Add functionality to export settings

For the reproducer feature I need to be able to export and import the
current LLDB configuration. To realize this I've extended the existing
functionality to print settings. With the help of a new formatting
option, we can now write the settings and their values to a file
structured as regular commands.

Concretely the functionality works as follows:

  (lldb) settings export -f /path/to/file

This file contains a bunch of settings set commands, followed by the
setting's name and value.

  ...
  settings set use-external-editor false
  settings set use-color true
  settings set auto-one-line-summaries true
  settings set auto-indent true
  ...

You can import the settings again by either sourcing the file or using
the settings read command.

  (lldb) settings read -f /path/to/file

Differential revision: https://reviews.llvm.org/D52651

llvm-svn: 345346

1 files changed, 32 insertions, 0 deletions

diff --git a/lldb/lit/Settings/TestExport.test b/lldb/lit/Settings/TestExport.test
new file mode 100644
index 00000000000..fd1c5040e04
--- /dev/null
+++ b/lldb/lit/Settings/TestExport.test
@@ -0,0 +1,32 @@
+# This tests writing and reading settings from LLDB.
+
+# Check that the settings can be written to file and read again without
+# altering the values.
+# RUN: %lldb -b -o 'settings write -f %t.foo' -o 'settings read -f %t.foo' -o 'settings export %t.bar' -o 'settings read -f %t.bar' 2>&1 | FileCheck %s --check-prefix SUCCESS
+# RUN: diff -w %t.foo %t.bar
+# SUCCESS-NOT: error:
+
+# Check that exporting target settings only export target settings and nothing else.
+# RUN: %lldb -b -o 'settings write -f %t.target target' 2>&1 | FileCheck %s --check-prefix SUCCESS
+# RUN: cat %t.target | FileCheck %s --check-prefix TARGET
+# TARGET: settings set target
+# TARGET-NOT: settings set platform
+# TARGET-NOT: settings set symbols
+# TARGET-NOT: settings set interpreter
+# TARGET-NOT: settings set plugin
+
+# Check that settings appear twice when appending.
+# RUN: %lldb -b -o 'settings write -a -f %t.append target' -o 'settings write -a -f %t.append target' 2>&1 | FileCheck %s --check-prefix SUCCESS
+# RUN: cat %t.append | FileCheck %s --check-prefix APPEND
+# APPEND: settings set target.language
+# APPEND: settings set target.language
+
+# Check that an error is printed for non-existing setting.
+# RUN: echo "settings set bogus" > %t.bogus_setting
+# RUN: %lldb -b -o 'settings read -f %t.bogus_setting' 2>&1 | FileCheck %s --check-prefix BOGUS-SETTING
+# BOGUS-SETTING: error: invalid value path
+
+# Check that an error is printed for invalid value.
+# RUN: echo "settings set target.language bogus" > %t.bogus_value
+# RUN: %lldb -b -o 'settings read -f %t.bogus_value' 2>&1 | FileCheck %s --check-prefix BOGUS-VALUE
+# BOGUS-VALUE: error: invalid language type