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function __fish_complete_proc --description 'Complete by list of running processes'
# Our function runs ps, followed by a massive list of commands passed to sed
set -l ps_cmd
set -l sed_cmds
if test (uname) = Linux
# comm and ucomm return a truncated name, so parse it from the command line field,
# which means we have to trim off the arguments.
# Unfortunately, it doesn't seem to escape spaces - so we can't distinguish
# between the command name, and the first argument. Still, processes with spaces
# in the name seem more common on OS X than on Linux, so prefer to parse out the
# command line rather than using the stat data.
# If the command line is unavailable, you get the stat data in brackets - so
# parse out brackets too.
set ps_cmd 'ps -A -o command'
# Erase everything after the first space
set sed_cmds $sed_cmds 's/ .*//'
# Erases weird stuff Linux gives like kworker/0:0
set sed_cmds $sed_cmds 's|/[0-9]:[0-9]]$||g'
# Retain the last path component only
set sed_cmds $sed_cmds 's|.*/||g'
# Strip off square brackets. Cute, huh?
set sed_cmds $sed_cmds 's/[][]//g'
# Erase things that are just numbers
set sed_cmds $sed_cmds 's/^[0-9]*$//'
else
# OS X, BSD. Preserve leading spaces.
set ps_cmd 'ps axc -o comm'
# Delete parenthesized (zombie) processes
set sed_cmds $sed_cmds '/(.*)/d'
end
# Append sed command to delete first line (the header)
set sed_cmds $sed_cmds '1d'
# Append sed commands to delete leading dashes and trailing spaces
# In principle, commands may have trailing spaces, but ps emits space padding on OS X
set sed_cmds $sed_cmds 's/^-//' 's/ *$//'
# Run ps, pipe it through our massive set of sed commands, then sort and unique
eval $ps_cmd | sed '-e '$sed_cmds | sort -u
end
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