René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"ANSI escape codes in prompt incorrectly rendered in some cases","articleBody":"After a pipeline that contains a some programs from Git for Windows (e.g., cat.exe), ANSI escape codes in the prompt are incorrectly rendered.\r\n\r\n## Steps to reproduce\r\n\r\n1. Setup a prompt function that sets the prompt to *MyPrompt* in green.\r\n2. Run a command that pipes data through cat.exe from Git for Windows (problem also occurs with other programs as well, but cat.exe is the simplest).\r\n\r\n```none\r\ndoug\u003e function prompt { $ESC = [char]27; \"$ESC[38;2;0;255;0mMyPrompt$ESC[0m\u003e\" }\r\nMyPrompt\u003eecho \"n\"| \u0026 'C:\\Program Files\\Git\\usr\\bin\\cat.exe'\r\nn\r\n←[38;2;0;255;0mMyPrompt←[0m\u003e\r\n```\r\n\r\n## Expected behavior\r\n\r\n*MyPrompt* should be green.\r\n\r\n```none\r\nMyPrompt\u003e\r\n```\r\n\r\n## Actual behavior\r\n\r\nThe prompt is white with the color codes visible.\r\n\r\n```none\r\n←[38;2;0;255;0mMyPrompt←[0m\u003e\r\n```\r\n\r\n## Environment data\r\n\r\n```none\r\n$PSVersionTable\r\n\r\nName                           Value\r\n----                           -----\r\nPSVersion                      7.1.0\r\nPSEdition                      Core\r\nGitCommitId                    7.1.0\r\nOS                             Microsoft Windows 10.0.19042\r\nPlatform                       Win32NT\r\nPSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}\r\nPSRemotingProtocolVersion      2.3\r\nSerializationVersion           1.1.0.1\r\nWSManStackVersion              3.0\r\n```\r\n\r\n## Additional Notes\r\n\r\nThis problem does not occur in Windows Powershell.\r\n\r\nThis problem occurs with Powershell Core 7.1.0 both running in Windows Terminal and running PowerShell 7 directly.\r\n\r\nThis issue was originally reported to microsoft/terminal#8525, but some investigation led me to believe the problem is in PowerShell Core, not Windows Terminal (see details of that bug for more information).\r\n","author":{"url":"https://github.com/drichardson","@type":"Person","name":"drichardson"},"datePublished":"2020-12-09T18:21:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/14360/PowerShell/issues/14360"}