mirror of
https://github.com/NixOS/nix.git
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84e2963f8e
This will facilitate breaking up Nix into multiple packages for each component with Meson.
73 lines
2 KiB
C++
73 lines
2 KiB
C++
#include "markdown.hh"
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#include "environment-variables.hh"
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#include "error.hh"
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#include "finally.hh"
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#include "terminal.hh"
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#if HAVE_LOWDOWN
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# include <sys/queue.h>
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# include <lowdown.h>
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#endif
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namespace nix {
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#if HAVE_LOWDOWN
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static std::string doRenderMarkdownToTerminal(std::string_view markdown)
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{
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int windowWidth = getWindowSize().second;
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struct lowdown_opts opts
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{
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.type = LOWDOWN_TERM,
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.maxdepth = 20,
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.cols = (size_t) std::max(windowWidth - 5, 60),
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.hmargin = 0,
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.vmargin = 0,
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.feat = LOWDOWN_COMMONMARK | LOWDOWN_FENCED | LOWDOWN_DEFLIST | LOWDOWN_TABLES,
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.oflags = LOWDOWN_TERM_NOLINK,
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};
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auto doc = lowdown_doc_new(&opts);
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if (!doc)
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throw Error("cannot allocate Markdown document");
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Finally freeDoc([&]() { lowdown_doc_free(doc); });
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size_t maxn = 0;
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auto node = lowdown_doc_parse(doc, &maxn, markdown.data(), markdown.size(), nullptr);
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if (!node)
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throw Error("cannot parse Markdown document");
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Finally freeNode([&]() { lowdown_node_free(node); });
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auto renderer = lowdown_term_new(&opts);
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if (!renderer)
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throw Error("cannot allocate Markdown renderer");
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Finally freeRenderer([&]() { lowdown_term_free(renderer); });
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auto buf = lowdown_buf_new(16384);
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if (!buf)
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throw Error("cannot allocate Markdown output buffer");
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Finally freeBuffer([&]() { lowdown_buf_free(buf); });
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int rndr_res = lowdown_term_rndr(buf, renderer, node);
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if (!rndr_res)
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throw Error("allocation error while rendering Markdown");
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return filterANSIEscapes(std::string(buf->data, buf->size), !isTTY());
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}
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std::string renderMarkdownToTerminal(std::string_view markdown)
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{
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if (auto e = getEnv("_NIX_TEST_RAW_MARKDOWN"); e && *e == "1")
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return std::string(markdown);
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else
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return doRenderMarkdownToTerminal(markdown);
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}
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#else
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std::string renderMarkdownToTerminal(std::string_view markdown)
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{
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return std::string(markdown);
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}
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#endif
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} // namespace nix
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