feat(agents): keep dependencies' AGENTS.consumer.md in AGENTS.md
An agent working on a crafter-build project reads its AGENTS.md, and learns nothing there about the libraries the project builds against unless someone copied that in by hand. This repository shows the cost: the code style section of its AGENTS.md restates what Crafter.LintRules enforces, and goes stale whenever the rules change. A library now ships those notes itself, as AGENTS.consumer.md beside its project.cpp; nothing in its project.cpp changes. When a consumer has an AGENTS.md beside its own project.cpp, `crafter-build` and `crafter-build test` keep a section in it, between two marker comments, holding its dependencies' notes. The section is appended the first time and rewritten in place after that. The file is written only when the section changes, and an AGENTS.md is never created. lint, format, run and clean leave it alone. The update runs after loading, which has just fetched every dependency, and before compiling, so a build that fails still has the notes. cfg.dependencyNotes picks the dependencies. Transitive, the default, follows `dependencies` all the way down from the project's own configurations, its tests and its `#pragma crafter dependency` tooling; Direct stops at the first loaded project on each path; None removes the section. A dependency's own pragma tooling never counts: it is about how that dependency is built, not how it is used, and being no `dependencies` edge it is never reached. Nor are a dependency's tests: nothing builds them for the consumer, and their configurations can point at a local their project file has since moved out of. The walk has to know which Configurations belong to another project, and where that project lives, and cfg.path cannot say: only the Configuration GitProject and LocalProject return is rebased, so a dependency's internal configurations keep "./", which resolves to the consumer. The loader records it instead, LoadedProjectOf beside the project cache, and keeps what the root's pragmas resolved to past the frame LoadProject pops, PragmaDependencies. Neither is exported. The markers count only as whole lines outside fenced code blocks, so documentation can quote them. Unbalanced markers and a document ending inside a code block leave the file alone with a warning: guessing which part of someone's file is generated would overwrite their text, and missing the section would add another one on every build. A note that would break the section when it is read back, through a marker line of its own or a code block it never closes, is left out with a warning. The file is replaced through a temporary renamed onto the symlink's target, so a linked AGENTS.md stays a link and a write cut short leaves the old file rather than part of the new one. The code is a new partition, Crafter.Build:Agents, listed in build.sh, CrafterBuildModules, project.cpp and the umbrella. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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12 changed files with 475 additions and 4 deletions
320
implementations/Crafter.Build-Agents.cpp
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320
implementations/Crafter.Build-Agents.cpp
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@ -0,0 +1,320 @@
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// SPDX-License-Identifier: LGPL-3.0-only
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// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
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module;
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#include <unistd.h>
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module Crafter.Build:Agents_impl;
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import std;
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import :Agents;
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import :Clang;
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import :External;
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import :Platform;
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import :Progress;
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namespace fs = std::filesystem;
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using namespace Crafter;
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namespace {
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constexpr std::string_view BeginMarker = "<!-- crafter-build: dependency notes begin -->";
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constexpr std::string_view EndMarker = "<!-- crafter-build: dependency notes end -->";
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// Right under the begin marker, for whoever opens the file: an edit made
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// inside the section is gone after the next build.
