From 8aafc3fa24c7475a07259eb06cd5d217f510df98 Mon Sep 17 00:00:00 2001
From: Gabriel Schneider <gbrls@0x4200.cafe>
Date: Wed, 5 Aug 2026 19:32:30 -0300
Subject: add a Shell builtin, default fish, with per-family prompt integration

---
 src/pardes.zig | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

(limited to 'src/pardes.zig')

diff --git a/src/pardes.zig b/src/pardes.zig
index 61950562..08536544 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -2232,14 +2232,6 @@ fn pathUnder(a: []const u8, b: []const u8) bool {
 }
 
 const tutor_text = @embedFile("tutor.txt");
-const rc_path = "/tmp/pardes-osc133.bash";
-pub const bash_rc =
-    \\[ -f "$HOME/.bashrc" ] && source "$HOME/.bashrc"
-    \\PS1='\[\e]133;A;cl=line\a\]'"$PS1"'\[\e]133;B\a\]'
-    \\PROMPT_COMMAND='printf "\e]133;D\a"'"${PROMPT_COMMAND:+;$PROMPT_COMMAND}"
-    \\trap 'printf "\e]133;C\a"' DEBUG
-    \\
-;
 
 // ---- theme ----
 
@@ -3960,6 +3952,14 @@ pub const Pardes = struct {
     /// its first theme. No frame is rendered in that interval.
     animate_theme_changes: bool = false,
     colors_on: bool = true,
+    /// The binary a NEW terminal execs (the Shell builtin). Inline and fixed
+    /// like every other short string the core keeps, and `0` means "the
+    /// default" rather than a copy of it — so there is no constructor to
+    /// remember and config.default_shell stays the single place the default is
+    /// written. Existing panes are not touched: a shell you are already in is
+    /// a process, not a setting.
+    shell_buf: [255]u8 = undefined,
+    shell_len: u8 = 0,
     /// soft line breaks in file panes (the Wrap builtin). ON by default: a line
     /// running off the right edge is text you cannot read without scrolling
     /// sideways for it, and the reason to reach for the toggle is the rare
@@ -4322,6 +4322,13 @@ pub const Pardes = struct {
         return true;
     }
 
+    /// What a shell should exec for the next terminal — a bare name to be
+    /// looked up, or an absolute path to be used as it stands. The resolving
+    /// is the shells' half: the core has no filesystem to ask.
+    pub fn shellBin(p: *const Pardes) []const u8 {
+        return if (p.shell_len == 0) config.default_shell else p.shell_buf[0..p.shell_len];
+    }
+
     /// Post the transient message on `id`'s last row. Called by a SHELL once
     /// the IO it narrates has actually happened, exactly as openNewFile above
     /// completes a `new_file` effect: the core neither writes files nor owns a
@@ -11033,7 +11040,7 @@ pub const Pardes = struct {
     /// something that has somewhere to put it.
     fn takesArg(b: Builtin) bool {
         switch (b) {
-            .Restore, .Find, .Grep, .Rename, .WsSymbols, .Theme, .Look, .Exec => return true,
+            .Restore, .Find, .Grep, .Rename, .WsSymbols, .Theme, .Shell, .Look, .Exec => return true,
             // Font is a BRANCH and not another name in that prong for the
             // reason output_pane.traits has the same shape: it is not in the
             // enum at all off the gui, and a comptime-false `if` is the one
-- 
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