bpo-30674: IDLE: add docstrings to grep.py (#2213)

Patch by Cheryl Sabella

Lib/idlelib/grep.py

@@ -1,3 +1,8 @@
+"""Grep dialog for Find in Files functionality.
+
+   Inherits from SearchDialogBase for GUI and uses searchengine
+   to prepare search pattern.
+"""
 import fnmatch
 import os
 import sys
@@ -11,7 +16,17 @@ from idlelib import searchengine
 # Importing OutputWindow here fails due to import loop
 # EditorWindow -> GrepDialop -> OutputWindow -> EditorWindow
 
+
 def grep(text, io=None, flist=None):
+    """Create or find singleton GrepDialog instance.
+
+    Args:
+        text: Text widget that contains the selected text for
+              default search phrase.
+        io: iomenu.IOBinding instance with default path to search.
+        flist: filelist.FileList instance for OutputWindow parent.
+    """
+
     root = text._root()
     engine = searchengine.get(root)
     if not hasattr(engine, "_grepdialog"):
@@ -20,19 +35,32 @@ def grep(text, io=None, flist=None):
     searchphrase = text.get("sel.first", "sel.last")
     dialog.open(text, searchphrase, io)
 
+
 class GrepDialog(SearchDialogBase):
+    "Dialog for searching multiple files."
 
     title = "Find in Files Dialog"
     icon = "Grep"
     needwrapbutton = 0
 
     def __init__(self, root, engine, flist):
+        """Create search dialog for searching for a phrase in the file system.
+
+        Uses SearchDialogBase as the basis for the GUI and a
+        searchengine instance to prepare the search.
+
+        Attributes:
+            globvar: Value of Text Entry widget for path to search.
+            recvar: Boolean value of Checkbutton widget
+                    for traversing through subdirectories.
+        """
         SearchDialogBase.__init__(self, root, engine)
         self.flist = flist
         self.globvar = StringVar(root)
         self.recvar = BooleanVar(root)
 
     def open(self, text, searchphrase, io=None):
+        "Make dialog visible on top of others and ready to use."
         SearchDialogBase.open(self, text, searchphrase)
         if io:
             path = io.filename or ""
@@ -45,20 +73,30 @@ class GrepDialog(SearchDialogBase):
         self.globvar.set(os.path.join(dir, "*" + tail))
 
     def create_entries(self):
+        "Create base entry widgets and add widget for search path."
         SearchDialogBase.create_entries(self)
         self.globent = self.make_entry("In files:", self.globvar)[0]
 
     def create_other_buttons(self):
+        "Add check button to recurse down subdirectories."
         btn = Checkbutton(
                 self.make_frame()[0], variable=self.recvar,
                 text="Recurse down subdirectories")
         btn.pack(side="top", fill="both")
 
     def create_command_buttons(self):
+        "Create base command buttons and add button for search."
         SearchDialogBase.create_command_buttons(self)
         self.make_button("Search Files", self.default_command, 1)
 
     def default_command(self, event=None):
+        """Grep for search pattern in file path. The default command is bound
+        to <Return>.
+
+        If entry values are populated, set OutputWindow as stdout
+        and perform search.  The search dialog is closed automatically
+        when the search begins.
+        """
         prog = self.engine.getprog()
         if not prog:
             return
@@ -75,12 +113,19 @@ class GrepDialog(SearchDialogBase):
             sys.stdout = save
 
     def grep_it(self, prog, path):
+        """Search for prog within the lines of the files in path.
+
+        For the each file in the path directory, open the file and
+        search each line for the matching pattern.  If the pattern is
+        found,  write the file and line information to stdout (which
+        is an OutputWindow).
+        """
         dir, base = os.path.split(path)
         list = self.findfiles(dir, base, self.recvar.get())
         list.sort()
         self.close()
         pat = self.engine.getpat()
-        print("Searching %r in %s ..." % (pat, path))
+        print(f"Searching {pat!r} in {path} ...")
         hits = 0
         try:
             for fn in list:
@@ -90,20 +135,22 @@ class GrepDialog(SearchDialogBase):
                             if line[-1:] == '\n':
                                 line = line[:-1]
                             if prog.search(line):
-                                sys.stdout.write("%s: %s: %s\n" %
-                                                 (fn, lineno, line))
+                                sys.stdout.write(f"{fn}: {lineno}: {line}\n")
                                 hits += 1
                 except OSError as msg:
                     print(msg)
-            print(("Hits found: %s\n"
-                  "(Hint: right-click to open locations.)"
-                  % hits) if hits else "No hits.")
+            print(f"Hits found: {hits}\n(Hint: right-click to open locations.)"
+                  if hits else "No hits.")
         except AttributeError:
             # Tk window has been closed, OutputWindow.text = None,
             # so in OW.write, OW.text.insert fails.
             pass
 
     def findfiles(self, dir, base, rec):
+        """Return list of files in the dir that match the base pattern.
+
+        If rec is True, recursively iterate through subdirectories.
+        """
         try:
             names = os.listdir(dir or os.curdir)
         except OSError as msg:
@@ -123,11 +170,6 @@ class GrepDialog(SearchDialogBase):
                 list.extend(self.findfiles(subdir, base, rec))
         return list
 
-    def close(self, event=None):
-        if self.top:
-            self.top.grab_release()
-            self.top.withdraw()
-
 
 def _grep_dialog(parent):  # htest #
     from tkinter import Toplevel, Text, SEL, END
@@ -136,7 +178,7 @@ def _grep_dialog(parent):  # htest #
     top = Toplevel(parent)
     top.title("Test GrepDialog")
     x, y = map(int, parent.geometry().split('+')[1:])
-    top.geometry("+%d+%d" % (x, y + 175))
+    top.geometry(f"+{x}+{y + 175}")
 
     flist = PyShellFileList(top)
     text = Text(top, height=5)

Misc/NEWS.d/next/IDLE/2017-06-27-01-40-34.bpo-30674.ppK_q8.rst

@@ -0,0 +1 @@
+IDLE: add docstrings to grep module. Patch by Cheryl Sabella