From 145cf843dd07d579a0e4834665446eba17c96cb5 Mon Sep 17 00:00:00 2001
From: Maxime Coste <mawww@kakoune.org>
Date: Tue, 17 Oct 2017 10:02:11 +0800
Subject: [PATCH] Add a `fail` command to explicitely raise an error

---
 README.asciidoc                |  1 +
 doc/manpages/commands.asciidoc |  3 +++
 src/commands.cc                | 15 +++++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/README.asciidoc b/README.asciidoc
index a008feed..b5c82337 100644
--- a/README.asciidoc
+++ b/README.asciidoc
@@ -725,6 +725,7 @@ command `q!` has to be used).
      `:%sh{ echo echo tchou }` will echo tchou in Kakoune, whereas
      `:nop %sh{ echo echo tchou }` will not, but both will execute the
      shell command.
+ * `fail <text>`: raise an error, uses <text> as its description
 
 Multiple commands
 ~~~~~~~~~~~~~~~~~
diff --git a/doc/manpages/commands.asciidoc b/doc/manpages/commands.asciidoc
index 1140841f..0123f090 100644
--- a/doc/manpages/commands.asciidoc
+++ b/doc/manpages/commands.asciidoc
@@ -96,6 +96,9 @@ command *q!* has to be used). Aliases are mentionned below each commands.
 *nop*::
 	does nothing, but arguments will be evaluated (e.g. shell expansion)
 
+*fail* <text>::
+	raise an error, uses <text> as its description
+
 *declare-option* [-hidden] <type> <name> [<value>]::
 	*alias* decl +
 	declare a new option, the -hidden hides the option in completion
diff --git a/src/commands.cc b/src/commands.cc
index 466a84dd..1593901e 100644
--- a/src/commands.cc
+++ b/src/commands.cc
@@ -2105,6 +2105,20 @@ const CommandDesc rename_session_cmd = {
     }
 };
 
+const CommandDesc fail_cmd = {
+    "fail",
+    nullptr,
+    "fail [<message>]: raise an error with the given message",
+    ParameterDesc{},
+    CommandFlags::None,
+    CommandHelper{},
+    CommandCompleter{},
+    [](const ParametersParser& parser, Context&, const ShellContext&)
+    {
+        throw runtime_error(fix_atom_text(join(parser, ' ', false)));
+    }
+};
+
 }
 
 void register_commands()
@@ -2166,6 +2180,7 @@ void register_commands()
     register_command(select_cmd);
     register_command(change_directory_cmd);
     register_command(rename_session_cmd);
+    register_command(fail_cmd);
 }
 
 }