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constexpr std::string_view Preamble = "<!-- Written by crafter-build from the AGENTS.consumer.md each dependency ships, and rewritten on every build. Edit those files, not this section; cfg.dependencyNotes in project.cpp picks which dependencies are included. -->";
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constexpr std::string_view NotesFileName = "AGENTS.consumer.md";
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void Warn(std::string_view message) {
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Progress::Diagnostic(std::format("warning: {}", message));
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}
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struct Line {
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std::string_view text; // without the newline and a '\r' before it
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std::size_t begin = 0; // offset of the line's first byte
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std::size_t next = 0; // offset of the line after it
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};
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std::vector<Line> SplitLines(std::string_view text) {
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std::vector<Line> lines;
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std::size_t pos = 0;
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while (pos < text.size()) {
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const std::size_t newline = text.find('\n', pos);
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const std::size_t end = newline == std::string_view::npos ? text.size() : newline;
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std::string_view line = text.substr(pos, end - pos);
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if (line.ends_with('\r')) line.remove_suffix(1);
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const std::size_t next = newline == std::string_view::npos ? text.size() : newline + 1;
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lines.push_back({ .text = line, .begin = pos, .next = next });
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pos = next;
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}
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return lines;
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}
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std::string_view TrimEnd(std::string_view text) {
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const std::size_t last = text.find_last_not_of(" \t");
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return last == std::string_view::npos ? std::string_view() : text.substr(0, last + 1);
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}
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// Fenced code blocks as CommonMark has them: a run of three or more
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// backticks or tildes, after at most three spaces, opens one, and a run
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// of the same character at least as long, with nothing after it but
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// spaces, closes it. Tracking the character and the length is what lets
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// a ~~~ block quote a ``` one, the usual way to show a fenced example.
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class CodeFences {
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public:
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// Feed the lines in order. True for a fence and for every line
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// inside a block.
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bool InCode(std::string_view line) {
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std::size_t pos = 0;
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while (pos < line.size() && pos < 3 && line[pos] == ' ') ++pos;
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const char ch = pos < line.size() ? line[pos] : '\0';
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std::size_t run = 0;
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if (ch == '`' || ch == '~') {
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while (pos + run < line.size() && line[pos + run] == ch) ++run;
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}
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const bool fence = run >= 3;
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if (open_ == '\0') {
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if (!fence) return false;
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open_ = ch;
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length_ = run;
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return true;
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}
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if (fence && ch == open_ && run >= length_ && TrimEnd(line.substr(pos + run)).empty()) open_ = '\0';
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return true;
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}
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bool Open() const { return open_ != '\0'; }
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private:
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char open_ = '\0';
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std::size_t length_ = 0;
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};
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// Where a text's marker lines are, outside code blocks, as indices into
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// `lines`.
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struct MarkerScan {
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std::vector<Line> lines;
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std::vector<std::size_t> begins;
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std::vector<std::size_t> ends;
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// The line a code block that never closes opens on.
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std::optional<std::size_t> unclosedBlock;
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};
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MarkerScan ScanMarkers(std::string_view text) {
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MarkerScan scan;
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scan.lines = SplitLines(text);
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CodeFences fences;
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for (std::size_t i = 0; i < scan.lines.size(); ++i) {
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const bool wasOpen = fences.Open();
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if (fences.InCode(scan.lines[i].text)) {
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if (!wasOpen) scan.unclosedBlock = i;
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continue;
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}
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const std::string_view line = TrimEnd(scan.lines[i].text);
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if (line == BeginMarker) scan.begins.push_back(i);
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if (line == EndMarker) scan.ends.push_back(i);
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}
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if (!fences.Open()) scan.unclosedBlock.reset();
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return scan;
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}
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// Why `text` cannot go into the section as it is; empty when it can. A
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// marker line of its own would end or restart the section once the file
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// is read back, and a code block left open would hide the end marker:
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// either way the next build could no longer find what this one wrote.
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std::string NoteProblem(std::string_view text) {
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const MarkerScan scan = ScanMarkers(text);
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if (!scan.begins.empty() || !scan.ends.empty()) {
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std::size_t line = scan.lines.size();
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if (!scan.begins.empty()) line = scan.begins[0];
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if (!scan.ends.empty()) line = std::min(line, scan.ends[0]);
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return std::format("line {} is a dependency notes marker", line + 1);
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}
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if (scan.unclosedBlock) return std::format("line {} opens a code block that never closes", *scan.unclosedBlock + 1);
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return "";
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}
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std::string RenderSection(std::span<const DependencyNote> notes) {
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std::string section = std::format("{}\n{}\n", BeginMarker, Preamble);
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for (const DependencyNote& note : notes) section += std::format("\n<!-- from {} -->\n{}\n", note.source, note.text);
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section += std::format("\n{}\n", EndMarker);
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return section;
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}
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// Without leading blank lines and trailing whitespace, so the section
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// spaces its notes the same whatever the files end with.
