first commit

.devcontainer/.dockerignore

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+.go
+.dockerignore
+devcontainer.json

.devcontainer/.go/.gitignore

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+*
+!.gitignore

.devcontainer/Dockerfile

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+ARG UBUNTU_VERSION=22.04
+FROM ubuntu:${UBUNTU_VERSION}
+
+# apt mirror server
+ARG APT_MIRROR=""
+RUN set -x \
+    && [ "${APT_MIRROR:-}" != "" ] && sed -i -r "s@http://(\\w+.)?archive\.ubuntu\.com/ubuntu/@${APT_MIRROR}@" || :
+
+# update ca-certificates
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        ca-certificates \
+    && apt-get clean && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/*
+
+# timezone
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        tzdata \
+    && apt-get clean && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/* \
+    && ln -sf /usr/share/zoneinfo/Asia/Tokyo /etc/localtime \
+    && echo 'Asia/Tokyo' >/etc/timezone
+
+# language-pack
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        language-pack-ja-base \
+        language-pack-ja \
+    && apt-get clean && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/*
+ENV LANG=ja_JP.UTF-8
+
+# vscode user
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        sudo \
+    && apt-get clean && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/* \
+    && echo "vscode ALL=(ALL) NOPASSWD:ALL" >>/etc/sudoers.d/ALL \
+    && groupadd \
+        --gid 5000 \
+        vscode \
+    && useradd \
+        --uid 5000 \
+        --gid 5000 \
+        --home-dir /home/vscode \
+        --create-home \
+        --shell /bin/bash \
+        vscode
+
+# common dev tools
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        bash-completion \
+        curl \
+        git \
+        gnupg2 \
+        iputils-ping \
+        less \
+        net-tools \
+        tar \
+        time \
+        unzip \
+        xz-utils \
+        zip \
+    && apt-get clean && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/*
+
+# golang
+ARG GO_VERSION=1.20.5
+RUN set -x \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+    && apt-get clean && rm -rf /var/cache/apt/archives/* /var/lib/apt/lists/* \
+    && curl -fsSL "https://golang.org/dl/go${GO_VERSION}.linux-amd64.tar.gz" | tar -xz -C /usr/local
+ENV GOROOT=/usr/local/go \
+    GOPATH=/home/vscode/go \
+    PATH=/home/vscode/go/bin:/usr/local/go/bin:${PATH}
+
+USER vscode

.devcontainer/devcontainer.json

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+{
+	"name": "files",
+	"build": {
+		"dockerfile": "Dockerfile",
+		"args": {
+			"UBUNTU_VERSION": "22.04",
+			"APT_MIRROR": "http://jp.archive.ubuntu.com/ubuntu/",
+			"GO_VERSION": "1.20.6"
+		}
+	},
+	"mounts": [
+		"source=${localWorkspaceFolder}/.devcontainer/.go,target=/home/vscode/go,type=bind"
+	],
+	"postStartCommand": "/bin/bash .devcontainer/post-start.sh",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"golang.go",
+				"streetsidesoftware.code-spell-checker"
+			],
+			"settings": {
+				"go.useLanguageServer": true,
+				"go.formatTool": "goimports",
+				"go.lintTool": "golangci-lint",
+				"go.lintFlags": [
+					"--fast",
+					"-exclude=vendor/..."
+				],
+				"go.lintOnSave": "workspace",
+				"go.vetOnSave": "workspace",
+				"[go]": {
+					"editor.formatOnSave": true,
+					"editor.codeActionsOnSave": {
+						"source.organizeImports": true
+					},
+					"editor.snippetSuggestions": "bottom"
+				},
+				"[go.mod]": {
+					"editor.formatOnSave": true,
+					"editor.codeActionsOnSave": {
+						"source.organizeImports": true
+					}
+				},
+				"gopls": {
+					"usePlaceholders": true,
+					"staticcheck": false
+				}
+			}
+		}
+	}
+}

.devcontainer/post-start.sh

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+#!/bin/bash
+set -eu
+[ -f "$(go env GOPATH)/bin/gotests" ] || go install -v github.com/cweill/gotests/gotests@latest
+[ -f "$(go env GOPATH)/bin/gomodifytags" ] || go install -v github.com/fatih/gomodifytags@latest
+[ -f "$(go env GOPATH)/bin/impl" ] || go install -v github.com/josharian/impl@latest
+[ -f "$(go env GOPATH)/bin/goplay" ] || go install -v github.com/haya14busa/goplay/cmd/goplay@latest
+[ -f "$(go env GOPATH)/bin/dlv" ] || go install -v github.com/go-delve/delve/cmd/dlv@latest
+[ -f "$(go env GOPATH)/bin/golangci-lint" ] || go install -v github.com/golangci/golangci-lint/cmd/golangci-lint@latest
+[ -f "$(go env GOPATH)/bin/gopls" ] || go install -v golang.org/x/tools/gopls@latest

.vscode/extension.json

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+{
+    "recommendations": [
+        "ms-vscode-remote.remote-containers"
+    ],
+    "unwantedRecommendations": [
+    ]
+}

