MBS as default shell

1 files changed, 66 insertions, 0 deletions

diff --git a/.mbs/modules/readline.lua b/.mbs/modules/readline.lua
new file mode 100644
index 0000000..4dea9eb
--- /dev/null
+++ b/.mbs/modules/readline.lua
@@ -0,0 +1,66 @@
+--- Additional readline
+
+local function lib_load(path, name)
+  if not _G[name] then
+    os.loadAPI(fs.combine(path, "lib/" .. name .. ".lua"))
+    if not _G[name] then _G[name] = _G[name .. ".lua"] end
+  end
+end
+
+return {
+  description =
+    "This module extends the default read function, adding keybindings similar to " ..
+    "those provided by Emacs or GNU readline as well as additional configuration options.",
+
+  dependencies = {
+    "lib/readline.lua",
+  },
+
+  settings = {
+    {
+      name = "mbs.readline.enabled",
+      description = "Whether the readline module is enabled.",
+      default = true,
+    },
+    {
+      name = "mbs.readline.complete_bg",
+      description = "The background colour for completions.",
+      default = "none",
+    },
+    {
+      name = "mbs.readline.complete_fg",
+      description = "The foreground colour for completions.",
+      default = "grey",
+    }
+  },
+
+  enabled = function() return settings.get("mbs.readline.enabled") end,
+
+  setup = function(path)
+    lib_load(path, "readline")
+
+    -- Replace the default read function
+    _G.read = function(replace_char, history, complete, default)
+      if replace_char ~= nil and type(replace_char) ~= "string" then
+        error("bad argument #1 (expected string, got " .. type(replace_char) .. ")", 2)
+      end
+      if history ~= nil and type(history) ~= "table" then
+        error("bad argument #2 (expected table, got " .. type(history) .. ")", 2)
+      end
+      if complete ~= nil and type(complete) ~= "function" then
+        error("bad argument #3 (expected function, got " .. type(complete) .. ")", 2)
+      end
+      if default ~= nil and type(default) ~= "string" then
+        error("bad argument #4 (expected string, got " .. type(default) .. ")", 2)
+      end
+
+      return readline.read {
+        replace_char = replace_char,
+        history = history,
+        complete = complete,
+        default = default,
+      }
+    end
+
+  end,
+}
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