Editor configuration added.

README.md

@@ -7,6 +7,7 @@ procedure and through direct procedures.
 ```racket
 (require git-cli)
 
+(git 'init)
 (git 'status)
 (git 'log '-l '-5)
 (git 'fetch '--prune)
@@ -31,6 +32,7 @@ must come from a Racket expression. `gt` remains available as a compatibility
 alias for `git*`.
 
 ```racket
+(git* init)
 (git* remote -v)
 (git* switch main)
 (git* restore --staged main.rkt)
@@ -67,11 +69,11 @@ credentials, SSH keys, pull strategy, and other repository configuration.
 
 ## Commands
 
-The package currently registers commands including `status`, `add`, `commit`,
+The package currently registers commands including `init`, `status`, `add`, `commit`,
 `push`, `pull`, `fetch`, `config`, `branch`, `remote`, `stash`, `restore`, `reset`, `revert`, `rebase`, `merge`, `cherry-pick`, `mergetool`, `switch`, `clone`, `tag`, `log`,
 `rev-list`, `diff`, `show`, `grep`, `help`, `version`, and `new-version`.
 
-Most are also exported as direct procedures such as `git-status`, `git-add`,
+Most are also exported as direct procedures such as `git-init`, `git-status`, `git-add`,
 `git-fetch`, `git-config`, `git-switch`, `git-tag`, `git-log`, `git-diff`, and `git-show`.
 
 See the Scribble documentation for command-specific behavior and return values.
@@ -96,6 +98,31 @@ See the Scribble documentation for command-specific behavior and return values.
 returns all values for one key. `get key` returns one string or `#f` when the
 key is absent. `set!` returns `#t` after a successful write.
 
+
+`config editor` is a git-cli configuration command rather than a Git
+configuration key. With no additional arguments it presents an interactive
+list of discovered GUI editors:
+
+```racket
+(git* config editor)
+```
+
+The non-interactive forms are:
+
+```racket
+(git* config editor --list)
+(git* config editor vscode)
+(git* config editor auto)
+
+(git 'config 'editor "C:\\Program Files\\MyEditor\\editor.exe --wait")
+```
+
+`--list` returns `(name description command current?)` items. A known editor
+name selects the matching detected editor. `auto` clears the explicit git-cli
+editor choice and returns to automatic detection. Any other single value is
+stored as the editor command. Changing the editor immediately updates
+`GIT_EDITOR` and `GIT_SEQUENCE_EDITOR` for subsequent Git commands.
+
 ## Low-level Git execution
 
 `run-git` can be used when direct access to Git's stdin/stdout protocol is
@@ -137,15 +164,18 @@ A custom handler can still be installed through
 
 ## GUI editor and merge tool
 
-git-cli looks for a GUI editor and passes it to Git through `GIT_EDITOR` and
-`GIT_SEQUENCE_EDITOR` in the environment of the Git subprocess only. It does
-not change the user's global Git configuration.
+When git-cli is loaded, it configures the current Racket process once for the
+Git commands it starts. `GIT_TERMINAL_PROMPT` is set to `0`. When a GUI editor
+is found, `GIT_EDITOR` and `GIT_SEQUENCE_EDITOR` are set to that editor command.
+`run-git` itself no longer copies or rewrites the process environment.
 
 The editor can be inspected or configured explicitly:
 
 ```racket
 (find-editor)
+(find-editors)
 (set-editor! "code --wait")
+(set-editor-auto!)
 ```
 
 The editor search first checks `PATH` and then well-known platform locations.
@@ -158,10 +188,8 @@ application bundle and TextEdit are recognized. On Linux common `/usr`,
 specified explicitly, git-cli prefers a configured or well-known graphical
 tool such as WinMerge, Meld, KDiff3, VS Code, TortoiseMerge, or opendiff.
 The finder checks `PATH` first and then common platform installation locations.
-When a merge tool is found outside `PATH`, git-cli adds that executable's
-directory to the environment of the Git subprocess, so Git's own mergetool
-integration can still find it. If no tool is found, Git is left to select its
-own default.
+`find-mergetool-path` can be used to inspect the executable that was found.
+If no tool is found, Git is left to select its own default.
 
 ```racket
 (find-mergetool)