.vscode/settings.json

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+{
+    "terminal.integrated.allowChords": false,
+    "files.exclude": {
+        "**/.devcontainer/.go": true
+    },
+    "files.watcherExclude": {
+        "**/.devcontainer/.go": true
+    },
+    "search.exclude": {
+        "**/.devcontainer/.go": true
+    },
+    "files.autoSave": "afterDelay",
+    "files.autoSaveDelay": 1000,
+    "cSpell.ignorePaths": [
+        ".vscode",
+        ".devcontainer"
+    ],
+    "cSpell.words": [
+        "dstpath",
+        "newpath",
+        "oldpath",
+        "srcpath",
+        "thamaji"
+    ]
+}

LICENSE

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+MIT License
+
+Copyright (c) 2023 thamaji
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+files
+====
+
+一般的なファイル操作を提供する go ライブラリ。
+
+```
+$ go get github.com/thamaji/files
+```

dir.go

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+package files
+
+import (
+	"io"
+	"io/fs"
+	"os"
+)
+
+func Mkdir(name string, opt ...Option) error {
+	o := getOptions(opt...)
+	return os.Mkdir(name, o.DirPerm)
+}
+
+func MkdirAll(path string, opt ...Option) error {
+	o := getOptions(opt...)
+	return os.MkdirAll(path, o.DirPerm)
+}
+
+func Readdir(name string) ([]fs.FileInfo, error) {
+	f, err := os.OpenFile(name, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	list, err := f.Readdir(-1)
+	_ = f.Close()
+	if err != nil {
+		return nil, err
+	}
+	return list, nil
+}
+
+func MustReaddir(name string) []fs.FileInfo {
+	list, err := Readdir(name)
+	if err != nil {
+		return nil
+	}
+	return list
+}
+
+func ReadDirnames(name string) ([]string, error) {
+	f, err := os.OpenFile(name, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	list, err := f.Readdirnames(-1)
+	_ = f.Close()
+	if err != nil {
+		return nil, err
+	}
+	return list, nil
+}
+
+func MustReadDirnames(name string) []string {
+	list, err := ReadDirnames(name)
+	if err != nil {
+		return nil
+	}
+	return list
+}
+
+func ReadDir(name string) ([]fs.DirEntry, error) {
+	f, err := os.OpenFile(name, os.O_RDONLY, 0)
+	if err != nil {
+		return nil, err
+	}
+	list, err := f.ReadDir(-1)
+	_ = f.Close()
+	if err != nil {
+		return nil, err
+	}
+	return list, nil
+}
+
+func MustReadDir(name string) []fs.DirEntry {
+	list, err := ReadDir(name)
+	if err != nil {
+		return nil
+	}
+	return list
+}
+
+func RemoveAll(path string) error {
+	return os.RemoveAll(path)
+}
+
+func IsDir(name string) (bool, error) {
+	fi, err := os.Stat(name)
+	if err != nil {
+		return true, err
+	}
+	return fi.IsDir(), nil
+}
+
+func MustIsDir(name string) bool {
+	ok, err := IsDir(name)
+	if err != nil {
+		return false
+	}
+	return ok
+}
+
+func IsEmptyDir(name string) (bool, error) {
+	f, err := os.OpenFile(name, os.O_RDONLY, 0)
+	if err != nil {
+		return false, err
+	}
+	_, err = f.Readdirnames(1)
+	_ = f.Close()
+	if err == io.EOF {
+		return true, nil
+	}
+	return false, err
+}
+
+func MustIsEmptyDir(name string) bool {
+	ok, err := IsEmptyDir(name)
+	if err != nil {
+		return false
+	}
+	return ok
+}

file.go

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+package files
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+)
+
+func Open(name string, opt ...Option) (*os.File, error) {
+	return OpenFile(name, os.O_RDONLY, opt...)
+}
+
+func Create(name string, opt ...Option) (*os.File, error) {
+	return OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, opt...)
+}
+
+func OpenFile(name string, flag int, opt ...Option) (*os.File, error) {
+	o := getOptions(opt...)
+	f, err := os.OpenFile(name, flag, o.FilePerm)
+	if err != nil {
+		if !errors.Is(err, os.ErrNotExist) || flag&os.O_CREATE == 0 {
+			return nil, err
+		}
+		if err = os.MkdirAll(filepath.Dir(name), o.DirPerm); err != nil {
+			return nil, err
+		}
+		f, err = os.OpenFile(name, flag, o.FilePerm)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return f, nil
+}
+
+func ReadFile(name string) ([]byte, error) {
+	return os.ReadFile(name)
+}
+
+func WriteFile(name string, data []byte, opt ...Option) error {
+	f, err := OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, opt...)
+	if err != nil {
+		return err
+	}
+	_, err = f.Write(data)
+	if err1 := f.Sync(); err1 != nil && err == nil {
+		err = err1
+	}
+	if err1 := f.Close(); err1 != nil && err == nil {
+		err = err1
+	}
+	return err
+}