d0e34c85f8
We upgrade to lowdown 0.8.0 [1] which contains a fix/improvement to a
behavior mentioned in this issue thread [2] where a big part of
lowdown's API would just call exit(1) on allocation errors since that
is a satisfying behavior for the lowdown binary.
Now lowdown_term_rndr returns 0 if an allocation error occurred which we
check for in libcmd/markdown.cc.
Also the extern "C" { } wrapper around lowdown.h has been removed as it
is not necessary.
[1]: 6ca7c855a0/versions.xml (L987-L1006)
[2]: https://github.com/kristapsdz/lowdown/issues/45#issuecomment-756681153
51 lines
1.4 KiB
C++
51 lines
1.4 KiB
C++
#include "markdown.hh"
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#include "util.hh"
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#include "finally.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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struct lowdown_opts opts {
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.type = LOWDOWN_TERM,
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.maxdepth = 20,
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.cols = std::min(getWindowSize().second, (unsigned short) 80),
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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 = 0,
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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());
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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, nullptr, 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 std::string(buf->data, buf->size);
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}
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}
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