Apply indent conversion to whole document if no text selected (#533)

CHANGELOG.md

@@ -23,7 +23,11 @@ develop
     - Fix an issue where font-size changing could remove hanging indent. 
     - Fix an issue where layout of split editors will be broken if the font of one of the other split editors is changed.
 - Add “Copy as Rich Text” action to the contextual menu.
-- Apply “Sort”, “Reverse” or “Delete Duplicates” actions for text lines to whole document if no text is selected. 
+- Apply the following text actions to whole document if no text is selected:
+    - Indentation > Convert Indentation to Tab / Spaces
+    - Lines > Sort
+    - Lines > Reverse
+    - Lines > Delete Duplicates
 - Improve recovering status of unsaved documents on window resume.
 - Improve line number view drawing with selection on vertical text mode.
 - Improve invisibles drawing:

CotEditor/Sources/CETextView+Indentation.m

@@ -165,9 +165,14 @@
 - (IBAction)convertIndentationToSpaces:(nullable id)sender
 // ------------------------------------------------------
 {
-    if ([self selectedRange].length == 0) { return; }
+    NSArray<NSValue *> *ranges;
+    if ([self selectedRange].length == 0) {
+        ranges = @[[NSValue valueWithRange:NSMakeRange(0, [[self string] length])]];
+    } else {
+        ranges = [self selectedRanges];
+    }
     
-    [self convertIndentation:CEIndentStyleSpace inRanges:[self selectedRanges]];
+    [self convertIndentation:CEIndentStyleSpace inRanges:ranges];
 }
 
 
@@ -176,9 +181,14 @@
 - (IBAction)convertIndentationToTabs:(nullable id)sender
 // ------------------------------------------------------
 {
-    if ([self selectedRange].length == 0) { return; }
+    NSArray<NSValue *> *ranges;
+    if ([self selectedRange].length == 0) {
+        ranges = @[[NSValue valueWithRange:NSMakeRange(0, [[self string] length])]];
+    } else {
+        ranges = [self selectedRanges];
+    }
     
-    [self convertIndentation:CEIndentStyleTab inRanges:[self selectedRanges]];
+    [self convertIndentation:CEIndentStyleTab inRanges:ranges];
 }
 
 
@@ -190,6 +200,8 @@
 - (void)convertIndentation:(CEIndentStyle)indentStyle inRanges:(nonnull NSArray<NSValue *> *)ranges
 // ------------------------------------------------------
 {
+    if ([[self string] length] == 0) { return; }
+    
     NSMutableArray<NSValue *> *replacementRanges = [NSMutableArray arrayWithCapacity:[ranges count]];
     NSMutableArray<NSString *> *replacementStrings = [NSMutableArray arrayWithCapacity:[ranges count]];