userspace: Implement program launcher
This is kinda useless as I only have Terminal and test-window implemented. Also the code is really messy as I don't have GUI widgets.
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57f6f50939
commit
09745a7835
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@ -24,6 +24,7 @@ set(USERSPACE_PROGRAMS
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mkdir
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nslookup
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poweroff
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ProgramLauncher
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resolver
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rm
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Shell
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@ -0,0 +1,12 @@
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set(SOURCES
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main.cpp
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)
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add_executable(ProgramLauncher ${SOURCES})
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banan_link_library(ProgramLauncher ban)
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banan_link_library(ProgramLauncher libc)
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banan_link_library(ProgramLauncher libfont)
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banan_link_library(ProgramLauncher libgui)
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banan_link_library(ProgramLauncher libinput)
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install(TARGETS ProgramLauncher OPTIONAL)
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@ -0,0 +1,344 @@
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#include <BAN/HashSet.h>
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#include <BAN/Sort.h>
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#include <BAN/UTF8.h>
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#include <BAN/Vector.h>
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#include <LibFont/Font.h>
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#include <LibGUI/Window.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static constexpr uint32_t s_line_chars = 64;
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static constexpr uint32_t s_list_height = 15;
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static constexpr uint32_t s_padding = 3;
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static constexpr uint32_t s_margin = 5;
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static constexpr uint32_t s_separator_h = 2;
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static constexpr uint32_t s_scroll_w = 10;
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static constexpr uint32_t s_scroll_h_min = 5;
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static constexpr uint32_t s_color_bg1 = 0xCC'404040;
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static constexpr uint32_t s_color_bg2 = 0xCC'606060;
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static constexpr uint32_t s_color_selected = 0xCC'0000FF;
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static constexpr uint32_t s_color_text = 0xCC'FFFFFF;
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static constexpr uint32_t s_color_separator = 0xCC'FFFFFF;
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static constexpr uint32_t s_color_scroll = 0xCC'808080;
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static uint32_t line_w(const LibFont::Font& font)
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{
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return s_line_chars * font.width() + 2 * s_padding;
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}
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static uint32_t line_h(const LibFont::Font& font)
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{
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return font.height() + 2 * s_padding;
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}
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static const BAN::Vector<BAN::String> get_program_list()
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{
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BAN::HashSet<BAN::String> paths;
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if (const char* path_env = getenv("PATH"))
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{
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auto path_env_copy = BAN::String(path_env);
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const char* token = strtok(path_env_copy.data(), ":");
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do
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MUST(paths.insert(BAN::StringView(token)));
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while ((token = strtok(nullptr, ":")));
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}
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BAN::HashSet<BAN::String> program_set;
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for (const auto& path : paths)
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{
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DIR* dirp = opendir(path.data());
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if (dirp == nullptr)
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continue;
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dirent* dent;
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while ((dent = readdir(dirp)))
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{
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if (dent->d_type != DT_REG && dent->d_type != DT_LNK)
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continue;
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struct stat st;
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if (fstatat(dirfd(dirp), dent->d_name, &st, 0) == -1)
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continue;
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if (!S_ISREG(st.st_mode))
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continue;
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if (!(st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)))
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continue;
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MUST(program_set.insert(BAN::String(dent->d_name)));
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}
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closedir(dirp);
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}
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BAN::Vector<BAN::String> programs;
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MUST(programs.reserve(program_set.size()));
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for (auto& program : program_set)
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MUST(programs.emplace_back(BAN::move(program)));
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BAN::sort::sort(programs.begin(), programs.end(),
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[](const auto& a, const auto& b) -> bool
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{
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const size_t min_size = BAN::Math::min(a.size(), b.size());
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for (size_t i = 0; i < min_size; i++)
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if (a[i] != b[i])
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return a[i] < b[i];
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return a.size() < b.size();
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}
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);
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return programs;
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}
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static BAN::Vector<BAN::StringView> get_filtered_program_list(BAN::Span<BAN::String> program_list, BAN::StringView prompt)
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{
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BAN::Vector<BAN::StringView> filtered_list;
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for (const auto& program : program_list)
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{
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for (size_t i = 0; i + prompt.size() <= program.size(); i++)
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{
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bool match = true;
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for (size_t j = 0; j < prompt.size() && match; j++)
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if (tolower(prompt[j]) != tolower(program[i + j]))
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match = false;
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if (!match)
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continue;
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MUST(filtered_list.push_back(program.sv()));
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break;
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}
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}
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return filtered_list;
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}
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void render_search_box(LibGUI::Texture& texture, const LibFont::Font& font, BAN::StringView prompt)
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{
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char buffer[s_line_chars + 1];
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snprintf(buffer, sizeof(buffer), "search: %.*s", (int)prompt.size(), prompt.data());
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texture.fill(s_color_bg1);
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texture.draw_text(buffer, font, s_padding, s_padding, s_color_text);
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}
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void render_list(LibGUI::Texture& texture, const LibFont::Font& font, BAN::Span<BAN::StringView> programs, size_t selected)
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{
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texture.fill(s_color_bg1);
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const size_t start = selected / s_list_height * s_list_height;
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const size_t count = BAN::Math::min<size_t>(s_list_height, programs.size() - start);
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const uint32_t line_w = ::line_w(font);
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const uint32_t line_h = ::line_h(font);
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for (size_t i = 0; i < count; i++)
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{
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uint32_t color = (i % 2) ? s_color_bg2 : s_color_bg1;
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if (start + i == selected)
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color = s_color_selected;
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texture.fill_rect(0, line_h * i, line_w, line_h, color);
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texture.draw_text(programs[start + i], font, s_padding, s_padding + line_h * i, s_color_text);
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}
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}
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void render_scroll(LibGUI::Texture& texture, BAN::Span<BAN::StringView> programs, size_t selected)
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{
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texture.fill(s_color_bg1);
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if (programs.empty())
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return;
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texture.fill_rect(
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s_padding,
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texture.height() * selected / programs.size(),
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s_scroll_w,
