Fix tmux text being always red
#68
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`tmux` (https://github.com/tmux/tmux/wiki) is a terminal multiplexer, like `screen`. It spawns its terminals with `argv[0]` prefixed with a '-', thus breaking `stderred`'s early return on `bash` encounter. This leads to normal text being always red. When `PROGRAM_NAME` matches the '-%s' format pattern, treat it as a shell and return early. Refer to https://github.com/tmux/tmux/blob/c9d482ab489d5d57d481858091608ee1b32e46ab/window.c#L993 and to tmux/tmux@22d1b94. Fixes ku1ik#52
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tmux(https://github.com/tmux/tmux/wiki) is a terminal multiplexer,like
screen. It spawns its terminals withargv[0]prefixed with a'-', thus breaking
stderred's early return onbashencounter. Thisleads to normal text being always red.
When
PROGRAM_NAMEmatches the '-%s' format pattern, treat it as ashell and return early.
Refer to https://github.com/tmux/tmux/blob/c9d482ab489d5d57d481858091608ee1b32e46ab/window.c#L993
and to tmux/tmux@22d1b94.
Fixes #52