#!/bin/sh

# Set this as your pager via the PAGER environment variable. Works great with
# man and every other app that has used it so far.

# Uses my pager.vim macro which just tweaks the vim settings to behave in a
# more pager like way. Get the pager.vim macro and put it in ~/.vim/macros/.
#
# For man pages I also have a man_title.vim a filetype plugin which places the
# man page's topic in the x-terminal's titlebar. Just put it in
# ~/.vim/ftplugin/.
#
# The pager.vim macro and man_title.vim plugin should be available on my site
# (probably right next to where you got this) at
# <http://zhar.net/projects/shell/>.  If not there look around for a vim area,
# I'm thinking about created one.

# 0 - stdin
# 1 - stdout
# 2 - stderr

usage () {
    echo "usage: $(basename $0) [options] [FILE]"
    echo "-g use gui"
    echo "-m file is man page"
    echo "-e use AnsiEsc"
    exit
}

vim="vim"
man=
esc=
while getopts gmeh arg; do
    case $arg in
        g) vim="gvim"; shift;;
        m) man="true"; shift;;
        e) esc="true"; shift;;
        h) usage;;
    esac
done

# run as gvim?
[ `basename $0` = "gpager" ] && vim="gvim"

view="${vim} -R -i ~/.tmp/pager.viminfo"
[ -n "$esc" ] && view="$view -c AnsiEsc"

if [ -t 0 ]; then
    # stdin is open (file on command line)
    if [ -n "$man" ]; then
        # perldoc calls as man viewer w/ tmpfile
        # don't alter the original
        tmp=`mktemp`
        trap "rm -f $tmp; exit" 0 2
        cat "$1" | col -bx > $tmp
        $view -c 'runtime macros/pager.vim' -c 'set ft=man' "$tmp"
    else
        exec $view -c 'runtime macros/pager.vim' "$@"
#        --cmd "au BufNewFile * cq" "$@"
    fi
elif [ -t 1 ]; then
    # stdin closed (0) but stdout open
    # piped input (eg. man viewer)
    if [ -n "$man" ]; then
        # -m indicates man page
        #exec col -bx | $view -c 'set verbose=10' -c 'set vfile=~/vimlog' -c 'runtime macros/pager.vim' -c 'set ft=man' -
        exec col -bx | $view -c 'runtime macros/pager.vim' -c 'set ft=man' -
    else
        exec $view -c 'runtime macros/pager.vim' "$@" -
    fi
else
    # man w/ piped output
    exec cat
fi