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BAN::Math::max<uint32_t>(texture.height() / programs.size(), s_scroll_h_min),
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s_color_scroll
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);
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}
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void render_initial_window(LibGUI::Window& window, const LibFont::Font& font)
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{
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auto& texture = window.texture();
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texture.fill(s_color_bg1);
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texture.fill_rect(s_margin, s_margin + line_h(font) + s_padding, line_w(font), s_separator_h, s_color_separator);
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}
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struct Rectangle { uint32_t x, y, w, h; };
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int main()
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{
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auto attributes = LibGUI::Window::default_attributes;
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attributes.alpha_channel = true;
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attributes.title_bar = false;
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auto font = MUST(LibFont::Font::load("/usr/share/fonts/lat0-16.psfu"_sv));
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const auto full_program_list = get_program_list();
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// FIXME: implement widgets
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const Rectangle search_area {
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.x = s_margin,
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.y = s_margin,
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.w = line_w(font),
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.h = line_h(font),
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};
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const Rectangle list_area {
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.x = s_margin,
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.y = search_area.x + search_area.h + s_padding + s_separator_h + s_padding,
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.w = line_w(font),
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.h = line_h(font) * s_list_height,
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};
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const Rectangle scroll_area {
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.x = list_area.x + list_area.w - (s_padding + s_scroll_w + s_padding),
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.y = list_area.y,
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.w = s_padding + s_scroll_w + s_padding,
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.h = list_area.h,
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};
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auto search_texture = MUST(LibGUI::Texture::create(
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search_area.w,
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search_area.h,
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s_color_bg1
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));
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auto list_texture = MUST(LibGUI::Texture::create(
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list_area.w,
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list_area.h,
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s_color_bg1
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));
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auto scroll_texture = MUST(LibGUI::Texture::create(
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scroll_area.w,
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scroll_area.h,
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s_color_bg1
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));
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auto window = MUST(LibGUI::Window::create(
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scroll_area.x + scroll_area.w + s_margin,
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scroll_area.y + scroll_area.h + s_margin,
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""_sv,
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attributes
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));
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BAN::String prompt;
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size_t selected = 0;
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auto filtered_list = get_filtered_program_list(full_program_list.span(), prompt);
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const auto refresh_selected =
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[&]()
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{
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render_list(list_texture, font, filtered_list.span(), selected);
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window->texture().copy_texture(list_texture, list_area.x, list_area.y);
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window->invalidate(list_area.x, list_area.y, list_area.w, list_area.h);
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if (filtered_list.size() > s_list_height)
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{
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render_scroll(scroll_texture, filtered_list.span(), selected);
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window->texture().copy_texture(scroll_texture, scroll_area.x, scroll_area.y);
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window->invalidate(scroll_area.x, scroll_area.y, scroll_area.w, scroll_area.h);
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}
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};
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const auto refresh_search =
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[&]()
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{
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selected = 0;
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filtered_list = get_filtered_program_list(full_program_list.span(), prompt);
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render_search_box(search_texture, font, prompt);
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window->texture().copy_texture(search_texture, search_area.x, search_area.y);
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window->invalidate(search_area.x, search_area.y, search_area.w, search_area.h);
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render_list(list_texture, font, filtered_list.span(), selected);
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window->texture().copy_texture(list_texture, list_area.x, list_area.y);
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window->invalidate(list_area.x, list_area.y, list_area.w, list_area.h);
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if (filtered_list.size() > s_list_height)
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{
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render_scroll(scroll_texture, filtered_list.span(), selected);
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window->texture().copy_texture(scroll_texture, scroll_area.x, scroll_area.y);
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window->invalidate(scroll_area.x, scroll_area.y, scroll_area.w, scroll_area.h);
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}
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};
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window->set_key_event_callback(
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[&](LibGUI::EventPacket::KeyEvent::event_t event)
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{
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if (!event.pressed())
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return;
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switch (event.key)
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{
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case LibInput::Key::ArrowUp:
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selected = (selected + filtered_list.size() - 1) % filtered_list.size();
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refresh_selected();
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break;
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case LibInput::Key::ArrowDown:
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selected = (selected + 1) % filtered_list.size();
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refresh_selected();
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break;
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case LibInput::Key::Escape:
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exit(0);
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case LibInput::Key::Enter:
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{
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const char* program = filtered_list.empty() ? prompt.data() : filtered_list[selected].data();
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int null = open("/dev/null", O_RDWR | O_CLOEXEC);
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if (null == -1)
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dwarnln("open: {}", strerror(errno));
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else
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{
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dup2(null, STDIN_FILENO);
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dup2(null, STDOUT_FILENO);
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dup2(null, STDERR_FILENO);
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}
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execlp(program, program, nullptr);
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dwarnln("execlp: {}", strerror(errno));
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exit(1);
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}
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case LibInput::Key::Backspace:
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if (prompt.empty())
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break;
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while (!prompt.empty() && (prompt.back() & 0xC0) == 0x80)
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prompt.pop_back();
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if (!prompt.empty())
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prompt.pop_back();
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refresh_search();
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break;
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default:
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const char* utf8 = LibInput::key_to_utf8(event.key, event.modifier);
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if (utf8 == nullptr)
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break;
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MUST(prompt.append(utf8));
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refresh_search();
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break;
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}
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}
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);
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render_initial_window(*window, font);
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refresh_search();
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window->invalidate();
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for (;;)
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{
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window->wait_events();
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window->poll_events();
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}
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}
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