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std::string TrimBlank(std::string_view text) {
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const std::size_t last = text.find_last_not_of(" \t\r\n");
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if (last == std::string_view::npos) return "";
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const std::size_t first = text.find_first_not_of(" \t\r\n");
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const std::size_t newline = text.rfind('\n', first);
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const std::size_t begin = newline == std::string_view::npos ? 0 : newline + 1;
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return std::string(text.substr(begin, last + 1 - begin));
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}
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std::optional<std::string> ReadFile(const fs::path& file) {
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std::ifstream in(file, std::ios::binary);
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if (!in) return std::nullopt;
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std::string content((std::istreambuf_iterator<char>(in)), std::istreambuf_iterator<char>());
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if (in.bad()) return std::nullopt;
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return content;
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}
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// Replace the content of `file` through a temporary beside it: a write
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// cut short (a full disk, a crash) leaves the old AGENTS.md rather than
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// part of the new one, and a reader never sees a half-written file. The
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// rename lands on the symlink's target, so an AGENTS.md that is a link
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// stays one, and the target's permissions are carried over.
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bool ReplaceFile(const fs::path& file, std::string_view content) {
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std::error_code ec;
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const fs::path target = fs::canonical(file, ec);
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if (ec) return false;
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const fs::path temporary = target.parent_path() / std::format(".{}.{}.tmp", target.filename().string(), getpid());
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{
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std::ofstream out(temporary, std::ios::binary | std::ios::trunc);
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out.write(content.data(), static_cast<std::streamsize>(content.size()));
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out.close();
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if (!out) {
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fs::remove(temporary, ec);
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return false;
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}
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}
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if (const fs::file_status status = fs::status(target, ec); !ec) fs::permissions(temporary, status.permissions(), ec);
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fs::rename(temporary, target, ec);
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if (ec) {
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std::error_code ignored;
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fs::remove(temporary, ignored);
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return false;
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}
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return true;
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}
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// The note in `file`, beside the project file of a dependency loaded
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// from `url` (empty for a local one); nullopt when there is none or it
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// cannot be used.
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std::optional<DependencyNote> ReadNote(const fs::path& file, const std::string& url, const fs::path& projectDir) {
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std::error_code ec;
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if (!fs::is_regular_file(file, ec)) return std::nullopt;
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const std::optional<std::string> content = ReadFile(file);
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if (!content) {
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Warn(std::format("{} could not be read, so its notes are left out", file.string()));
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return std::nullopt;
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}
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std::string text = TrimBlank(*content);
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if (text.empty()) return std::nullopt;
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// On the file as it is, so the line numbers are the author's.
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if (const std::string problem = NoteProblem(*content); !problem.empty()) {
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Warn(std::format("{}: {}, so its notes are left out", file.string(), problem));
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return std::nullopt;
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}
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// A URL names the dependency the same on every machine, which a path
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// into the cache or a sibling checkout does not, and the section is
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// committed along with the rest of AGENTS.md.
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std::string source = url.empty() ? file.lexically_relative(projectDir).generic_string() : url;
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return DependencyNote{ .source = std::move(source), .text = std::move(text) };
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}
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// The AGENTS.consumer.md of every project `project` depends on, as
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// project.dependencyNotes selects them. Breadth-first from the project's
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// `#pragma crafter dependency` targets, its dependencies and its tests'
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// dependencies, so the projects it names itself come first, in the
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// order it names them, and a library several of them use is described
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// once, where it is first reached.
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//
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// A loaded project, one that GitProject or LocalProject returned,
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// contributes the file beside its project file. Every other
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// Configuration, the project's own library or a dependency's internal
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// one, is only walked through. Direct stops at the first loaded project
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// on each path. A dependency's own pragma tooling is never reached,
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// being no `dependencies` edge, and a dependency's tests are never
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// walked: nothing builds them for the consumer, and they may point at a
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// Configuration their project file has since moved out of.
