783be64cf1
`brew-unpack` is inspired by the `unpack` command of Haskell's Cabal.
`brew unpack <formulae ...>` will fetch the source code archives of one or more
formula and extract them into subfolders of the current working directory. An
alternate root directory may be specified by invoking the `--destdir` flag.
This provides some nice advantages for inspecting source code compared to
`brew install -i -f <formula>`:
- The extracted source code won't be deleted when the Ruby process
terminates---which allows for long-term experimentation.
- The user has control over which directory the code is extracted into.
- No install process is initiated, so accidentally typing the equivalent of
`exit 0` will not cause `brew` to mess with an existing installation.
- Several formulae may be unpacked at once.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
54 lines
1.4 KiB
Ruby
Executable File
54 lines
1.4 KiB
Ruby
Executable File
require 'formula'
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module Homebrew extend self
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def unpack
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unpack_usage = <<-EOS
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Usage: brew unpack [--destdir=path/to/extract/in] <formulae ...>
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Unpack formulae source code for inspection.
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Formulae archives will be extracted to subfolders inside the current working
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directory or a directory specified by `--destdir`.
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EOS
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if ARGV.empty?
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puts unpack_usage
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exit 0
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end
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formulae = ARGV.named
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raise FormulaUnspecifiedError if formulae.empty?
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unpack_dir = ARGV.options_only.select {|o| o.start_with? "--destdir="}
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if unpack_dir.empty?
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unpack_dir = Pathname.new Dir.getwd
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else
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unpack_dir = Pathname.new(unpack_dir.first.split('=')[1]).realpath
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unpack_dir.mkpath unless unpack_dir.exist?
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end
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raise "Cannot write to #{unpack_dir}" unless unpack_dir.writable?
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formulae.each do |f|
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f = Formula.factory(f)
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unless f.downloader.kind_of? CurlDownloadStrategy
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stage_dir = unpack_dir + [f.name, f.version].join('-')
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stage_dir.mkpath unless stage_dir.exist?
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else
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stage_dir = unpack_dir
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end
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# Can't use a do block here without DownloadStrategy do blocks throwing:
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# warning: conflicting chdir during another chdir block
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Dir.chdir stage_dir
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f.downloader.fetch
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f.downloader.stage
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Dir.chdir unpack_dir
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end
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end
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end
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# Here is the actual code that gets run when `brew` loads this external
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# command.
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Homebrew.unpack
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