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tests: Use math for the prompt counter
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@ -4,7 +4,7 @@ set -g prompt_counter 0
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set -g prompt_counter_incr 0
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function fish_prompt
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if test $prompt_counter_incr -eq 1
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set -g prompt_counter (expr $prompt_counter + 1)
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set -g prompt_counter (math $prompt_counter + 1)
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set -g prompt_counter_incr 0
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end
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echo "prompt $prompt_counter>"
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