334 lines
8.2 KiB
C++
334 lines
8.2 KiB
C++
#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <csignal>
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#include <csetjmp>
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#include <functional>
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#include <readline/readline.h>
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#include <readline/history.h>
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#include <fmt/core.h>
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#include <fmt/color.h>
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#include "session.h"
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#include "shell.h"
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#include "theme.h"
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#include "parser.h"
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#include "commands.h"
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#include <fxos/util/log.h>
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#include <fxos/semantics.h>
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static std::map<std::string, ShellCommand *> commands;
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ShellCommand::ShellCommand(std::string _name, ShellFunction _function,
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ShellCompleter _completer, std::string _shortd, std::string _longd):
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function {_function}, completer {_completer},
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short_description {_shortd}
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{
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/* Left trim */
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_longd.erase(0, _longd.find_first_not_of("\n"));
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/* Right trim */
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int r = _longd.size();
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while(r > 0 && _longd[--r] == '\n') {}
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_longd.erase(r+1, _longd.size());
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this->long_description = _longd;
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commands[_name] = this;
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}
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static Session global_session;
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//---
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// Autocompletion
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//---
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std::vector<std::string> complete_command(char const *text)
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{
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std::vector<std::string> options;
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for(auto const &it: commands) {
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if(!strncmp(it.first.c_str(), text, strlen(text)))
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options.push_back(it.first);
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}
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return options;
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}
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std::vector<std::string> complete_vspace(char const *text, Session &session)
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{
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std::vector<std::string> options;
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for(auto const &it: session.spaces) {
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if(!strncmp(it.first.c_str(), text, strlen(text)))
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options.push_back(it.first);
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}
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return options;
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}
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std::vector<std::string> complete_region(char const *text)
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{
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std::vector<std::string> options;
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for(auto const &it: MemoryRegion::all()) {
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if(!strncmp(it->name.c_str(), text, strlen(text)))
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options.push_back(it->name);
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}
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return options;
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}
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std::vector<std::string> complete_symbol(char const *text, VirtualSpace *space)
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{
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std::vector<std::string> options;
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for(auto const &it: space->symbols.symbols) {
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if(!strncmp(it.name.c_str(), text, strlen(text)))
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options.push_back(it.name);
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}
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return options;
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}
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Parser::CompletionRequest parse_until_autocomplete(Session &session,
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char const *line_buffer, int point)
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{
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/* Parse partial input and try to get a category of suggestions */
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std::string input(line_buffer, point);
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lex_repl(input);
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Parser p(true);
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p.start();
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/* Read commands until the parser runs out of input and throws a
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CompletionRequest */
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try {
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do {
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p.skip_separators();
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std::string cmd = p.symbol("command");
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if(commands.count(cmd) && commands[cmd]->completer)
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commands[cmd]->completer(session, p);
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} while(!lex_idle());
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}
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catch(Parser::CompletionRequest r) {
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return r;
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}
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catch(Parser::SyntaxError &e) {
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/* Ignore syntax errors, just don't autocomplete */
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}
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return Parser::CompletionRequest("", "");
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}
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char *autocomplete(char const *text, int state)
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{
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static std::vector<std::string> options;
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static size_t i = 0;
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if(state == 0) {
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Parser::CompletionRequest const &r = parse_until_autocomplete(
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global_session, rl_line_buffer, rl_point);
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if(r.category == "command")
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options = complete_command(text);
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else if(r.category == "vspace_name")
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options = complete_vspace(text, global_session);
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else if(r.category == "memory_region")
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options = complete_region(text);
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else if(r.category == "symbol" && r.space != nullptr)
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options = complete_symbol(text, r.space);
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else
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options.clear();
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i = 0;
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}
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return (i < options.size()) ? strdup(options[i++].c_str()) : NULL;
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}
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//---
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// Shell routine
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//---
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static std::vector<std::string> parse_dot(Session &, Parser &parser)
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{
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std::vector<std::string> files;
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while(!parser.at_end())
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files.push_back(parser.str());
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return files;
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}
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void _dot(Session &s, std::vector<std::string> const &files, bool absolute)
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{
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std::vector<std::string> paths;
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for(auto const &file: files) {
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paths.push_back(absolute ? file : s.file(file).string());
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}
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lex_include(paths);
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}
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static std::string read_interactive(Session const &s, bool &leave)
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{
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std::string prompt = "no_vspace> ";
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if(s.current_space) {
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std::string name = "(none)";
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for(auto &it: s.spaces) {
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if(&it.second == s.current_space)
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name = it.first;
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}
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prompt = fmt::format("{} @ 0x{:08x}> ", name, s.current_space->cursor);
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}
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/* We need to insert RL_PROMPT_{START,END}_IGNORE into the color
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formatting, so we trick a little bit by using a space */
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std::string color = fmt::format(theme(9), " ");
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int space_pos = color.find(' ');
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std::string SC = color.substr(0, space_pos);
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std::string EC = color.substr(space_pos+1);
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std::string SI(1, RL_PROMPT_START_IGNORE);
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std::string EI(1, RL_PROMPT_END_IGNORE);
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prompt = SI+SC+EI + prompt + SI+EC+EI;
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/* Get a command to execute */
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char *cmd_ptr = readline(prompt.c_str());
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if(!cmd_ptr) {
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leave = true;
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return "";
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}
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std::string cmd = cmd_ptr;
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if(strlen(cmd_ptr) > 0)
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add_history(cmd_ptr);
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free(cmd_ptr);
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return cmd;
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}
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int main(int argc, char **argv)
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{
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Session &s = global_session;
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theme_builtin("tomorrow-night");
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rl_completion_entry_function = autocomplete;
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rl_basic_word_break_characters =
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" \t\n\"\\'`@$><=;|&{(" /* Readline's default */
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"+-*%)"; /* Word breaks with special characters in fxos */
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/* Load path into the session */
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char const *fxos_path_env = std::getenv("FXOS_PATH");
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if(fxos_path_env) {
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std::string fxos_path = fxos_path_env;
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size_t offset=0, end;
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while(true) {
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offset = fxos_path.find_first_not_of(":", offset);
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if(offset >= fxos_path.size()) break;
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end = fxos_path.find_first_of(":", offset);
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s.path.push_back(fxos_path.substr(offset, end-offset));
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offset = end;
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}
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}
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else {
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fmt::print("warning: no FXOS_PATH in environment, using WD\n");
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s.path.push_back(fs::current_path());
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}
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/* Clear readline input when receiving SIGINT */
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static sigjmp_buf sigint_buf;
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std::signal(SIGINT, [](int) {
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rl_free_line_state();
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rl_cleanup_after_signal();
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rl_line_buffer[rl_point = rl_end = rl_mark = 0] = 0;
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printf("\n");
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siglongjmp(sigint_buf, 1);
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});
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rl_set_signals();
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/* Load command history */
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char histfile[128] = "";
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if(std::getenv("HOME"))
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snprintf(histfile, 128, "%s/.fxos_history", std::getenv("HOME"));
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if(histfile[0]) read_history(histfile);
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/* Load fxosrc files from all library folders */
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std::vector<std::string> fxosrc_files;
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for(auto const &path: s.path) {
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if(fs::exists(path / "fxosrc"))
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fxosrc_files.push_back(path / "fxosrc");
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}
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if(fxosrc_files.size() > 0)
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_dot(s, fxosrc_files, true);
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/* Shell main loop */
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while(true) {
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/* Get a command if there isn't a file being executed */
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if(lex_idle()) {
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while(sigsetjmp(sigint_buf, 1) != 0);
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bool leave = false;
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std::string cmdline = read_interactive(s, leave);
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if(leave) break;
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lex_repl(cmdline);
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}
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Parser parser(false);
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try {
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/* Read the next command from the lexer */
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parser.start();
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parser.skip_separators();
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/* Read the command name */
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if(parser.lookahead().type == T::END)
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continue;
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if(parser.lookahead().type == '?') {
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for(auto const &it: commands) {
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fmt::print(" {:5s} {}\n", it.first,
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it.second->short_description);
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}
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continue;
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}
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std::string cmd = parser.symbol("command");
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if(cmd == "q" && parser.lookahead().type != '?')
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break;
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if(cmd == "p") {
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parser.dump_command();
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}
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else if(commands.count(cmd)) {
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if(parser.lookahead().type == '?') {
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fmt::print("{}: {}\n\n{}\n", cmd,
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commands[cmd]->short_description,
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commands[cmd]->long_description);
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continue;
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}
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if(commands[cmd]->function)
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commands[cmd]->function(s, parser);
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}
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else {
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fmt::print("\e[31;1merror:\e[0m unknown command '{}'\n", cmd);
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}
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}
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catch(std::exception &e) {
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fmt::print("\e[31;1merror:\e[0m {}\n", e.what());
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}
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/* Exhaust command input (if not all used by the command) */
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parser.exhaust_until_separator();
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}
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/* Save command history */
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if(histfile[0]) write_history(histfile);
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return 0;
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}
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/* Register a no-op quit command for auto-completion */
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static ShellCommand _q_cmd("q", NULL, NULL, "Quit", "Quits fxos.");
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/* Register the include command */
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static ShellCommand _dot_cmd(".",
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[](Session &s, Parser &p) { _dot(s, parse_dot(s, p), false); },
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[](Session &s, Parser &p) { parse_dot(s, p); },
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"Include scripts", R"(
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. "<script_1>" "<script_2>"...
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Reads file paths from its string arguments, and executes each of them as a
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sequence of commands in the order of the command line.
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)");
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