enhance(main/neovim{,-nightly}): document has('termux') feature flag

Author: TomJo2000

packages/neovim-nightly/build.sh

@@ -4,6 +4,7 @@ TERMUX_PKG_LICENSE="Apache-2.0, VIM License"
 TERMUX_PKG_LICENSE_FILE="LICENSE.txt"
 TERMUX_PKG_MAINTAINER="Joshua Kahn <tom@termux.dev>"
 TERMUX_PKG_VERSION="0.12.0~dev-2435+g18c5f06c9f"
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL="https://github.com/neovim/neovim/archive/${TERMUX_PKG_VERSION##*+g}.tar.gz"
 TERMUX_PKG_SHA256=3518260bbe8e755204b8d6fc25d1238be940b7138792fa3934022450c8a959cd
 TERMUX_PKG_REPOLOGY_METADATA_VERSION="${TERMUX_PKG_VERSION%%~*}"

packages/neovim-nightly/has-termux.patch

@@ -0,0 +1 @@
+../neovim/has-termux.patch

packages/neovim-nightly/src-nvim-eval-funcs.c.patch

@@ -4,7 +4,7 @@ TERMUX_PKG_LICENSE="Apache-2.0, VIM License"
 TERMUX_PKG_LICENSE_FILE="LICENSE.txt"
 TERMUX_PKG_MAINTAINER="Joshua Kahn <tom@termux.dev>"
 TERMUX_PKG_VERSION="0.11.6"
-TERMUX_PKG_REVISION=2
+TERMUX_PKG_REVISION=3
 TERMUX_PKG_SRCURL="https://github.com/neovim/neovim/archive/refs/tags/v${TERMUX_PKG_VERSION}.tar.gz"
 TERMUX_PKG_SHA256=d1c8e3f484ed1e231fd5f48f53b7345b628e52263d5eef489bb8b73ca8d90fca
 TERMUX_PKG_DEPENDS="libandroid-support, libiconv, libmsgpack, libunibilium, libuv, libvterm (>= 1:0.3-0), lua51-lpeg, luajit, luv, tree-sitter, tree-sitter-parsers, utf8proc"

packages/neovim/build.sh

@@ -0,0 +1,52 @@
+The first two hunks of patch are applied directly to the pregenerated documentation files.
+This means it must be (re)created from the release tarballs if it needs to be regenerated!
+
+Modifying `src/nvim/eval.lua` and then recreating the documentation files with `make doc`
+would in principle be possible as part of the `termux_step_host_build()` function.
+However as of time of writing, March 6. 2026 (Neovim version 0.11.6) I have not been able
+to successfully produce modified docs for Neovim at build time.
+
+Please make sure to retain this header comment if you regenerating this patch.
+diff --git a/runtime/doc/vimfn.txt b/runtime/doc/vimfn.txt
+index 8f52e14..7c35094 100644
+--- a/runtime/doc/vimfn.txt
++++ b/runtime/doc/vimfn.txt
+@@ -4624,6 +4624,10 @@ has({feature})                                                           *has()*
+ 			win32		Windows system (32 or 64 bit).
+ 			win64		Windows system (64 bit).
+ 			wsl		WSL (Windows Subsystem for Linux) system.
++			android		Alias for has('termux')
++			termux		Termux environment (The *termux* and *android*
++					feature flags are {included additionally}
++					in Termux's Neovim package.)
+ 
+ 							*has-patch*
+ 		3.  Vim patch. For example the "patch123" feature means that
+diff --git a/runtime/lua/vim/_meta/vimfn.lua b/runtime/lua/vim/_meta/vimfn.lua
+index 1a13885..491a48b 100644
+--- a/runtime/lua/vim/_meta/vimfn.lua
++++ b/runtime/lua/vim/_meta/vimfn.lua
+@@ -4175,6 +4175,10 @@ function vim.fn.globpath(path, expr, nosuf, list, allinks) end
+ ---   win32    Windows system (32 or 64 bit).
+ ---   win64    Windows system (64 bit).
+ ---   wsl    WSL (Windows Subsystem for Linux) system.
++---   android    Alias for has('termux')
++---   termux    Termux environment (The *termux* and *android*
++---             feature flags are {included additionally}
++---             in Termux's Neovim package.)
+ ---
+ ---           *has-patch*
+ --- 3.  Vim patch. For example the "patch123" feature means that
+diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
+index 752b367..349b7c3 100644
+--- a/src/nvim/eval/funcs.c
++++ b/src/nvim/eval/funcs.c
+@@ -3087,6 +3087,8 @@ static void f_has(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
+ #ifdef _WIN64
+     "win64",
+ #endif
++    "android",
++    "termux",
+ #ifndef CASE_INSENSITIVE_FILENAME
+     "fname_case",
+ #endif