merge nvdc into nvc (#764)

use a unified nvc to start the neovim client, and then have a flag --gui
to start the neovim gui program.
And collect some common GUI startup methods, detect which one exists and
start which one.

---------

Co-authored-by: nash <nash@iffy.me>

modules/nvim/nvim.nu

@@ -51,17 +51,18 @@ export-env {
     })
 }
 
-def edit [action file] {
+def edit [action ...file] {
     if ($env.NVIM? | is-empty) {
-        nvim $file
+        nvim ...$file
     } else {
-        let af = ($file | each {|f|
+        let af = $file
+        | each {|f|
             if ($f|str substring ..1) in ['/', '~'] {
                 $f
             } else {
                 $"($env.PWD)/($f)"
             }
-        })
+        }
         let cmd = $"<cmd>($action) ($af|str join ' ')<cr>"
         nvim --headless --noplugin --server $env.NVIM --remote-send $cmd
     }
@@ -81,7 +82,7 @@ export def e [...file: string] {
     if ($file|is-empty) {
         nvim
     } else {
-        edit vsplit $file
+        edit vsplit ...$file
     }
 }
 
@@ -89,7 +90,7 @@ export def c [...file: string] {
     if ($file|is-empty) {
         nvim
     } else {
-        edit split $file
+        edit split ...$file
     }
 }
 
@@ -97,7 +98,7 @@ export def v [...file: string] {
     if ($file|is-empty) {
         nvim
     } else {
-        edit vsplit $file
+        edit vsplit ...$file
     }
 }
 
@@ -105,7 +106,7 @@ export def x [...file: string] {
     if ($file|is-empty) {
         nvim
     } else {
-        edit tabnew $file
+        edit tabnew ...$file
     }
 }
 
@@ -134,14 +135,25 @@ export def opwd [] {
     nvim-lua 'OppositePwd()'
 }
 
-export def nvim-srv [port: int=9999] {
+export def nvs [port: int=9999] {
     nvim --headless --listen $"0.0.0.0:($port)"
 }
 
-export def nvc [addr: string] {
-    nvim --remote-ui --server $addr
-}
-
-export def nvdc [addr: string] {
-    neovide --maximized --server $addr
+export def nvc [
+    addr: string
+    --gui(-g)
+] {
+    if $gui {
+        let gs = {
+            neovide: [--maximized --server $addr]
+        }
+        for g in ($gs | transpose prog args) {
+            if not (which $g.prog | is-empty) {
+                ^$g.prog ...$g.args
+                break
+            }
+        }
+    } else {
+        nvim --remote-ui --server $addr
+    }
 }