pman

#!/bin/sh
CMD_NAME=`basename $0`
TEMP_FILE="$HOME/.cache/$CMD_NAME.$$.html"

# help
Usage(){
    cat <<- HELPEND
	$CMD_NAME [-b][-f][-u] PageName
	    Open manual page.
	    -b Base Definitions (XBD)     ... C header files.
	    -f System Interfaces (XSH)    ... System calls & C Libraries
	    -u Shell and utillities (XCU) ... Command & C libraries [default]

	$CMD_NAME -s Keyword
	    Searh manual page by keyword.

HELPEND
}

# manual base url
BASE_URL='https://pubs.opengroup.org/'

# manual version
VERSION="9699919799"

# analyze options & params
CATEGORY=idx
PAGE_NAME=fidx2
SEARCH_MODE=
if [ $# -eq 1 ]; then
    CATEGORY=utilities
    PAGE_NAME=$1
elif [ $# -ge 2 ]; then
    case "$1" in
        -b ) CATEGORY=basedefs  ;;
        -f ) CATEGORY=functions ;;
        -u ) CATEGORY=utilities ;;
        -s ) SEARCH_MODE=1      ;;
        *  ) Usage && exit 1    ;;
    esac
    PAGE_NAME=$2
fi

# view POSIX manual
if [ -n "$SEARCH_MODE" ]; then
    wget -q -k -O "$TEMP_FILE" --post-data="value=${PAGE_NAME}" "${BASE_URL}cgi/kman4.cgi"
    w3m -F +10 "$TEMP_FILE"
else
    wget -q -k -O "$TEMP_FILE" "${BASE_URL}onlinepubs/${VERSION}/${CATEGORY}/${PAGE_NAME}.html"
    if [ $? -eq 0 ]; then
        w3m -F "$TEMP_FILE"
    else
        echo "Page '$PAGE_NAME' is not found in '$CATEGORY'" 1>&2
    fi
fi

# cleanup
rm "$TEMP_FILE"