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Add readLine() to Eidos - resolves issue #576 #577

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Add readLine() to Eidos - resolves issue #576 #577

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fcf3d55
Add readLine() function: from terminal, pauses execution and reads us…
chris-a-talbot Nov 19, 2025
eb09ff1
Fix GUI detection and add issue comments
chris-a-talbot Nov 19, 2025
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1 change: 1 addition & 0 deletions eidos/eidos_functions.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -369,6 +369,7 @@ const std::vector<EidosFunctionSignature_CSP> &EidosInterpreter::BuiltInFunction
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("fileExists", Eidos_ExecuteFunction_fileExists, kEidosValueMaskLogical | kEidosValueMaskSingleton))->AddString_S(gEidosStr_filePath));
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("flushFile", Eidos_ExecuteFunction_flushFile, kEidosValueMaskLogical | kEidosValueMaskSingleton))->AddString_S(gEidosStr_filePath));
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("readFile", Eidos_ExecuteFunction_readFile, kEidosValueMaskString))->AddString_S(gEidosStr_filePath));
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("readLine", Eidos_ExecuteFunction_readLine, kEidosValueMaskString | kEidosValueMaskSingleton)));
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("setwd", Eidos_ExecuteFunction_setwd, kEidosValueMaskString | kEidosValueMaskSingleton))->AddString_S("path"));
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("tempdir", Eidos_ExecuteFunction_tempdir, kEidosValueMaskString | kEidosValueMaskSingleton)));
signatures->emplace_back((EidosFunctionSignature *)(new EidosFunctionSignature("writeFile", Eidos_ExecuteFunction_writeFile, kEidosValueMaskLogical | kEidosValueMaskSingleton))->AddString_S(gEidosStr_filePath)->AddString("contents")->AddLogical_OS("append", gStaticEidosValue_LogicalF)->AddLogical_OS("compress", gStaticEidosValue_LogicalF));
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1 change: 1 addition & 0 deletions eidos/eidos_functions.h
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Expand Up @@ -250,6 +250,7 @@ EidosValue_SP Eidos_ExecuteFunction_filesAtPath(const std::vector<EidosValue_SP>
EidosValue_SP Eidos_ExecuteFunction_flushFile(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
EidosValue_SP Eidos_ExecuteFunction_getwd(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
EidosValue_SP Eidos_ExecuteFunction_readFile(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
EidosValue_SP Eidos_ExecuteFunction_readLine(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
EidosValue_SP Eidos_ExecuteFunction_setwd(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
EidosValue_SP Eidos_ExecuteFunction_tempdir(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
EidosValue_SP Eidos_ExecuteFunction_writeFile(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter);
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36 changes: 36 additions & 0 deletions eidos/eidos_functions_files.cpp
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Expand Up @@ -27,7 +27,9 @@
#include <stdio.h>
#include <dirent.h>
#include <fstream>
#include <iostream>
#include <sys/stat.h>
#include <unistd.h>

#include "../eidos_zlib/zlib.h"

Expand Down Expand Up @@ -220,6 +222,40 @@ EidosValue_SP Eidos_ExecuteFunction_readFile(const std::vector<EidosValue_SP> &p
return result_SP;
}

// (string$)readLine(void)
EidosValue_SP Eidos_ExecuteFunction_readLine(const std::vector<EidosValue_SP> &p_arguments, EidosInterpreter &p_interpreter)
{
#pragma unused (p_arguments)

#ifdef EIDOS_GUI
EIDOS_TERMINATION << "ERROR (Eidos_ExecuteFunction_readLine): function readLine() is not available in GUI environments (SLiMgui, SLiMguiLegacy, or EidosScribe)." << EidosTerminate(nullptr);
#endif

// This function was implemented by Chris Talbot 11/19/25 for use in reinforcement learning environments.
// Associated with issue #576.

EidosValue_SP result_SP(nullptr);

// Read a single line from stdin (command-line mode with interactive terminal)
std::string line;

if (std::getline(std::cin, line))
{
// Control for CRLF vs. LF line endings
if (!line.empty() && line[line.size() - 1] == '\r')
line.pop_back();

result_SP = EidosValue_SP(new (gEidosValuePool->AllocateChunk()) EidosValue_String(line));
}
else
{
// EOF or error reading from stdin; return empty string
result_SP = EidosValue_SP(new (gEidosValuePool->AllocateChunk()) EidosValue_String(""));
}

return result_SP;
}

// (string$)setwd(string$ path)
EidosValue_SP Eidos_ExecuteFunction_setwd(const std::vector<EidosValue_SP> &p_arguments, __attribute__((unused)) EidosInterpreter &p_interpreter)
{
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