From 35a949ea66bb0137e187841a82920a10836e8f00 Mon Sep 17 00:00:00 2001
From: Chris Mumford <cmumford@cmumford.com>
Date: Tue, 2 Nov 2021 19:12:15 -0700
Subject: [PATCH 1/3] Initialize `$envvars_array` to an empty list.

With strict debugging, i.e. `Set-PSDebug -strict`, execution of export.ps1 will
report the following error:

```
The variable '$envars_array' cannot be retrieved because it has not been set.
At C:\path\to\export.ps1:15 char:1
+ $envars_array # will be filled like:
+ ~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (envars_array:String) [], RuntimeException
    + FullyQualifiedErrorId : VariableIsUndefined
```

Closes https://github.com/espressif/esp-idf/pull/7819
---
 export.ps1 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/export.ps1 b/export.ps1
index 2daa7575aa..4ecf066eb5 100644
--- a/export.ps1
+++ b/export.ps1
@@ -12,7 +12,7 @@ $OLD_PATH = $env:PATH.split($S) | Select-Object -Unique # array without duplicat
 $envars_raw = python $IDF_PATH/tools/idf_tools.py export --format key-value
 if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE } # if error
 
-$envars_array # will be filled like:
+$envars_array = @() # will be filled like:
 #               [
 #                    [vname1, vval1], [vname2, vval2], ...
 #               ]

From ddf79c2be952e08d6bbfdcc47246da05f8ef677f Mon Sep 17 00:00:00 2001
From: Chris Mumford <cmumford@cmumford.com>
Date: Mon, 8 Nov 2021 18:47:35 -0800
Subject: [PATCH 2/3] Define $IsWindows if not defined.

The `$IsWindows` PowerShell variable was added in PowerShell Core 6 and
PowerShell 7, and is not present in earlier PowerShell versions. Set to
true if undefined. This fixes https://github.com/espressif/esp-idf/issues/7820.

The first version to run on non-Windows platforms was PowerShell Core
6.0[^1] which means that IsWindows is guaranteed to be defined on all
non-Windows systems. So, if undefined this indicates a Windows platform.

[^1]: https://docs.microsoft.com/en-us/powershell/scripting/install/powershell-support-lifecycle?view=powershell-7.2#release-history

Closes https://github.com/espressif/esp-idf/pull/7858

Closes https://github.com/espressif/esp-idf/issues/7820
---
 export.ps1 | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/export.ps1 b/export.ps1
index 4ecf066eb5..7efc639ca5 100644
--- a/export.ps1
+++ b/export.ps1
@@ -23,6 +23,11 @@ foreach ($line  in $envars_raw) {
     $envars_array += (, ($var_name, $var_val))
 }
 
+if ($IsWindows -eq $null) {
+    # $IsWindows was added in PowerShell Core 6 and PowerShell 7.
+    $IsWindows = $true
+}
+
 foreach ($pair  in $envars_array) {
     # setting the values
     $var_name = $pair[0].Trim() # trim spaces on the ends of the name

From 896f6f2dfc74755a2b81c9d8f096650b3215cd7e Mon Sep 17 00:00:00 2001
From: Roland Dobai <roland@espressif.com>
Date: Tue, 9 Nov 2021 11:28:48 +0100
Subject: [PATCH 3/3] Tools: Make clear the used platform in the PowerShell
 export script

---
 export.ps1 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/export.ps1 b/export.ps1
index 7efc639ca5..ce92c15108 100644
--- a/export.ps1
+++ b/export.ps1
@@ -24,7 +24,8 @@ foreach ($line  in $envars_raw) {
 }
 
 if ($IsWindows -eq $null) {
-    # $IsWindows was added in PowerShell Core 6 and PowerShell 7.
+    # $IsWindows was added in PowerShell Core 6 and PowerShell 7 together with multi-platform support. # I.E. if this
+    # internal variable is not set then PowerShell 5 is used and # the platform cannot be # anything else than Windows.
     $IsWindows = $true
 }