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std::vector<DependencyNote> CollectNotes(const Configuration& project, const fs::path& absProject) {
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const fs::path projectDir = absProject.parent_path();
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std::deque<const Configuration*> queue;
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// Seen from the start: a test may list the project itself.
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std::unordered_set<const Configuration*> seen = { &project };
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auto enqueue = [&](const Configuration* cfg) {
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if (cfg && seen.insert(cfg).second) queue.push_back(cfg);
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};
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for (const Configuration* dep : PragmaDependencies(absProject)) enqueue(dep);
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for (const Configuration* dep : project.dependencies) enqueue(dep);
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for (const Test& test : project.tests) {
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for (const Configuration* dep : test.config.dependencies) enqueue(dep);
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}
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std::vector<DependencyNote> notes;
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std::unordered_set<fs::path> files;
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while (!queue.empty()) {
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const Configuration* cfg = queue.front();
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queue.pop_front();
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if (const std::optional<LoadedProject> loaded = LoadedProjectOf(*cfg)) {
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const fs::path file = loaded->projectFile.parent_path() / NotesFileName;
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if (files.insert(file).second) {
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if (std::optional<DependencyNote> note = ReadNote(file, loaded->url, projectDir)) notes.push_back(std::move(*note));
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}
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if (project.dependencyNotes == DependencyNotes::Direct) continue;
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}
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for (const Configuration* dep : cfg->dependencies) enqueue(dep);
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}
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return notes;
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}
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}
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std::string Crafter::MergeDependencyNotes(std::string_view agentsMd, std::span<const DependencyNote> notes) {
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for (const DependencyNote& note : notes) {
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if (const std::string problem = NoteProblem(note.text); !problem.empty()) throw std::runtime_error(std::format("the notes from {}: {}", note.source, problem));
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}
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const MarkerScan scan = ScanMarkers(agentsMd);
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if (scan.unclosedBlock) throw std::runtime_error(std::format("line {}: a code block opens here and never closes", *scan.unclosedBlock + 1));
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if (scan.begins.size() > 1) throw std::runtime_error(std::format("line {}: a second dependency notes begin marker (the first is on line {})", scan.begins[1] + 1, scan.begins[0] + 1));
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if (scan.ends.size() > 1) throw std::runtime_error(std::format("line {}: a second dependency notes end marker (the first is on line {})", scan.ends[1] + 1, scan.ends[0] + 1));
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if (!scan.ends.empty() && (scan.begins.empty() || scan.ends[0] < scan.begins[0])) throw std::runtime_error(std::format("line {}: a dependency notes end marker with no begin marker before it", scan.ends[0] + 1));
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if (!scan.begins.empty() && scan.ends.empty()) throw std::runtime_error(std::format("line {}: a dependency notes begin marker with no end marker after it", scan.begins[0] + 1));
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const std::string section = notes.empty() ? std::string() : RenderSection(notes);
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if (scan.begins.empty()) {
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if (notes.empty()) return std::string(agentsMd);
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std::string merged(agentsMd);
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if (!merged.empty()) merged += merged.ends_with('\n') ? "\n" : "\n\n";
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return merged + section;
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}
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std::string_view before = agentsMd.substr(0, scan.lines[scan.begins[0]].begin);
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const std::string_view after = agentsMd.substr(scan.lines[scan.ends[0]].next);
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// The blank line the section was appended after goes with it.
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if (notes.empty() && before.ends_with("\n\n")) before.remove_suffix(1);
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return std::format("{}{}{}", before, section, after);
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}
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bool Crafter::UpdateAgentsMd(const Configuration& project, const fs::path& projectFile) {
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std::error_code ec;
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const fs::path absProject = fs::canonical(projectFile, ec);
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if (ec) return false;
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const fs::path agents = absProject.parent_path() / "AGENTS.md";
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if (!fs::is_regular_file(agents, ec)) return false;
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const std::optional<std::string> current = ReadFile(agents);
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if (!current) {
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Warn(std::format("{} could not be read, so its dependency notes were not updated", agents.string()));
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return false;
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}
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const std::vector<DependencyNote> notes = project.dependencyNotes == DependencyNotes::None ? std::vector<DependencyNote>() : CollectNotes(project, absProject);
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std::string merged;
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try {
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merged = MergeDependencyNotes(*current, notes);
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} catch (const std::exception& e) {
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Warn(std::format("{}: {}, so its dependency notes were not updated", agents.string(), e.what()));
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return false;
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}
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if (merged == *current) return false;
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if (!ReplaceFile(agents, merged)) {
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Warn(std::format("{} could not be written, so its dependency notes were not updated", agents.string()));
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return false;
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}
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// A build that edits a file the user commits says so.
