Regression of brew search, it doesn't honor tty

[yurikoles]

Please note we will close your issue without comment if you delete, do not read or do not fill out the issue checklist below and provide ALL the requested information. If you repeatedly fail to use the issue template, we will block you from ever submitting issues to Homebrew again.

• [x] are reporting a bug others will be able to reproduce and not asking a question. If you're not sure or want to ask a question do so on our Discourse: https://discourse.brew.sh
• [x] ran a brew command and reproduced the problem with multiple formulae? If it's a problem with a single, official formula (not cask) please file this issue at Homebrew/homebrew-core: https://github.com/Homebrew/homebrew-core/issues/new/choose. If it's a brew cask problem please file this issue at https://github.com/Homebrew/homebrew-cask/issues/new/choose. If it's a tap (e.g. Homebrew/homebrew-php) problem please file this issue at the tap.
• [x] ran brew update and can still reproduce the problem?
• [x] ran brew doctor, fixed all issues and can still reproduce the problem?
• [x] ran brew config and brew doctor and included their output with your issue?

To help us debug your issue please explain:

• What you were trying to do (and why) I want to combine output of brew search with some other command via pipe, e.g. install.
• What happened (include command output)

  $ brew search apple-gcc42|xargs brew install
  Error: No available formula with the name "==>" 
  ==> Searching for a previously deleted formula (in the last month)...
  Error: No previously deleted formula found.
  ==> Searching for similarly named formulae...
  These similarly named formulae were found:
  a2ps
  <lists a lot of formulas>
  zzz

• What you expected to happen brew search detects that its used in pipe and prints only formula/cask names.
• Step-by-step reproduction instructions (by running brew commands) $ brew search apple-gcc42|xargs brew install

brew doctor

``` Please note that these warnings are just used to help the Homebrew maintainers with debugging if you file an issue. If everything you use Homebrew for is working fine: please don't worry or file an issue; just ignore this. Thanks! Warning: "config" scripts exist outside your system or Homebrew directories. `./configure` scripts often look for *-config scripts to determine if software packages are installed, and what additional flags to use when compiling and linking. Having additional scripts in your path can confuse software installed via Homebrew if the config script overrides a system or Homebrew provided script of the same name. We found the following "config" scripts: /Applications/Wine Staging.app/Contents/Resources/wine/bin/xslt-config /Applications/Wine Staging.app/Contents/Resources/wine/bin/xml2-config Warning: Putting non-prefixed coreutils in your path can cause gmp builds to fail. ```

brew config

``` HOMEBREW_VERSION: 1.7.6-9-g2ea3aee ORIGIN: https://github.com/Homebrew/brew HEAD: 2ea3aee461f4b2f22ccc9b6f72b4426448bc1039 Last commit: 68 minutes ago Core tap ORIGIN: https://github.com/Homebrew/homebrew-core Core tap HEAD: bb29454d2a50f8fc24173dc188e4402d1bade79b Core tap last commit: 17 minutes ago HOMEBREW_PREFIX: /usr/local HOMEBREW_DEV_CMD_RUN: 1 HOMEBREW_GITHUB_API_TOKEN: set HOMEBREW_NO_EMOJI: 1 CPU: quad-core 64-bit haswell Homebrew Ruby: 2.3.7 => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby Clang: 10.0 build 1000 Git: 2.19.0 => /usr/local/bin/git Curl: 7.54.0 => /usr/bin/curl Java: 10.0.2 macOS: 10.14-x86_64 CLT: 10.0.0.0.1.1535735448 CLT headers: 10.0.0.0.1.1535735448 Xcode: 10.0 XQuartz: 2.7.11 => /opt/X11 ```

Related: #2861 https://github.com/Homebrew/homebrew-cask/issues/29596

[yurikoles]

Example of search of cask:

$ brew search dotnet|xargs brew cask install 
Error: Cask '==>' is unavailable: No Cask with this name exists. Did you mean one of these?
0-ad                       1password-cli              4k-slideshow-maker
010-editor                 1password6                 4k-stogram
0xed                       245cloud                   4k-video-downloader
115browser                 33-rpm                     4k-video-to-mp3
1clipboard                 360safe                    4k-youtube-to-mp3
1password                  3cxphone                   4peaks
1password-beta             3dconnexion```

[MikeMcQuaid]

@yurikoles Thanks! Could you check out earlier tags and report what is the latest one in which you cannot reproduce the issue?

[yurikoles]

Thanks for suggestion, I got deeper and bisected, it's definitely da193d2f7efc2079db8da8056e53fc458d5e2036

[yurikoles]

I had used brew search dotnet|xargs brew cask install to test it.

[yurikoles]

Same with brew search gcc@7|xargs brew install

It works in f7d0c89c21bc843b1f69cc5c028a9044e1e43c0d, but broken in da193d2f7efc2079db8da8056e53fc458d5e2036

[reitermarkus]

This is working as intended, the only commands supported for scripting are brew search and brew search --casks, since these are the only ones where you can know if they will return formulae or casks.