Allow to specify maximum string length

PasteIntoFile/Dialog.cs

@@ -181,13 +181,13 @@ private void updateUiFromSettings() {
         }
 
         public static string formatFilenameTemplate(string template, DateTime timestamp, int count, string textcontent) {
-            return string.Format(template, timestamp, count, textcontent);
+            return string.Format(new CustomFormatProvider(), template, timestamp, count, textcontent);
         }
         public static string formatFilenameTemplate(string template, ClipboardContents contents, int count) {
             var text = contents.Contents.OfType<TextContent>().FirstOrDefault()?.Text;
             if (text != null) {
                 text = text.Trim().Split('\n').First().Trim(); // only first non-empty line
-                text = text.Substring(0, Math.Min(text.Length, 64)); // limit to 64 characters
+                text = text.Substring(0, Math.Min(text.Length, 256)); // limit to 256 characters
                 text = Path.GetInvalidFileNameChars().Aggregate(text, (str, c) => str.Replace(c, '_')); // replace invalid chars
             }
             return formatFilenameTemplate(template, contents.Timestamp, count, text);

PasteIntoFile/Main.cs

@@ -520,4 +520,30 @@ public static async Task<bool> CheckForUpdates() {
         private const int ATTACH_PARENT_PROCESS = -1;
 
     }
+
+
+    /// <summary>
+    /// A custom format provider that allows to
+    /// - For strings, specify the maximum length, e.g. "{0:15}" for max 15 characters
+    /// </summary>
+    public class CustomFormatProvider : IFormatProvider, ICustomFormatter {
+
+        public object GetFormat(Type formatType) {
+            return formatType == typeof(ICustomFormatter) ? this : null;
+        }
+
+        public string Format(string format, object arg, IFormatProvider formatProvider) {
+            // strings
+            if (arg is string str && !string.IsNullOrEmpty(format)) {
+                if (int.TryParse(format, out var length) && length > 0) {
+                    return str.Substring(0, Math.Min(str.Length, length));
+                }
+                throw new FormatException("Invalid format string '" + format + "'. Expected a positive integer specifying maximum length.");
+            }
+            // default formatting
+            return string.Format("{0:" + format + "}", arg);
+        }
+
+    }
+
 }

PasteIntoFile/Properties/Resources.de.resx

@@ -177,9 +177,6 @@ Tooltip</comment>
   	{2}  	Text in der Zwischenablage
 Für Details zur Formatierung &lt;a&gt;hier klicken&lt;/a&gt;.</value>
   </data>
-  <data name="str_template_edit_info_url" xml:space="preserve">
-    <value>https://docs.microsoft.com/de-de/dotnet/standard/base-types/custom-date-and-time-format-strings</value>
-  </data>
   <data name="str_filename_template" xml:space="preserve">
     <value>Dateinamen-Vorlage</value>
   </data>

PasteIntoFile/Properties/Resources.it.resx

@@ -177,9 +177,6 @@ Vuoi sovrascriverlo?</value>
   {1} - Salva conteggio in modalità batch
 Per i dettagli sugli specificatori di formato &lt;a&gt;clicca qui&lt;/a&gt;.</value>
   </data>
-  <data name="str_template_edit_info_url" xml:space="preserve">
-    <value>https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings</value>
-  </data>
   <data name="str_filename_template" xml:space="preserve">
     <value>Modello nome file</value>
   </data>

PasteIntoFile/Properties/Resources.ko.resx

@@ -176,9 +176,6 @@ Tooltip</comment>
   {1} - 저장 횟수 (배치 모드)
 서식 지정자에 대한 자세한 내용은 &lt;a&gt;링크를 참고하세요&lt;/a&gt;.</value>
   </data>
-  <data name="str_template_edit_info_url" xml:space="preserve">
-    <value>https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings</value>
-  </data>
   <data name="str_filename_template" xml:space="preserve">
     <value>파일명 템플릿</value>
   </data>

PasteIntoFile/Properties/Resources.resx

@@ -187,7 +187,7 @@ Do you want to overwrite it?</value>
 For details on the format specifiers &lt;a&gt;click here&lt;/a&gt;.</value>
   </data>
   <data name="str_template_edit_info_url" xml:space="preserve">
-    <value>https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings</value>
+    <value>https://github.com/eltos/PasteIntoFile#template-format</value>
   </data>
   <data name="str_filename_template" xml:space="preserve">
     <value>Filename template</value>

PasteIntoFile/Properties/Resources.uk-UA.resx

@@ -143,9 +143,6 @@ Tooltip</comment>
   {1} - Збереження кількості у пакетному режимі
 Детальніше про специфікатори форматування &lt;a&gt;натисніть тут&lt;/a&gt;.</value>
   </data>
-  <data name="str_template_edit_info_url" xml:space="preserve">
-    <value>https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings</value>
-  </data>
   <data name="str_filename_template" xml:space="preserve">
     <value>Шаблон імені файлу</value>
   </data>

PasteIntoFile/TemplateEdit.cs

@@ -29,7 +29,7 @@ public TemplateEdit() {
                 "{0:yyyyMMdd_HHmmss}",
                 "{0:yyyy-MM-dd}_{1:000}",
                 "PasteIntoFile_{1:000}_{0:fffffff}",
-                "{2}",
+                "{2:10}",
             });
             textTemplate.Text = Settings.Default.filenameTemplate;
 

README.md

@@ -84,9 +84,9 @@ Otherwise, a dialog will prompt for filename and type.
 By holding `SHIFT` when the program starts, the autosave mode setting can be temporarily inverted (show the dialog even though autosave is enabled, or skip the dialog even though autosave is disabled).
 When running Paste Into File from the start menu or tray, the dialog will always be shown.
 
-The **filename template** can be edited from the dialog or via command line.
+The **filename template** can be edited from the dialog or via command line (see [below](#template-format) for a description of the available formats).
 When holding `CTRL` while the program starts, the file will be saved to a subdirectory.
-The corresponding template can be configured via command line.
+The corresponding template can be configured via command line (see below).
 
 The available **file extensions** depend on the formats available in the clipboard.
 For example, if you copy a range of cells from a spreadsheet, the data is available not only as text, but also in DIF, RTF, SLK and HTML formats and even as screenshot.
@@ -117,6 +117,15 @@ Currently, image and text files are supported. If the file format is not underst
 For non-text files, the file path is copied as text in addition to the image contents and file.
 
 
+<a id="template-format"></a>
+### Filename template format
+The filename and/or subfolder template string may contain the following placeholders:
+- `{0}`: The current date and time.
+    The format can be specified, e.g. `{0:yyyy-MM-dd HH-mm-ss}`, see [format specifiers](https://docs.microsoft.com/en-us/dotnet/standard/base-types/custom-date-and-time-format-strings) for details.
+- `{1}`: A counter for batch mode.
+    The format can be specified, e.g. `{1:000}` for zero padding, see [format specifiers](https://learn.microsoft.com/en-us/dotnet/standard/base-types/custom-numeric-format-strings) for details.
+- `{2}`: The clipboard text.
+    The format can be specified, e.g. `{2:15}` to limit it to 15 characters.
 
 ### Command Line