add bisect information and update man page

XD.1

@@ -26,6 +26,7 @@ tab(;) allbox;
 c;l.
  :;default
  \;;in a git repo
+ =;in a git repo during a bisect
  8;in a git repo with stashed changes
  X;in a git repo during a merge
  O;in a git repo during a rebase
@@ -56,8 +57,8 @@ c;l.
 returns the number that was passed in to allow the user to re-run the program
 and get the same results. If there's an internal error
 .Nm
-returns 1. If you wish to find out more infomation about the error enable ERR
-in the config.mk.
+returns 1. If you wish to find out more infomation about the error pass in
+-Derr at build time.
 .Sh OPTIONS
 .Ss -v
 Print version information to stdout and exit.

src/Git.zig

@@ -114,6 +114,20 @@ pub fn inRebase(self: *Git) bool {
     };
 }
 
+pub fn inBisect(self: *Git) bool {
+    const s = perf.s();
+    defer perf.e(s, @src());
+
+    const path = std.fs.path.join(self.allocator, &[_][]const u8{
+        std.mem.span(self.git_path.ptr),
+        "BISECT_LOG",
+    }) catch return false;
+    defer self.allocator.free(path);
+
+    std.fs.cwd().access(path, .{ .mode = .read_only }) catch return false;
+    return true;
+}
+
 pub fn hasStaged(self: *Git) bool {
     const s = perf.s();
     defer perf.e(s, @src());

src/main.zig

@@ -59,7 +59,12 @@ pub fn main() u8 {
     var git = if (config.git) try @import("Git.zig").init(allocator) orelse null;
     defer if (config.git and git != null) git.?.deinit();
     if (config.git and git != null) {
-        if (git.?.hasStashes()) {
+        if (git.?.inBisect()) {
+            face[@intFromEnum(FaceParts.eyes)] = .{
+                .symbol = '=',
+                .explanation = "The current git repo is bisecting.",
+            };
+        } else if (git.?.hasStashes()) {
             face[@intFromEnum(FaceParts.eyes)] = .{
                 .symbol = '8',
                 .explanation = "The current git repo has stashed changes.",