Check output device is a terminal: Difference between revisions
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End Module</lang> |
End Module</lang> |
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=={{header|Wren}}== |
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{{trans|C}} |
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As there is currently no way to obtain this information via Wren CLI, we instead embed a Wren script in a C application and ask the host program to get it for us. |
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<lang ecmascript>/* check_output_device_is_terminal.wren */ |
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class C { |
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foreign static isOutputDeviceTerminal |
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} |
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System.print("Output device is a terminal = %(C.isOutputDeviceTerminal)")</lang> |
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<br> |
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We now embed this Wren script in the following C program, compile and run it. |
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<lang c>#include <stdlib.h> |
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#include <unistd.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include "wren.h" |
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void C_isOutputDeviceTerminal(WrenVM* vm) { |
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bool isTerminal = (bool)isatty(fileno(stdout)); |
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wrenSetSlotBool(vm, 0, isTerminal); |
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} |
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WrenForeignMethodFn bindForeignMethod( |
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WrenVM* vm, |
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const char* module, |
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const char* className, |
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bool isStatic, |
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const char* signature) { |
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if (strcmp(module, "main") == 0) { |
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if (strcmp(className, "C") == 0) { |
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if (isStatic && strcmp(signature, "isOutputDeviceTerminal") == 0) { |
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return C_isOutputDeviceTerminal; |
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} |
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} |
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} |
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return NULL; |
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} |
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static void writeFn(WrenVM* vm, const char* text) { |
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printf("%s", text); |
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} |
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void errorFn(WrenVM* vm, WrenErrorType errorType, const char* module, const int line, const char* msg) { |
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switch (errorType) { |
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case WREN_ERROR_COMPILE: |
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printf("[%s line %d] [Error] %s\n", module, line, msg); |
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break; |
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case WREN_ERROR_STACK_TRACE: |
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printf("[%s line %d] in %s\n", module, line, msg); |
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break; |
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case WREN_ERROR_RUNTIME: |
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printf("[Runtime Error] %s\n", msg); |
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break; |
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} |
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} |
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char *readFile(const char *fileName) { |
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FILE *f = fopen(fileName, "r"); |
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fseek(f, 0, SEEK_END); |
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long fsize = ftell(f); |
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rewind(f); |
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char *script = malloc(fsize + 1); |
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fread(script, 1, fsize, f); |
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fclose(f); |
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script[fsize] = 0; |
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return script; |
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} |
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int main() { |
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WrenConfiguration config; |
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wrenInitConfiguration(&config); |
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config.writeFn = &writeFn; |
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config.errorFn = &errorFn; |
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config.bindForeignMethodFn = &bindForeignMethod; |
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WrenVM* vm = wrenNewVM(&config); |
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const char* module = "main"; |
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const char* fileName = "check_output_device_is_terminal.wren"; |
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char *script = readFile(fileName); |
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WrenInterpretResult result = wrenInterpret(vm, module, script); |
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switch (result) { |
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case WREN_RESULT_COMPILE_ERROR: |
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printf("Compile Error!\n"); |
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break; |
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case WREN_RESULT_RUNTIME_ERROR: |
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printf("Runtime Error!\n"); |
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break; |
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case WREN_RESULT_SUCCESS: |
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break; |
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} |
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wrenFreeVM(vm); |
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free(script); |
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return 0; |
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}</lang> |
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{{out}} |
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<pre> |
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$ ./check_output_device_is_terminal |
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Output device is a terminal = true |
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$ ./check_output_device_is_terminal > tmp |
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$ cat tmp |
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Output device is a terminal = false |
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$ ./check_output_device_is_terminal | cat |
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Output device is a terminal = false |
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</pre> |
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=={{header|zkl}}== |
=={{header|zkl}}== |