web: the config cast edits in colour

vim -u NONE kept the render machine's dotfiles out of the cast, but
NONE also switches off filetype detection and syntax -- so the config
demo was editing kdl in monochrome, underselling vim and the file both.
The demo now authors its own six-line vimrc instead: syntax on,
habamax (the webdemo's own look), shortmess for the column. The cast
depends on vim's runtime and nothing personal, which is what NONE was
protecting in the first place.

1 files changed, 19 insertions, 7 deletions

diff --git a/web/recordings/demos/config.py b/web/recordings/demos/config.py
index 2f9081f..7200d63 100644
--- a/web/recordings/demos/config.py
+++ b/web/recordings/demos/config.py
@@ -15,18 +15,30 @@ import tempfile
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
 from castgen import THEME, Recorder, out_path
 
-# shortmess: the rotated editor pane is a column, and vim's file-info
-# message wraps there into a hit-enter prompt mid-demo. F drops it.
+work = tempfile.mkdtemp(prefix="slosh-demo-")
+cfg = os.path.join(work, "config.kdl")
+shutil.copyfile(THEME, cfg)
+
+# The editor's vimrc, authored here rather than -u NONE: NONE keeps the
+# render machine's dotfiles out of the cast, but it also turns off filetype
+# detection and syntax -- and a config demo whose config is monochrome
+# undersells both vim and the file. This is the whole rc, so the cast
+# depends on vim's own runtime and nothing personal. shortmess because the
+# rotated editor pane is a column, and the file-info message would wrap
+# there into a hit-enter prompt mid-demo.
+vimrc = os.path.join(work, "vimrc")
+with open(vimrc, "w") as f:
+    f.write(
+        "set nocompatible\nfiletype on\nsyntax on\ncolorscheme habamax\n"
+        "set noswapfile\nset shortmess+=atoOF\n"
+    )
+
 ENV = {
     "PS1": "$ ",
     "ENV": "/dev/null",
-    "EDITOR": 'vim -u NONE -i NONE -c "set shortmess+=atoOF"',
+    "EDITOR": "vim -u %s -i NONE" % vimrc,
 }
 
-work = tempfile.mkdtemp(prefix="slosh-demo-")
-cfg = os.path.join(work, "config.kdl")
-shutil.copyfile(THEME, cfg)
-
 r = Recorder(["/bin/sh"], cols=100, rows=28, title="make it yours", config=cfg, env=ENV)
 
 # Something on the one pane, so geometry changes have a witness. No neighbour