#3 shellcheck（静的解析）と shfmt（lint）の実装

.devcontainer/Dockerfile

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+# See here for image contents: https://github.com/microsoft/vscode-dev-containers/tree/v0.177.0/containers/alpine/.devcontainer/base.Dockerfile
+
+# [Choice] Alpine version: 3.13, 3.12, 3.11, 3.10
+ARG VARIANT="3.13"
+FROM mcr.microsoft.com/vscode/devcontainers/base:0-alpine-${VARIANT}
+
+RUN apk update \
+     && apk add --no-cache \
+        shellcheck \
+        shfmt

.devcontainer/README.md

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+# 開発用ディレクトリ
+
+このディレクトリは [Docker](https://ja.wikipedia.org/wiki/Docker) の Alpine Linux コンテナ上でスクリプトの開発をするためのものです。
+
+[VSCode](https://code.visualstudio.com/) と、その [Remote - Containers](https://code.visualstudio.com/docs/remote/remote-overview) 拡張機能がインストールされていれば、同じ開発環境を利用することができます。

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.177.0/containers/alpine
+{
+	"name": "Alpine",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick an Alpine version: 3.10, 3.11, 3.12, 3.13
+		"args": { "VARIANT": "3.13" }
+	},
+
+	// Set *default* container specific settings.json values on container create. 
+	"settings": {
+		"terminal.integrated.shell.linux": "/bin/bash"
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	// Note that some extensions may not work in Alpine Linux. See https://aka.ms/vscode-remote/linux.
+	"extensions": [
+		"foxundermoon.shell-format"
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	// "postCreateCommand": "uname -a",
+
+	// Uncomment when using a ptrace-based debugger like C++, Go, and Rust
+	// "runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

.editorconfig

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+# -----------------------------------------------------------------------------
+#  editorconfig 互換用設定ファイル
+# -----------------------------------------------------------------------------
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# Shell-format
+[*.sh]
+indent_style       = space # shfmt -i=4
+indent_size        = 4     # shfmt -i=4
+shell_variant      = posix  # shfmt -ln=posix
+binary_next_line   = true  # shfmt -bn
+switch_case_indent = true  # shfmt -ci
+space_redirects    = false # shfmt -sr
+keep_padding       = true  # shfmt -kp
+function_next_line = false # disable shfmt -fn
+
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+quote_type = single

.github/run-lint.sh

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+#!/bin/sh
+# =============================================================================
+#  ShellCheck & ShellFormat(shfmt) の一括実行スクリプト
+# =============================================================================
+
+# -----------------------------------------------------------------------------
+#  Constants
+# -----------------------------------------------------------------------------
+PATH_DIR_REPO="$(dirname "$(cd "$(dirname "${BASH_SOURCE:-$0}")" && pwd)")"
+PATH_DIR_BIN="${PATH_DIR_REPO}/bin"
+PATH_DIR_RETURN="$(cd . && pwd)"
+SUCCESS=0
+FAILURE=1
+
+# 拡張子のないスクリプトファイル一覧（テスト対象リスト）
+LIST_SCRIPT_NO_EXT="archive check dec enc keygen sign verify"
+
+echo '-------------------------------------------------------------------------------'
+echo ' Requirement Check'
+echo '-------------------------------------------------------------------------------'
+
+# ShellCheck のインストールチェック
+which shellcheck 1>/dev/null 2>/dev/null || {
+    echo >&2 "shellcheck がインストールされていません"
+    echo >&2 "参考文献: https://github.com/Qithub-BOT/QiiCipher/issues/3"
+
+    exit $FAILURE
+}
+echo "ShellCheck $(shellcheck --version | grep version:)"
+
+# shfmt のインストールチェック
+which shfmt 1>/dev/null 2>/dev/null || {
+    echo >&2 "shfmt がインストールされていません"
+    echo >&2 "参考文献: https://github.com/Qithub-BOT/QiiCipher/issues/3"
+
+    exit $FAILURE
+}
+echo "shfmt version: $(shfmt --version)"
+
+# -----------------------------------------------------------------------------
+#  Functions
+# -----------------------------------------------------------------------------
+indentStdIn() {
+    indent="\t"
+    while IFS= read -r line; do
+        printf "${indent}%s\n" "${line}"
+    done
+    echo
+}
+
+runShfmt() {
+    printf "%s" '- Shellformat ... '
+
+    runShfmtForShExt && runShfmtForNoExt && echo 'OK'
+}
+
+runShfmtForShExt() {
+    find . -name '*.sh' -type f -print0 | xargs -0 shfmt -d
+}
+
+runShfmtForNoExt() {
+    result=$SUCCESS
+
+    # shellcheck disable=SC2086
+    set -- $LIST_SCRIPT_NO_EXT
+
+    while [ ! "$1" ]; do
+        path_file_target="${PATH_DIR_BIN}/${1}"
+
+        shfmt -d "$path_file_target" || {
+            echo "File: ${path_file_target}"
+            result=$FAILURE
+        }
+
+        shift
+    done
+
+    return $result
+}
+
+runShellCheck() {
+    printf "%s" '- ShellCheck ... '
+
+    runShellCheckShExt && runShellCheckForNoExt && echo 'OK'
+}
+
+runShellCheckShExt() {
+    find . -name '*.sh' -type f -print0 | xargs -0 shellcheck --external-sources
+}
+
+runShellCheckForNoExt() {
+    # shellcheck disable=SC2086
+    set -- $LIST_SCRIPT_NO_EXT
+    while [ ! "${1:+none}" ]; do
+        path_file_target="${PATH_DIR_BIN}/${1}"
+
+        shellcheck --external-sources "$path_file_target"
+
+        shift
+    done
+}
+
+# -----------------------------------------------------------------------------
+#  Main
+# -----------------------------------------------------------------------------
+set -eu
+
+cd "$PATH_DIR_REPO" || {
+    echo >&2 "Failed to change dir to: ${PATH_DIR_REPO}"
+
+    exit $FAILURE
+}
+
+echo '-------------------------------------------------------------------------------'
+echo ' Running linters'
+echo '-------------------------------------------------------------------------------'
+runShfmt
+runShellCheck
+
+cd "$PATH_DIR_RETURN" || {
+    echo >&2 "Failed to change dir to: ${PATH_DIR_RETURN}"
+
+    exit $FAILURE
+}

.github/workflows/shellcheck_linux.yml

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+name: shellcheck
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  lint_check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v2
+
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.15.x
+
+      - name: Use Cache for Go
+        uses: actions/cache@v2
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+
+      - name: Download Modules
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: go mod download
+
+      - name: Install latest shfmt
+        run: |
+          GO111MODULE=on go get mvdan.cc/sh/v3/cmd/shfmt
+
+      - name: Run shfmt and shellcheck
+        run: |
+          ./.github/run-lint.sh

.shellcheckrc

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+# =============================================================================
+#  ShellCheck Configuration
+# =============================================================================
+#  See: https://github.com/koalaman/shellcheck/wiki/
+
+# Disable
+#   SC2230: https://github.com/koalaman/shellcheck/wiki/SC2230
+disable=SC2230