Make shell-script-candidates completer run in the background

Read output from the script as it comes and update the candidate
list progressively.

Disable updating of the list when a completion has been explicitely
selected.

1 files changed, 23 insertions, 0 deletions

diff --git a/src/shell_manager.hh b/src/shell_manager.hh
index 7dc00f83..6b45961a 100644
--- a/src/shell_manager.hh
+++ b/src/shell_manager.hh
@@ -5,8 +5,13 @@
 #include "env_vars.hh"
 #include "string.hh"
 #include "utils.hh"
+#include "unique_descriptor.hh"
 #include "completion.hh"
 
+#include <signal.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
 namespace Kakoune
 {
 
@@ -27,6 +32,19 @@ struct EnvVarDesc
     Retriever func;
 };
 
+inline void closepid(int pid){ kill(pid, SIGTERM); int status = 0; waitpid(pid, &status, 0); }
+
+using UniqueFd = UniqueDescriptor<::close>;
+using UniquePid = UniqueDescriptor<closepid>;
+
+struct Shell
+{
+    UniquePid pid;
+    UniqueFd in;
+    UniqueFd out;
+    UniqueFd err;
+};
+
 class ShellManager : public Singleton<ShellManager>
 {
 public:
@@ -44,6 +62,11 @@ public:
                                 Flags flags = Flags::WaitForStdout,
                                 const ShellContext& shell_context = {});
 
+    Shell spawn(StringView cmdline,
+                const Context& context,
+                bool open_stdin,
+                const ShellContext& shell_complete = {});
+
     Vector<String> get_val(StringView name, const Context& context) const;
 
     CandidateList complete_env_var(StringView prefix, ByteCount cursor_pos) const;