yaml-get

yaml-get.sh

#!/bin/sh

# XXX THIS DOESN'T WORK XXX

awk -v key="${1?Usage: yaml_get_section <section>}" -v debug=${DEBUG-0} '

    BEGIN { 
        found = 0
        multiline = 0
    }

    { if (debug != "0") print "found=" found " multiline=" multiline " >>" $0 }

    # Skip whitespace
    /^[[:space:]]*$/ { 
        next 
    }

    # Skip comments
    /^[[:space:]]*#/ { 
        next 
    }

    # Find key
    $0 ~ "^" key ":" { 
        # Clear continuation flag 
        if (multiline == 1) { 
            printf("\n")
            multiline = 0
        }
        # Check for inline value
        if (NF>1) { 
            # Inline value
            if (substr($0,length($0),1) == "\\") { 
                # Trailing \
                sub("^.*:[[:space:]]*","")
                sub(".$","")
                found = 1
                printf($0) 
            } else { 
                # Remove leading key value 
                sub("^.*:[[:space:]]*","")
                print 
            } 
        } else {
            # Multi-line value
            found = 1 
        }
        next 
    }

    # New key - clear search
    /^[[:alnum:]]/ { 
        found = 0
        # Clear continuation flag 
        if (multiline == 1) { 
            printf("\n")
            multiline = 0
        }
    }

    # New value
    found == 1 && /^[[:space:]]*-[[:space:]]*/ { 
        if (multiline == 1) { 
            printf("\n")
            multiline = 0
        }
        sub("^[[:space:]]*-[[:space:]]*","")
        printf($0)
        multiline = 1
        next
    }
    # Continuation
    found == 1 && /^[[:space:]]+/ { 
       sub("^[[:space:]]*","") 
       printf(" %s",$0)
    }
'