ac89bb064a
All OS and IO operations should be moved out, leaving only some misc portable pure functions. This is useful to avoid copious CPP when doing things like Windows and Emscripten ports. Newly exposed functions to break cycles: - `restoreSignals` - `updateWindowSize`
54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
#include "markdown.hh"
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#include "util.hh"
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#include "finally.hh"
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#include "terminal.hh"
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#include <sys/queue.h>
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#include <lowdown.h>
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namespace nix {
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std::string renderMarkdownToTerminal(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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.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), !shouldANSI());
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}
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}
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