54 lines
1.5 KiB
C++
54 lines
1.5 KiB
C++
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#ifndef READLINE_HPP
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#define READLINE_HPP
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#include <string>
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#include <string_view>
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using CodepointString = std::basic_string<char32_t>;
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class ReadlineDevice {
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public:
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using print_callback = void (*)(const CodepointString &text);
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private:
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print_callback print_cb_;
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CodepointString desired_command_;
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CodepointString current_command_;
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CodepointString desired_prompt_;
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CodepointString current_prompt_;
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char32_t readline_lastc_;
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void echo_command();
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void erase_command();
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public:
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ReadlineDevice();
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// The callback must be set before using the readline device.
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void set_print_callback(print_callback cb);
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// change the prompt.
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void set_prompt(const CodepointString &prompt);
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// Use this to print anything on the console.
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void print(const CodepointString &cps);
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// Whenever the user types a character, call 'putcode'. If the code is
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// newline, this returns the line of text that was entered, including the
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// newline. Otherwise returns empty string. Backspace is handled here.
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CodepointString putcode(char32_t codepoint);
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// This can be used to convert a codepoint string into a
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// UTF8-string.
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static std::string to_utf8(const CodepointString &cps);
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// This can be used to convert UTF8 to a codepoint string.
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// Some of the bytes may not be consumed. Returns the Codepoint
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// string and the number of bytes consumed.
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static CodepointString from_utf8(std::string_view source, int *consumed);
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};
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#endif // READLINE_HPP
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