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bpo-38041: Refine IDLE Shell restart lines. (GH-15709)

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Restart lines now always start with '=' and never end with ' ' and fill the width of the window unless that would require ending with ' ', which could be wrapped by itself and possible confusing the user.
(cherry picked from commit 38da805d56)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
This commit is contained in:
Miss Islington (bot) 2019-09-06 11:14:49 -07:00 • committed by GitHub
parent 4d1abedce9
commit 4009a8522d
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 44 additions and 3 deletions
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18
Lib/idlelib/pyshell.py
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@ -387,6 +387,19 @@ class MyRPCClient(rpc.RPCClient):
"Override the base class - just re-raise EOFError"
raise EOFError
def restart_line(width, filename): # See bpo-38141.
"""Return width long restart line formatted with filename.
Fill line with balanced '='s, with any extras and at least one at
the beginning. Do not end with a trailing space.
"""
tag = f"= RESTART: {filename or 'Shell'} ="
if width >= len(tag):
div, mod = divmod((width -len(tag)), 2)
return f"{(div+mod)*'='}{tag}{div*'='}"
else:
return tag[:-2] # Remove ' ='.
class ModifiedInterpreter(InteractiveInterpreter):
@ -491,9 +504,8 @@ class ModifiedInterpreter(InteractiveInterpreter):
console.stop_readline()
# annotate restart in shell window and mark it
console.text.delete("iomark", "end-1c")
tag = 'RESTART: ' + (filename if filename else 'Shell')
halfbar = ((int(console.width) -len(tag) - 4) // 2) * '='
console.write("\n{0} {1} {0}".format(halfbar, tag))
console.write('\n')
console.write(restart_line(console.width, filename))
console.text.mark_set("restart", "end-1c")
console.text.mark_gravity("restart", "left")
if not filename: