ERROR_PASS
-        }
+                },
+            )
     }
 
     private fun setPreferences() {