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doc/go1: mention that regexp has changed
Also restore alphabetical order. R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/5701053
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doc/go1.html
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doc/go1.html
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@ -1702,6 +1702,39 @@ Code that uses the old POSIX error values from the <code>os</code> package
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will fail to compile and will also need to be updated by hand.
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</p>
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<h3 id="os_signal">The os/signal package</h3>
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<p>
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The <code>os/signal</code> package in Go 1 replaces the
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<code>Incoming</code> function, which returned a channel
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that received all incoming signals,
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with the selective <code>Notify</code> function, which asks
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for delivery of specific signals on an existing channel.
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</p>
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<p>
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<em>Updating</em>:
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Code must be updated by hand.
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A literal translation of
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</p>
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<pre>
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c := signal.Incoming()
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</pre>
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<p>
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is
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</p>
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<pre>
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c := make(chan os.Signal)
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signal.Notify(c) // ask for all signals
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</pre>
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<p>
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but most code should list the specific signals it wants to handle instead:
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</p>
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<pre>
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c := make(chan os.Signal)
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signal.Notify(c, syscall.SIGHUP, syscall.SIGQUIT)
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</pre>
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<h3 id="path_filepath">The path/filepath package</h3>
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<p>
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@ -1747,38 +1780,19 @@ will need to be updated by hand.
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The compiler will catch code using the old interface.
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</p>
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<h3 id="os_signal">The os/signal package</h3>
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<h3 id="regexp">The regexp package</h3>
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<p>
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The <code>os/signal</code> package in Go 1 replaces the
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<code>Incoming</code> function, which returned a channel
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that received all incoming signals,
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with the selective <code>Notify</code> function, which asks
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for delivery of specific signals on an existing channel.
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The <a href="/pkg/regexp/"><code>regexp</code></a> package has been rewritten.
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It has the same interface but the specification of the regular expressions
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it supports has changed from the old "egrep" form to that of
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<a href="code.google.com/p/re2">RE2</a>.
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</p>
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<p>
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<em>Updating</em>:
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Code must be updated by hand.
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A literal translation of
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Code that uses the package should have its regular expressions checked by hand.
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</p>
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<pre>
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c := signal.Incoming()
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</pre>
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<p>
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is
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</p>
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<pre>
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c := make(chan os.Signal)
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signal.Notify(c) // ask for all signals
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</pre>
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<p>
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but most code should list the specific signals it wants to handle instead:
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</p>
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<pre>
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c := make(chan os.Signal)
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signal.Notify(c, syscall.SIGHUP, syscall.SIGQUIT)
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</pre>
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<h3 id="runtime">The runtime package</h3>
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76
doc/go1.tmpl
76
doc/go1.tmpl
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@ -1601,37 +1601,6 @@ Code that uses the old POSIX error values from the <code>os</code> package
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will fail to compile and will also need to be updated by hand.
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</p>
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<h3 id="path_filepath">The path/filepath package</h3>
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<p>
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In Go 1, the <a href="/pkg/path/filepath/#Walk"><code>Walk</code></a> function of the
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<code>path/filepath</code> package
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has been changed to take a function value of type
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<a href="/pkg/path/filepath/#WalkFunc"><code>WalkFunc</code></a>
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instead of a <code>Visitor</code> interface value.
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<code>WalkFunc</code> unifies the handling of both files and directories.
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</p>
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<pre>
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type WalkFunc func(path string, info os.FileInfo, err error) error
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</pre>
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<p>
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The <code>WalkFunc</code> function will be called even for files or directories that could not be opened;
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in such cases the error argument will describe the failure.
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If a directory's contents are to be skipped,
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the function should return the value <a href="/pkg/path/filepath/#variables"><code>filepath.SkipDir</code></a>
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</p>
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{{code "progs/go1.go" `/STARTWALK/` `/ENDWALK/`}}
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<p>
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<em>Updating</em>:
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The change simplifies most code but has subtle consequences, so affected programs
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will need to be updated by hand.
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The compiler will catch code using the old interface.
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</p>
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<h3 id="os_signal">The os/signal package</h3>
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<p>
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@ -1665,6 +1634,51 @@ c := make(chan os.Signal)
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signal.Notify(c, syscall.SIGHUP, syscall.SIGQUIT)
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</pre>
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<h3 id="path_filepath">The path/filepath package</h3>
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<p>
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In Go 1, the <a href="/pkg/path/filepath/#Walk"><code>Walk</code></a> function of the
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<code>path/filepath</code> package
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has been changed to take a function value of type
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<a href="/pkg/path/filepath/#WalkFunc"><code>WalkFunc</code></a>
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instead of a <code>Visitor</code> interface value.
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<code>WalkFunc</code> unifies the handling of both files and directories.
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</p>
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<pre>
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type WalkFunc func(path string, info os.FileInfo, err error) error
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</pre>
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<p>
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The <code>WalkFunc</code> function will be called even for files or directories that could not be opened;
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in such cases the error argument will describe the failure.
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If a directory's contents are to be skipped,
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the function should return the value <a href="/pkg/path/filepath/#variables"><code>filepath.SkipDir</code></a>
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</p>
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{{code "progs/go1.go" `/STARTWALK/` `/ENDWALK/`}}
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<p>
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<em>Updating</em>:
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The change simplifies most code but has subtle consequences, so affected programs
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will need to be updated by hand.
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The compiler will catch code using the old interface.
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</p>
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<h3 id="regexp">The regexp package</h3>
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<p>
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The <a href="/pkg/regexp/"><code>regexp</code></a> package has been rewritten.
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It has the same interface but the specification of the regular expressions
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it supports has changed from the old "egrep" form to that of
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<a href="code.google.com/p/re2">RE2</a>.
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</p>
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<p>
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<em>Updating</em>:
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Code that uses the package should have its regular expressions checked by hand.
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</p>
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<h3 id="runtime">The runtime package</h3>
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<p>
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