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if (Progress::GetVerbosity() != Progress::Verbosity::Quiet) {
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Progress::Clear();
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if (notes.empty()) {
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std::println("Removed the dependency notes from {}", agents.string());
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} else {
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std::println("Updated the dependency notes in {} ({} {})", agents.string(), notes.size(), notes.size() == 1 ? "dependency" : "dependencies");
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}
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}
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return true;
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}
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@ -13,6 +13,7 @@ import :Toolchain;
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import :Test;
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import :Lint;
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import :Script;
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import :Agents;
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import :Progress;
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import :Asset;
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namespace fs = std::filesystem;
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@ -1699,6 +1700,13 @@ Clean (after the `clean` subcommand):
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so it works when the project itself no longer compiles. Every target, variant
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and dependency artifact under those trees goes with it.
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AGENTS.md:
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When an AGENTS.md sits beside the project file, a build and `test` keep a
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section in it holding the AGENTS.consumer.md each dependency ships beside its
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project.cpp, and write the file only when that section changes. An AGENTS.md
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is never created. cfg.dependencyNotes picks the dependencies: Transitive (the
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default), Direct, or None, which removes the section.
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Project args:
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Any flag not consumed above is forwarded verbatim to CrafterBuildProject as
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part of its `args` span. Project-specific flags (e.g. --target=, custom
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@ -1867,6 +1875,13 @@ std::int32_t Crafter::Run(std::int32_t argc, char** argv) {
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return lintOpts.mode == LintMode::Check && !lintSummary.changedFiles.empty() ? 1 : 0;
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}
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// Builds and test runs only: lint and `format --check` promise to
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// write nothing, `format` rewrites the project's sources and nothing
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// else, and `run` is for chores. Here, before compiling, because
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// loading has just fetched every dependency, so the notes are
|
||||
// current, and an agent fixing a build that fails needs them.
|
||||
UpdateAgentsMd(config, projectFile);
|
||||
|
||||
if (runTests) {
|
||||
TestSummary summary = RunTests(config, testOpts, projectArgs);
|
||||
return summary.AllPassed() ? 0 : 1;
|
||||
|
|
|
|||
|
|
@ -327,6 +327,10 @@ ExternalBuildResult Crafter::BuildExternal(const ExternalDependency& dep, std::s
|
|||
namespace {
|
||||
std::mutex ProjectCacheMutex;
|
||||
std::unordered_map<std::string, std::unique_ptr<Configuration>> ProjectCache;
|
||||
// Keyed by the Configurations ProjectCache owns, which live as long as
|
||||
// the process does, so the pointers never dangle. Guarded by
|
||||
// ProjectCacheMutex as well.
