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namespace NpgsqlRestClient;

/// <summary>

/// Implements the <c>--install-skill</c> command: downloads the three Claude Code skill files

/// (SKILL.md, annotations-reference.md, configuration-reference.jsonc) from the version branch

/// matching the running binary - falling back to master when that branch is not available - into

/// <c>./.claude/skills/npgsqlrest</c> (project scope, the default) or

/// <c>~/.claude/skills/npgsqlrest</c> (global scope).

/// </summary>

public static class SkillInstaller

{

private static readonly string[] SkillFiles = ["SKILL.md", "annotations-reference.md", "configuration-reference.jsonc"];

/// <summary>Path of the skill folder inside the repository (same in every ref).</summary>

private const string RepoPath = ".claude/skills/npgsqlrest";

/// <summary>

/// Base URL up to (excluding) the git ref. Overridable via the NPGSQLREST_SKILL_BASE_URL

/// environment variable for tests and enterprise mirrors exposing the same

/// <c>{base}/{ref}/.claude/skills/npgsqlrest/{file}</c> layout.

/// </summary>

private static string BaseUrl =>

Environment.GetEnvironmentVariable("NPGSQLREST_SKILL_BASE_URL")?.TrimEnd('/')

?? "https://raw.githubusercontent.com/NpgsqlRest/NpgsqlRest";

/// <summary>The running version as the release branch name, e.g. "3.21.0".</summary>

public static string VersionBranch

{

get

{

var v = System.Reflection.Assembly.GetAssembly(typeof(SkillInstaller))?.GetName().Version;

return v is null ? "master" : $"{v.Major}.{v.Minor}.{Math.Max(v.Build, 0)}";

}

public static async Task<int> InstallAsync(bool global)

{

var targetRoot = global

? Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)

: Directory.GetCurrentDirectory();

var targetDir = Path.Combine(targetRoot, ".claude", "skills", "npgsqlrest");

var version = VersionBranch;

using var http = new HttpClient { Timeout = TimeSpan.FromSeconds(30) };

http.DefaultRequestHeaders.UserAgent.ParseAdd($"npgsqlrest/{version}");

// All files must come from the SAME ref for a consistent skill: try the branch matching

// this version first, then master. Files are downloaded fully into memory before anything

// is written, so a network failure never leaves a partial install behind.

(string GitRef, bool IsFallback)[] refs = string.Equals(version, "master", StringComparison.Ordinal)

? [("master", false)]

: [(version, false), ("master", true)];

foreach (var (gitRef, isFallback) in refs)

{

var contents = new List<(string Name, string Content)>(SkillFiles.Length);

string? failure = null;

foreach (var file in SkillFiles)

{

var url = $"{BaseUrl}/{gitRef}/{RepoPath}/{file}";

try

{

using var response = await http.GetAsync(url);

if (response.IsSuccessStatusCode is false)

{

failure = $"{url}: {(int)response.StatusCode} {response.ReasonPhrase}";

break;

}

contents.Add((file, await response.Content.ReadAsStringAsync()));

}

catch (Exception ex) when (ex is HttpRequestException or TaskCanceledException)

{

failure = $"{url}: {ex.Message}";

break;

}

if (failure is not null)

{

Console.ForegroundColor = ConsoleColor.Yellow;

Console.Error.WriteLine(isFallback

? $"Could not download the skill from 'master': {failure}"

: $"Skill files for version branch '{gitRef}' are not available ({failure}); trying 'master'...");

Console.ResetColor();

continue;

}

Directory.CreateDirectory(targetDir);

foreach (var (name, content) in contents)

{

File.WriteAllText(Path.Combine(targetDir, name), content);

Console.WriteLine($" {name}");

}

Console.WriteLine();

Console.ForegroundColor = ConsoleColor.Green;

Console.WriteLine($"Installed the NpgsqlRest Claude Code skill ({gitRef}) into {targetDir}");

Console.ResetColor();

if (isFallback)

{

Console.ForegroundColor = ConsoleColor.Yellow;

Console.WriteLine($"Note: installed from 'master' because the '{version}' branch was not available - references may not exactly match this version. The skill instructs the agent to trust the installed binary (--config, --annotations) when they differ.");

Console.ResetColor();

}

if (global is false)

{

Console.WriteLine("Commit the .claude/skills/npgsqlrest folder so the whole team (and CI agents) get the skill.");

}

return 0;

}

Console.ForegroundColor = ConsoleColor.Red;

Console.Error.WriteLine("Failed to install the Claude Code skill. Check network access to raw.githubusercontent.com and try again.");

Console.ResetColor();

return 1;

}

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