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cli: also recognize $GHOSTTY_PAGER

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When defined, GHOSTTY_PAGER takes precedence over PAGER. If either of
those variables is set to an empty value, paging is disabled.
This commit is contained in:
Jon Parise
2026-03-30 10:53:53 -04:00
parent 11d45cd43c
commit 840ab46009
1 changed files with 14 additions and 8 deletions
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22
src/cli/Pager.zig
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@@ -1,7 +1,9 @@
//! A pager wraps output to an external pager program (like `less`) when
//! stdout is a TTY. The pager command is determined by `$PAGER`, falling
//! back to `less` if `$PAGER` isn't set.
//! stdout is a TTY. The pager command is resolved as:
//!
//! `$GHOSTTY_PAGER` > `$PAGER` > `less`
//!
//! Setting either env var to an empty string disables paging.
//! If stdout is not a TTY, writes go directly to stdout.
const Pager = @This();
const std = @import("std");
@@ -51,14 +53,18 @@ fn initPager(alloc: Allocator) ?std.process.Child {
const stdout_file: std.fs.File = .stdout();
if (!stdout_file.isTty()) return null;
// Resolve the pager command: $PAGER > "less".
// An empty $PAGER disables paging.
const env_result = internal_os.getenv(alloc, "PAGER") catch null;
// Resolve the pager command: $GHOSTTY_PAGER > $PAGER > `less`.
// An empty value for either env var disables paging.
const ghostty_var = internal_os.getenv(alloc, "GHOSTTY_PAGER") catch null;
defer if (ghostty_var) |v| v.deinit(alloc);
const pager_var = internal_os.getenv(alloc, "PAGER") catch null;
defer if (pager_var) |v| v.deinit(alloc);
const cmd: ?[]const u8 = cmd: {
const r = env_result orelse break :cmd "less";
break :cmd if (r.value.len > 0) r.value else null;
if (ghostty_var) |v| break :cmd if (v.value.len > 0) v.value else null;
if (pager_var) |v| break :cmd if (v.value.len > 0) v.value else null;
break :cmd "less";
};
defer if (env_result) |r| r.deinit(alloc);
if (cmd == null) return null;