Lily Ballard
20fed838a6
Also replace links to `.md` files with the equivalent `.html` files. Change-Id: Id0000000f267872d021985daf2d833a93ec06e66
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
#include "lix/libcmd/markdown.hh"
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#include "lix/libutil/error.hh"
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#include "lix/libutil/finally.hh"
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#include "lix/libutil/terminal.hh"
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#include <cstdlib>
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#include <iterator>
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#include <new>
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#include <regex>
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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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static const std::string DOCROOT = "@docroot@";
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static const std::string DOCROOT_URL = "https://docs.lix.systems/manual/lix/stable";
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static void processLinks(struct lowdown_node * node)
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{
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if (node->type == LOWDOWN_LINK) {
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struct lowdown_buf *link = &node->rndr_link.link;
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if (link && link->size && std::string_view(link->data, link->size).starts_with(DOCROOT)) {
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// link starts with @docroot@, replace that and check the path extension too.
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static std::regex mdRewrite{"\\.md(#.*)?$"}; // NOLINT(lix-foreign-exceptions)
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auto oldLink = std::string_view(link->data, link->size).substr(DOCROOT.size());
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std::string newLink = DOCROOT_URL;
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std::regex_replace(
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std::back_inserter(newLink), oldLink.begin(), oldLink.end(), mdRewrite, ".html$1"
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);
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if (link->maxsize < newLink.size()) {
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// the existing link buffer doesn't have enough space for the new string
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char *newData;
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if (!(newData = static_cast<char *>(std::realloc(link->data, newLink.size())))) {
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throw std::bad_alloc();
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}
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link->data = newData;
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link->maxsize = newLink.size();
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}
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newLink.copy(link->data, newLink.size());
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link->size = newLink.size();
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}
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} else {
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// recurse into children
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struct lowdown_node *child;
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TAILQ_FOREACH(child, &node->children, entries)
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processLinks(child);
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}
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}
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std::string renderMarkdownToTerminal(std::string_view markdown, StandardOutputStream fileno)
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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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if (!shouldANSI(fileno)) {
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opts.oflags |= LOWDOWN_TERM_NOANSI;
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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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processLinks(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 std::string(buf->data, buf->size);
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}
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}
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