|
||||
std::unordered_map<const Configuration*, LoadedProject> LoadedProjects;
|
||||
|
||||
// Run the dep's project.cpp from its own directory so its relative paths
|
||||
// (cfg.path = "./", interfaces/, lib/, ...) resolve against the dep
|
||||
|
|
@ -415,6 +419,7 @@ Configuration* Crafter::GitProject(const GitProjectSpec& spec) {
|
|||
auto stored = std::make_unique<Configuration>(std::move(cfg));
|
||||
Configuration* ptr = stored.get();
|
||||
ProjectCache.emplace(std::move(fullHash), std::move(stored));
|
||||
LoadedProjects.emplace(ptr, LoadedProject{ .projectFile = projectPath.lexically_normal(), .url = spec.source.url });
|
||||
return ptr;
|
||||
}
|
||||
|
||||
|
|
@ -477,5 +482,12 @@ Configuration* Crafter::LocalProject(const LocalProjectSpec& spec) {
|
|||
auto stored = std::make_unique<Configuration>(std::move(cfg));
|
||||
Configuration* ptr = stored.get();
|
||||
ProjectCache.emplace(std::move(fullHash), std::move(stored));
|
||||
LoadedProjects.emplace(ptr, LoadedProject{ .projectFile = canonical, .url = "" });
|
||||
return ptr;
|
||||
}
|
||||
|
||||
std::optional<LoadedProject> Crafter::LoadedProjectOf(const Configuration& cfg) {
|
||||
std::lock_guard lock(ProjectCacheMutex);
|
||||
if (auto it = LoadedProjects.find(&cfg); it != LoadedProjects.end()) return it->second;
|
||||
return std::nullopt;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -422,6 +422,13 @@ namespace {
|
|||
// the stack is per thread. ProjectDependency() reads the top frame.
|
||||
thread_local std::vector<ProjectFileFrame> LoadingFrames;
|
||||
|
||||
// A frame's dependencies, kept past the frame for PragmaDependencies().
|
||||
// Process-wide rather than per thread: whoever asks need not be the
|
||||
// thread that loaded the file. The Configurations live in the project
|
||||
// cache, which outlives every load.
|
||||
std::mutex PragmaDependenciesMutex;
|
||||
std::unordered_map<fs::path, std::vector<Configuration*>> PragmaDependenciesByProject;
|
||||
|
||||
// Held for the whole of one LoadProject call. Pushing a file that is
|
||||
// already on the stack is a cycle, which used to recurse forever.
|
||||
class ProjectFileGuard {
|
||||
|
|
@ -580,6 +587,15 @@ bool Crafter::IsTopLevelProject() {
|
|||
return LoadingFrames.size() <= 1;
|
||||
}
|
||||
|
||||
std::vector<Configuration*> Crafter::PragmaDependencies(const fs::path& projectFile) {
|
||||
std::error_code ec;
|
||||
const fs::path absProject = fs::canonical(projectFile, ec);
|
||||
if (ec) return {};
|
||||
std::lock_guard lock(PragmaDependenciesMutex);
|
||||
if (auto it = PragmaDependenciesByProject.find(absProject); it != PragmaDependenciesByProject.end()) return it->second;
|
||||
return {};
|
||||
}
|
||||
|
||||
namespace {
|
||||
// The one reading of a wait status (pclose, system) for every helper
|
||||
// that runs a command: a signal death is reported the way a shell
|
||||
|
|
@ -823,13 +839,14 @@ std::string Crafter::GetBaseCommand(const Configuration& config) {
|
|||
}
|
||||
|
||||
namespace {
|
||||
constexpr std::array<std::string_view, 13> CrafterBuildModules = {
|
||||
constexpr std::array<std::string_view, 14> CrafterBuildModules = {
|
||||
"Crafter.Build-Toolchain",
|
||||
"Crafter.Build-Shader",
|
||||
"Crafter.Build-Platform",
|
||||
"Crafter.Build-Interface",
|
||||
"Crafter.Build-Implementation",
|
||||
"Crafter.Build-External",
|
||||
"Crafter.Build-Agents",
|
||||
"Crafter.Build-Clang",
|
||||
"Crafter.Build-Test",
|
||||
"Crafter.Build-Lint",
|
||||
|
|
@ -966,6 +983,10 @@ Configuration Crafter::LoadProject(const fs::path& projectFile, std::span<const
|
|||
throw std::runtime_error(std::format("CrafterBuildProject not found in {}: {}", soPath.string(), err));
|
||||
}
|
||||
|
||||
{
|
||||
std::lock_guard lock(PragmaDependenciesMutex);
|
||||
PragmaDependenciesByProject[absProject] = preDeps.configs;
|
||||
}
|
||||
guard.Frame().dependencies = std::move(preDeps.configs);
|
||||
return fn(args);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue