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/**
* Copyright (c) 2022, Timothy Stack
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Timothy Stack nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @file readline_context.hh
*/
#ifndef readline_context_hh
#define readline_context_hh
#include <set>
#include <string>
#include <readline/history.h>
#include "base/lnav.console.hh"
#include "base/result.h"
#include "help_text.hh"
class attr_line_t;
struct exec_context;
using readline_highlighter_t = void (*)(attr_line_t& line, int x);
/**
* Container for information related to different readline contexts. Since
* lnav uses readline for different inputs, we need a way to keep things like
* history and tab-completions separate.
*/
class readline_context {
public:
using command_func_t = Result<std::string, lnav::console::user_message> (*)(
exec_context& ec, std::string cmdline, std::vector<std::string>& args);
struct prompt_result_t {
std::string pr_new_prompt;
std::string pr_suggestion;
};
struct stage {
std::vector<line_range> s_args;
};
struct split_result_t {
std::vector<stage> sr_stages;
};
using prompt_func_t
= prompt_result_t (*)(exec_context& ec, const std::string& cmdline);
using splitter_func_t
= split_result_t (*)(readline_context& rc, const std::string& cmdline);
using command_t = struct _command_t {
const char* c_name;
command_func_t c_func;
struct help_text c_help;
prompt_func_t c_prompt{nullptr};
std::string c_provides;
std::set<std::string> c_dependencies;
_command_t(const char* name,
command_func_t func,
help_text help = {},
prompt_func_t prompt = nullptr,
std::string provides = {},
std::set<std::string> deps = {}) noexcept
: c_name(name), c_func(func), c_help(std::move(help)),
c_prompt(prompt), c_provides(provides), c_dependencies(deps)
{
}
_command_t(command_func_t func) noexcept : c_name("anon"), c_func(func)
{
}
};
typedef std::map<std::string, command_t*> command_map_t;
readline_context(std::string name,
command_map_t* commands = nullptr,
bool case_sensitive = true);
const std::string& get_name() const { return this->rc_name; }
void load();
void set_history();
void save();
void add_possibility(const std::string& type, const std::string& value)
{
this->rc_possibilities[type].insert(value);
}
void rem_possibility(const std::string& type, const std::string& value)
{
this->rc_possibilities[type].erase(value);
}
void clear_possibilities(const std::string& type)
{
this->rc_possibilities[type].clear();
}
bool is_case_sensitive() const { return this->rc_case_sensitive; }
readline_context& set_append_character(int ch)
{
this->rc_append_character = ch;
return *this;
}
int get_append_character() const { return this->rc_append_character; }
readline_context& set_highlighter(readline_highlighter_t hl)
{
this->rc_highlighter = hl;
return *this;
}
readline_context& set_quote_chars(const char* qc)
{
this->rc_quote_chars = qc;
return *this;
}
readline_context& with_readline_var(char** var, const char* val)
{
this->rc_vars.emplace_back(var, val);
return *this;
}
readline_highlighter_t get_highlighter() const
{
return this->rc_highlighter;
}
readline_context& with_splitter(splitter_func_t sf)
{
this->rc_splitter = sf;
return *this;
}
static int command_complete(int, int);
std::map<std::string, std::string> rc_prefixes;
private:
static char** attempted_completion(const char* text, int start, int end);
static char* completion_generator(const char* text, int state);
static readline_context* loaded_context;
static std::set<std::string>* arg_possibilities;
struct readline_var {
readline_var(char** dst, const char* val)
{
this->rv_dst.ch = dst;
this->rv_val.ch = val;
}
union {
char** ch;
} rv_dst;
union {
const char* ch;
} rv_val;
};
std::string rc_name;
HISTORY_STATE rc_history;
std::map<std::string, std::set<std::string>> rc_possibilities;
std::map<std::string, std::vector<std::string>> rc_prototypes;
std::map<std::string, command_t*> rc_commands;
bool rc_case_sensitive;
int rc_append_character{' '};
const char* rc_quote_chars;
readline_highlighter_t rc_highlighter;
std::vector<readline_var> rc_vars;
splitter_func_t rc_splitter{nullptr};
};
#endif
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