Fix std/random bug (#204) (#211)

* Fix std/random bug

- Remove OpenSystemsLab/tempfile.nim and replace with build-in `std/tempfiles`
- Remove low level stuff that might break in newer Windows update and replace with build-in `fusion/ioutils`
- Add ability to name the temp file

* Reorder template and change from `when` to `if`

* Update nimib.nimble

* Remove filename overload

Author: sent44

nimib.nimble

@@ -9,7 +9,7 @@ srcDir        = "src"
 # Dependencies
 
 requires "nim >= 1.4.0"
-requires "tempfile >= 0.1.6"
+requires "fusion >= 1.2"
 requires "markdown >= 0.8.1"
 requires "mustache >= 0.2.1"
 requires "parsetoml >= 0.7.0"

src/nimib/capture.nim

@@ -1,30 +1,29 @@
 ## This submodule implements only one template to temporarily redirect and capture stdout during execution of a chunk of code.
-import tempfile
-
-# see https://stackoverflow.com/questions/64026829/how-to-temporarily-capture-stdout
-# Thanks, Clonk!
-
-# low level, should be Posix only but they happen to work on (my) Windows, too!
-proc dup(oldfd: FileHandle): FileHandle {.importc, header: "unistd.h".}
-proc dup2(oldfd: FileHandle, newfd: FileHandle): cint {.importc, header: "unistd.h".}
+import fusion/ioutils
+import std/tempfiles
 
 template captureStdout*(ident: untyped, body: untyped) =
-  ## redirect stdout to a temporary file and captures output of body in ident
-  let
+    ## redirect stdout to a temporary file and captures output of body in ident
     # Duplicate stdout
-    stdoutFileno = stdout.getFileHandle()
-    stdoutDupfd = dup(stdoutFileno)
-    # Create a new temporary file
-    (tmpFile, tmpFilename) = mkstemp(mode=fmWrite)
-    tmpFileFd: FileHandle = tmpFile.getFileHandle()  
-  discard dup2(tmpFileFd, stdoutFileno)  # writing to stdoutFileno now writes to tmpFile
-
-  body
-  flushFile stdout
-
-  # before reading tmpFile, flush and close
-  tmpFile.flushFile()  
-  tmpFile.close()
-  ident = readFile(tmpFileName)
-  # Restore stdout
-  discard dup2(stdoutDupfd, stdoutFileno)
+    let stdoutFileno: FileHandle = stdout.getFileHandle()
+    let stdoutDupFd: FileHandle = stdoutFileno.duplicate()
+    
+    # Create a new temporary file or attempt to open it
+    let (tmpFile, _) = createTempFile("tmp", "")
+    let tmpFileFd: FileHandle = tmpFile.getFileHandle() 
+    
+    # writing to stdoutFileno now writes to tmpFile
+    tmpFileFd.duplicateTo(stdoutFileno)
+    
+    # Execute body code
+    body
+    
+    # Flush stdout and tmpFile, read tmpFile from start to ident and then close tmpFile
+    stdout.flushFile()
+    tmpFile.flushFile()
+    tmpFile.setFilePos(0)
+    ident = tmpFile.readAll()
+    tmpFile.close()
+    
+    # Restore stdout
+    stdoutDupFd.duplicateTo(stdoutFileno)