mirror of
https://github.com/QL-Win/QuickLook.git
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ema
86 lines
2.6 KiB
C#
86 lines
2.6 KiB
C#
// Copyright © 2017-2026 QL-Win Contributors
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//
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// This file is part of QuickLook program.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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using System;
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using System.IO;
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namespace QuickLook.Plugin.TextViewer.Detectors;
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/// <summary>
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/// Detect whether a text file without suffix is a shell script file
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/// </summary>
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public sealed class ShellScriptDetector : IFormatDetector
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{
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public string Name => "Shell Script";
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public string Extension => ".sh";
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public bool Detect(string path, string text)
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{
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if (string.IsNullOrEmpty(text)) return false;
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// Only handle files without extension
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if (Path.GetExtension(path) != string.Empty)
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return false;
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ReadOnlySpan<char> span = text.AsSpan();
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int i = 0;
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// Skip UTF-8 BOM (\uFEFF) if present
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if (span.Length > 0 && span[0] == '\uFEFF')
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i = 1;
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// Must start with shebang "#!"
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if (span.Length < i + 2 || span[i] != '#' || span[i + 1] != '!')
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return false;
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i += 2;
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// Skip whitespace after shebang
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while (i < span.Length && (span[i] == ' ' || span[i] == '\t'))
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i++;
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// Read the first line only
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int start = i;
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while (i < span.Length && span[i] != '\n' && span[i] != '\r')
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i++;
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var line = span.Slice(start, i - start).Trim();
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// Case 1: direct interpreter path (e.g. /bin/bash, /bin/sh)
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if (line.Length >= 2 &&
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line[line.Length - 2] == 's' &&
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line[line.Length - 1] == 'h')
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return true;
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// Case 2: env style (e.g. /usr/bin/env bash)
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int lastSpace = line.LastIndexOf(' ');
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if (lastSpace >= 0)
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{
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var lastToken = line.Slice(lastSpace + 1);
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if (lastToken.Length >= 2 &&
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lastToken[lastToken.Length - 2] == 's' &&
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lastToken[lastToken.Length - 1] == 'h')
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return true;
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}
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return false;
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}
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}
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