Update directories sample to use WalkDir
Since Go 1.16, WalkDir is the recommended alternative over Walk
This commit is contained in:
Eli Bendersky
parent
41dd5d97b1
commit
8a64f89840
@ -5,6 +5,7 @@ package main
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import (
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"fmt"
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"io/fs"
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"os"
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"path/filepath"
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)
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@ -76,19 +77,19 @@ func main() {
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check(err)
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// We can also visit a directory *recursively*,
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// including all its sub-directories. `Walk` accepts
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// including all its sub-directories. `WalkDir` accepts
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// a callback function to handle every file or
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// directory visited.
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fmt.Println("Visiting subdir")
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err = filepath.Walk("subdir", visit)
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err = filepath.WalkDir("subdir", visit)
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}
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// `visit` is called for every file or directory found
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// recursively by `filepath.Walk`.
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func visit(p string, info os.FileInfo, err error) error {
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// recursively by `filepath.WalkDir`.
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func visit(path string, d fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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fmt.Println(" ", p, info.IsDir())
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fmt.Println(" ", path, d.IsDir())
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return nil
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}
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@ -1,2 +1,2 @@
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d2eaefdc6dbeaf130e4824403baa948b5845c0ec
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cICbVSX51zI
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21e35905e45d7b391823ea761d69199e3712d92c
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ORNj2BPrLQr
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15
public/directories
generated
15
public/directories
generated
@ -42,7 +42,7 @@
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</td>
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<td class="code leading">
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<a href="https://go.dev/play/p/cICbVSX51zI"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<a href="https://go.dev/play/p/ORNj2BPrLQr"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
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<pre class="chroma"><code><span class="line"><span class="cl"><span class="kn">package</span> <span class="nx">main</span></span></span></code></pre>
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</td>
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</tr>
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@ -55,6 +55,7 @@
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<pre class="chroma"><code><span class="line"><span class="cl"><span class="kn">import</span> <span class="p">(</span>
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</span></span><span class="line"><span class="cl"> <span class="s">"fmt"</span>
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</span></span><span class="line"><span class="cl"> <span class="s">"io/fs"</span>
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</span></span><span class="line"><span class="cl"> <span class="s">"os"</span>
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</span></span><span class="line"><span class="cl"> <span class="s">"path/filepath"</span>
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</span></span><span class="line"><span class="cl"><span class="p">)</span></span></span></code></pre>
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@ -242,7 +243,7 @@ when listing the <em>current</em> directory.</p>
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<tr>
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<td class="docs">
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<p>We can also visit a directory <em>recursively</em>,
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including all its sub-directories. <code>Walk</code> accepts
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including all its sub-directories. <code>WalkDir</code> accepts
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a callback function to handle every file or
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directory visited.</p>
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@ -250,7 +251,7 @@ directory visited.</p>
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<td class="code leading">
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<pre class="chroma"><code><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">"Visiting subdir"</span><span class="p">)</span>
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</span></span><span class="line"><span class="cl"> <span class="nx">err</span> <span class="p">=</span> <span class="nx">filepath</span><span class="p">.</span><span class="nf">Walk</span><span class="p">(</span><span class="s">"subdir"</span><span class="p">,</span> <span class="nx">visit</span><span class="p">)</span>
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</span></span><span class="line"><span class="cl"> <span class="nx">err</span> <span class="p">=</span> <span class="nx">filepath</span><span class="p">.</span><span class="nf">WalkDir</span><span class="p">(</span><span class="s">"subdir"</span><span class="p">,</span> <span class="nx">visit</span><span class="p">)</span>
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</span></span><span class="line"><span class="cl"><span class="p">}</span></span></span></code></pre>
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</td>
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</tr>
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@ -258,16 +259,16 @@ directory visited.</p>
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<tr>
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<td class="docs">
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<p><code>visit</code> is called for every file or directory found
