Make `edit` command work fine when running from an empty context

This way, the kind of context we get from a piped command allows
for opening a buffer and working with it directly.

2 files changed, 6 insertions, 4 deletions

diff --git a/src/commands.cc b/src/commands.cc
index 8ee19c49..cbb21cb7 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -249,11 +249,13 @@ void edit(const ParametersParser& parser, Context& context, const ShellContext&)
         buffer->flags() &= ~Buffer::Flags::NoHooks;
     }
 
+    Buffer* current_buffer = context.has_buffer() ? &context.buffer() : nullptr;
+
     const size_t param_count = parser.positional_count();
-    if (buffer != &context.buffer() or param_count > 1)
+    if (current_buffer and (buffer != current_buffer or param_count > 1))
         context.push_jump();
 
-    if (buffer != &context.buffer())
+    if (buffer != current_buffer)
         context.change_buffer(*buffer);
 
     if (param_count > 1 and not parser[1].empty())
diff --git a/src/context.cc b/src/context.cc
index ef2a999f..da23aac1 100644
--- a/src/context.cc
+++ b/src/context.cc
@@ -159,10 +159,10 @@ void JumpList::forget_buffer(Buffer& buffer)
 
 void Context::change_buffer(Buffer& buffer)
 {
-    if (&buffer == &this->buffer())
+    if (has_buffer() and &buffer == &this->buffer())
         return;
 
-    if (m_edition_level > 0)
+    if (has_buffer() and m_edition_level > 0)
        this->buffer().commit_undo_group();
 
     m_window.reset();