--- a/src/html.cpp Fri Feb 27 14:38:01 2026 +0100
+++ b/src/html.cpp Thu Mar 12 12:00:50 2026 +0100
@@ -27,18 +27,42 @@
#include <ranges>
#include <cstdio>
#include <cassert>
+#include <iostream>
using namespace std::chrono;
namespace html {
static constexpr const char* weekdays[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
+ struct output_reference {
+ FILE *file;
+ explicit output_reference(FILE *f) : file{f} {}
+ output_reference(output_reference const &) = delete;
+ output_reference(output_reference && other) noexcept : file(other.file) {
+ other.file = nullptr;
+ }
+ output_reference &operator=(output_reference const &) = delete;
+ output_reference &operator=(output_reference && other) noexcept {
+ using std::swap;
+ swap(other.file, file);
+ return *this;
+ }
+ ~output_reference() {
+ if (file != nullptr && file != stdout) {
+ fclose(file);
+ file = nullptr;
+ }
+ }
+ };
+
+ static output_reference output{stdout};
+
static unsigned indentation;
static const char *tabs = " ";
static void indent(int change = 0) {
indentation += change;
assert(indentation <= max_indentation);
- fwrite(tabs, 4, indentation, stdout);
+ fwrite(tabs, 4, indentation, output.file);
}
static std::string encode(const std::string &data) {
@@ -158,8 +182,21 @@
}
}
+int html::set_output(std::string const &path) {
+ if (path.empty()) {
+ output = output_reference{stdout};
+ return 0;
+ }
+ FILE * f = fopen(path.c_str(), "w");
+ if (f == nullptr) {
+ return -1;
+ }
+ output = output_reference{f};
+ return 0;
+}
+
void html::styles_and_script() {
- puts(R"( <style>
+ fputs(R"( <style>
table.heatmap {
table-layout: fixed;
border-collapse: separate;
@@ -387,23 +424,27 @@
}
});
});
- </script>)");
+ </script>
+)", output.file);
}
void html::open(bool fragment, unsigned char fragment_indent) {
+ indentation = 0;
if (fragment) {
indent(fragment_indent);
- puts("<div class=\"heatmap-content\">");
+ fputs("<div class=\"heatmap-content\">\n", output.file);
indentation++;
} else {
- puts(R"(<!DOCTYPE html>
+ fputs(R"(<!DOCTYPE html>
<html>
<head>
- <meta charset="UTF-8">)");
+ <meta charset="UTF-8">
+)", output.file);
styles_and_script();
- puts(R"( </head>
+ fputs(R"( </head>
<body>
- <div class="heatmap-content">)");
+ <div class="heatmap-content">
+)", output.file);
indentation = 3;
}
}
@@ -411,32 +452,33 @@
void html::close(bool fragment) {
if (fragment) {
indent(-1);
- puts("</div>");
+ fputs("</div>\n", output.file);
} else {
- puts(" </div>\n </body>\n</html>");
+ fputs(" </div>\n </body>\n</html>\n", output.file);
}
}
void html::chart_begin(const std::string& repo, const std::string& author) {
indent();
- printf("<div class=\"chart\" data-repo=\"%s\" data-author=\"%s\">\n",
+ fprintf(output.file,
+ "<div class=\"chart\" data-repo=\"%s\" data-author=\"%s\">\n",
encode(repo).c_str(), encode(author).c_str());
indentation++;
}
void html::chart_end() {
indent(-1);
- puts("</div>");
+ fputs("</div>\n", output.file);
}
void html::heading_repo(const std::string& repo) {
indent();
- printf("<h1 data-repo=\"%1$s\">%1$s</h1>\n", encode(repo).c_str());
+ fprintf(output.file, "<h1 data-repo=\"%1$s\">%1$s</h1>\n", encode(repo).c_str());
}
void html::heading_author(const std::string& author, unsigned int total_commits) {
indent();
- printf("<h2 title=\"Total commits: %u\">%s</h2>\n",
+ fprintf(output.file, "<h2 title=\"Total commits: %u\">%s</h2>\n",
total_commits,
encode(author).c_str());
}
@@ -459,11 +501,11 @@
// now render the table heading
indent();
- puts("<table class=\"heatmap\">");
+ fputs("<table class=\"heatmap\">\n", output.file);
indent(1);
- puts("<tr>");
+ fputs("<tr>\n", output.file);
indent(1);
- puts("<th></th>");
+ fputs("<th></th>\n", output.file);
for (unsigned i = 0 ; i < 12 ; i++) {
indent();
const fm::commit_summary &summary = commits_per_month[i];
@@ -483,39 +525,41 @@
commit_summary = std::format("data-commits=\"{}\"", encode(commit_summary_json));
}
std::string tags = build_tag_summary(summary.tags_with_date, hide_repo_names);
- printf("<th scope=\"col\" title=\"Total commits: %u\" colspan=\"%d\" data-total=\"%u\" %s data-tags=\"%s\">%s</th>\n",
+ fprintf(output.file,
+ "<th scope=\"col\" title=\"Total commits: %u\" colspan=\"%d\" data-total=\"%u\" %s data-tags=\"%s\">%s</th>\n",
total, colspans[i], total,
commit_summary.c_str(),
encode(tags).c_str(), months[i]);
} else {
- printf("<th scope=\"col\" class=\"zero-commits\" colspan=\"%d\">%s</th>\n",
+ fprintf(output.file,
+ "<th scope=\"col\" class=\"zero-commits\" colspan=\"%d\">%s</th>\n",
colspans[i], months[i]);
}
}
indent(-1);
- puts("</tr>");
+ fputs("</tr>\n", output.file);
}
void html::table_end() {
indent(-1);
- puts("</table>");
+ fputs("</table>\n", output.file);
}
void html::row_begin(unsigned int row) {
indent();
- puts("<tr>");
+ fputs("<tr>\n", output.file);
indent(1);
- printf("<th scope=\"row\">%s</th>\n", weekdays[row]);
+ fprintf(output.file, "<th scope=\"row\">%s</th>\n", weekdays[row]);
}
void html::row_end() {
indent(-1);
- puts("</tr>");
+ fputs("</tr>\n", output.file);
}
void html::cell_out_of_range() {
indent();
- puts("<td class=\"out-of-range\"></td>");
+ fputs("<td class=\"out-of-range\"></td>\n", output.file);
}
void html::cell(year_month_day ymd, bool hide_repo_names, const fm::commits &commits) {
@@ -573,7 +617,8 @@
static_cast<unsigned>(ymd.day()));
const unsigned total = commits.count();
indent();
- printf("<td class=\"%s\" title=\"%s: %u %s\" data-total=\"%u\" data-date=\"%s\" data-summaries=\"%s\" data-tags=\"%s\"></td>\n",
+ fprintf(output.file,
+ "<td class=\"%s\" title=\"%s: %u %s\" data-total=\"%u\" data-date=\"%s\" data-summaries=\"%s\" data-tags=\"%s\"></td>\n",
color_class,
date_str.c_str(),
total,