Changeset 1497

Timestamp:

07/21/08 20:33:13 (5 weeks ago)

Author:

rob

Message:

Fixed #404: added GuessIndentSize? action that uses the SciTE algorithm to determine tab size

Location:

trunk/peppy

Files:

• fundamental_menu.py (modified) (3 diffs)
• lib/textutil.py (modified) (1 diff)

trunk/peppy/fundamental_menu.py

@@ -11 +11 @@
 from peppy.fundamental import *
 from peppy.lib.userparams import *
+from peppy.lib.textutil import *
 
 
@@ -222 +223 @@
         return self.mode.locals.use_tab_characters
 
+class GuessIndentSize(SelectAction):
+    """Guess the tab size of the current document or selection and set the view parameters"""
+    name = "Guess Indent Size"
+    default_menu = ("View", 309)
+
+    def action(self, index=-1, multiplier=1):
+        s = self.mode
+        (start, end) = s.GetSelection()
+        if start==end:
+            text = s.GetText()
+        else:
+            text = s.GetTextRange(start, end)
+        size = guessSpacesPerIndent(text)
+        if size == 0:
+            s.locals.use_tab_characters = True
+            self.frame.SetStatusText("Indenting with tab characters")
+        elif size > 0:
+            s.locals.use_tab_characters = False
+            s.locals.indent_size = size
+            self.frame.SetStatusText("%d spaces per indent, indenting with spaces" % (size))
+        else:
+            self.frame.SetStatusText("Can't determine indent size from document")
+        s.setTabStyle()
+
 class TabHighlight(FundamentalRadioToggle):
     local_setting = 'tab_highlight_style'
@@ -457 +482 @@
                     
                     IndentationGuides, IndentSize, IndentWithTabsOrSpaces,
-                    TabSize,
+                    TabSize, GuessIndentSize,
                     
                     CaretLineHighlight, CaretWidth, ViewWhitespace,

trunk/peppy/lib/textutil.py

@@ -130 +130 @@
         return True
     return False
+
+
+def guessSpacesPerIndent(text):
+    """Guess the number of spaces per indent level
+    
+    Takes from the SciTE source file SciTEBase::DiscoverIndentSetting
+    """
+    tabsizes = [0]*9
+    indent = 0 # current line indentation
+    previndent = 0 # previous line indentation
+    prevsize = -1 # previous line tab size
+    newline = True
+    for c in text:
+        if c == '\n' or c == '\r':
+            newline = True
+            indent = 0
+        elif newline:
+            if c == ' ':
+                indent += 1
+            else:
+                if indent:
+                    if indent == previndent and prevsize >= 0:
+                        tabsizes[prevsize] += 1
+                    elif indent > previndent and previndent >= 0:
+                        if indent - previndent <= 8:
+                            prevsize = indent - previndent
+                            tabsizes[prevsize] += 1
+                        else:
+                            prevsize = -1
+                    previndent = indent
+                elif c == '\t':
+                    tabsizes[0] += 1
+                newline = False
+    
+    # find maximum non-zero indent
+    index = -1
+    for i, size in enumerate(tabsizes):
+        if size > 0 and (index == -1 or size > tabsizes[index]):
+            index = i
+    
+    return index
+
+
+if __name__ == "__main__":
+    import sys
+    
+    for file in sys.argv[1:]:
+        fh = open(file)
+        text = fh.read()
+        print "file=%s, tabsize=%d" % (file, guessSpacesPerIndent(text))