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Make usage info output responsive to the terminal width

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This commit is contained in:
Rangi42
2025-09-05 21:06:38 -04:00
parent 024b33b63a
commit 00b5077b2a
1 changed files with 42 additions and 7 deletions
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49
src/usage.cpp
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@@ -7,9 +7,30 @@
#include <stdlib.h>
#include "helpers.hpp"
#include "platform.hpp"
#include "style.hpp"
static constexpr size_t maxLineLen = 79;
#if defined(_MSC_VER) || defined(__MINGW32__)
#define WIN32_LEAN_AND_MEAN // Include less from `windows.h`
#include <windows.h>
#else
#include <sys/ioctl.h>
#endif
// Use the console window width minus 1 as the maximum line length for flags
static size_t maxLineLen = []() {
#if defined(_MSC_VER) || defined(__MINGW32__)
CONSOLE_SCREEN_BUFFER_INFO csbi;
GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi);
return csbi.srWindow.Right > csbi.srWindow.Left
? static_cast<size_t>(csbi.srWindow.Right - csbi.srWindow.Left)
: 79;
#else
struct winsize winSize;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &winSize);
return winSize.ws_col > 1 ? static_cast<size_t>(winSize.ws_col - 1) : 79;
#endif
}();
// LCOV_EXCL_START
@@ -34,6 +55,7 @@ void Usage::printAndExit(int code) const {
fprintf(file, " %s", flag.c_str());
flagsWidth += 1 + flag.length();
}
style_Reset(file);
fputs("\n\n", file);
// Measure the options' flags
@@ -50,12 +72,13 @@ void Usage::printAndExit(int code) const {
padOpts = pad;
}
}
int optIndent = static_cast<int>(literal_strlen(" ") + padOpts);
size_t optOffset = literal_strlen(" ") + padOpts;
// Print the options
if (!options.empty()) {
style_Set(file, STYLE_GREEN, true);
fputs("Useful options:\n", file);
style_Reset(file);
}
for (auto const &[opts, description] : options) {
fputs(" ", file);
@@ -64,23 +87,36 @@ void Usage::printAndExit(int code) const {
size_t optWidth = 0;
for (size_t i = 0; i < opts.size(); ++i) {
if (i > 0) {
style_Reset(file);
fputs(", ", file);
optWidth += literal_strlen(", ");
}
style_Set(file, STYLE_CYAN, false);
fputs(opts[i].c_str(), file);
style_Reset(file);
optWidth += opts[i].length();
}
if (optWidth < padOpts) {
// Measure the description lines
size_t descLen = 0;
for (std::string const &descLine : description) {
if (descLine.length() > descLen) {
descLen = descLine.length();
}
}
// If the description lines would wrap around the console, put them on their own lines
size_t optIndent = optOffset;
if (optIndent + literal_strlen(" ") + descLen > maxLineLen) {
optIndent = 6;
fprintf(file, "\n%*c", static_cast<int>(optIndent), ' ');
} else if (optWidth < padOpts) {
fprintf(file, "%*c", static_cast<int>(padOpts - optWidth), ' ');
}
// Print the description lines, indented to the same level
for (size_t i = 0; i < description.size(); ++i) {
style_Reset(file);
if (i > 0) {
fprintf(file, "\n%*c", optIndent, ' ');
fprintf(file, "\n%*c", static_cast<int>(optIndent), ' ');
}
fprintf(file, " %s", description[i].c_str());
}
@@ -88,7 +124,6 @@ void Usage::printAndExit(int code) const {
}
// Print the link for further help information
style_Reset(file);
fputs("\nFor more help, use \"", file);
style_Set(file, STYLE_CYAN, true);
fprintf(file, "man %s", name.c_str());