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recursively by <code>filepath.Walk</code>.</p>
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recursively by <code>filepath.WalkDir</code>.</p>
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</td>
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<td class="code">
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<pre class="chroma"><code><span class="line"><span class="cl"><span class="kd">func</span> <span class="nf">visit</span><span class="p">(</span><span class="nx">p</span> <span class="kt">string</span><span class="p">,</span> <span class="nx">info</span> <span class="nx">os</span><span class="p">.</span><span class="nx">FileInfo</span><span class="p">,</span> <span class="nx">err</span> <span class="kt">error</span><span class="p">)</span> <span class="kt">error</span> <span class="p">{</span>
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<pre class="chroma"><code><span class="line"><span class="cl"><span class="kd">func</span> <span class="nf">visit</span><span class="p">(</span><span class="nx">path</span> <span class="kt">string</span><span class="p">,</span> <span class="nx">d</span> <span class="nx">fs</span><span class="p">.</span><span class="nx">DirEntry</span><span class="p">,</span> <span class="nx">err</span> <span class="kt">error</span><span class="p">)</span> <span class="kt">error</span> <span class="p">{</span>
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</span></span><span class="line"><span class="cl"> <span class="k">if</span> <span class="nx">err</span> <span class="o">!=</span> <span class="kc">nil</span> <span class="p">{</span>
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</span></span><span class="line"><span class="cl"> <span class="k">return</span> <span class="nx">err</span>
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</span></span><span class="line"><span class="cl"> <span class="p">}</span>
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</span></span><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">" "</span><span class="p">,</span> <span class="nx">p</span><span class="p">,</span> <span class="nx">info</span><span class="p">.</span><span class="nf">IsDir</span><span class="p">())</span>
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</span></span><span class="line"><span class="cl"> <span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="s">" "</span><span class="p">,</span> <span class="nx">path</span><span class="p">,</span> <span class="nx">d</span><span class="p">.</span><span class="nf">IsDir</span><span class="p">())</span>
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</span></span><span class="line"><span class="cl"> <span class="k">return</span> <span class="kc">nil</span>
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</span></span><span class="line"><span class="cl"><span class="p">}</span></span></span></code></pre>
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</td>
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@ -316,7 +317,7 @@ recursively by <code>filepath.Walk</code>.</p>
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</div>
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<script>
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var codeLines = [];
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"os\"\u000A \"path/filepath\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\u003D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' err :\u003D os.Mkdir(\"subdir\", 0755)\u000A check(err)\u000A');codeLines.push(' defer os.RemoveAll(\"subdir\")\u000A');codeLines.push(' createEmptyFile :\u003D func(name string) {\u000A d :\u003D []byte(\"\")\u000A check(os.WriteFile(name, d, 0644))\u000A }\u000A');codeLines.push(' createEmptyFile(\"subdir/file1\")\u000A');codeLines.push(' err \u003D os.MkdirAll(\"subdir/parent/child\", 0755)\u000A check(err)\u000A');codeLines.push(' createEmptyFile(\"subdir/parent/file2\")\u000A createEmptyFile(\"subdir/parent/file3\")\u000A createEmptyFile(\"subdir/parent/child/file4\")\u000A');codeLines.push(' c, err :\u003D os.ReadDir(\"subdir/parent\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent\")\u000A for _, entry :\u003D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \u003D os.Chdir(\"subdir/parent/child\")\u000A check(err)\u000A');codeLines.push(' c, err \u003D os.ReadDir(\".\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent/child\")\u000A for _, entry :\u003D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \u003D os.Chdir(\"../../..\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Visiting subdir\")\u000A err \u003D filepath.Walk(\"subdir\", visit)\u000A}\u000A');codeLines.push('func visit(p string, info os.FileInfo, err error) error {\u000A if err !\u003D nil {\u000A return err\u000A }\u000A fmt.Println(\" \", p, info.IsDir())\u000A return nil\u000A}\u000A');codeLines.push('');
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codeLines.push('');codeLines.push('package main\u000A');codeLines.push('import (\u000A \"fmt\"\u000A \"io/fs\"\u000A \"os\"\u000A \"path/filepath\"\u000A)\u000A');codeLines.push('func check(e error) {\u000A if e !\u003D nil {\u000A panic(e)\u000A }\u000A}\u000A');codeLines.push('func main() {\u000A');codeLines.push(' err :\u003D os.Mkdir(\"subdir\", 0755)\u000A check(err)\u000A');codeLines.push(' defer os.RemoveAll(\"subdir\")\u000A');codeLines.push(' createEmptyFile :\u003D func(name string) {\u000A d :\u003D []byte(\"\")\u000A check(os.WriteFile(name, d, 0644))\u000A }\u000A');codeLines.push(' createEmptyFile(\"subdir/file1\")\u000A');codeLines.push(' err \u003D os.MkdirAll(\"subdir/parent/child\", 0755)\u000A check(err)\u000A');codeLines.push(' createEmptyFile(\"subdir/parent/file2\")\u000A createEmptyFile(\"subdir/parent/file3\")\u000A createEmptyFile(\"subdir/parent/child/file4\")\u000A');codeLines.push(' c, err :\u003D os.ReadDir(\"subdir/parent\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent\")\u000A for _, entry :\u003D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \u003D os.Chdir(\"subdir/parent/child\")\u000A check(err)\u000A');codeLines.push(' c, err \u003D os.ReadDir(\".\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Listing subdir/parent/child\")\u000A for _, entry :\u003D range c {\u000A fmt.Println(\" \", entry.Name(), entry.IsDir())\u000A }\u000A');codeLines.push(' err \u003D os.Chdir(\"../../..\")\u000A check(err)\u000A');codeLines.push(' fmt.Println(\"Visiting subdir\")\u000A err \u003D filepath.WalkDir(\"subdir\", visit)\u000A}\u000A');codeLines.push('func visit(path string, d fs.DirEntry, err error) error {\u000A if err !\u003D nil {\u000A return err\u000A }\u000A fmt.Println(\" \", path, d.IsDir())\u000A return nil\u000A}\u000A');codeLines.push('');
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</script>
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<script src="site.js" async></script>
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</body>
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