# snapinfo.py

## SYNOPSIS

`snapinfo.py` [options] FILE

## DESCRIPTION

`snapinfo.py` shows information on the registers or RAM in a binary (raw memory) file or a SNA, SZX or Z80 snapshot.

## OPTIONS

`-b, --basic`

  List the BASIC program.

-c, –ctl PATH

  When generating a call graph, specify a control file to use, or a directory from which to read control files. By default, any files whose names start with the input snapshot name (minus the .bin, .sna, .szx or .z80 suffix, if any) and end with .ctl are used, if present. If PATH is ‘-’, standard input is used. This option may be used multiple times.

-f, –find A[,B…[-M[-N]]]

  Search for the byte sequence A, B… with distance ranging from M to N (default=1) between bytes. A, B, etc. and M and N must each be a decimal number, or a hexadecimal number prefixed by ‘0x’. By default, all RAM banks in a 128K snapshot are searched; use the `--page` option to restrict the search to the address range 16384-65535 (0x4000-0xFFFF).

`-g, --call-graph`

  Generate a call graph in DOT format.

-I, –ini param=value

  Set the value of a configuration parameter (see `CONFIGURATION`), overriding any value found in `skoolkit.ini`. This option may be used multiple times.

-o, –org ADDR

  Specify the origin address of a binary (raw memory) file. The default origin address is 65536 minus the length of the file. ADDR must be a decimal number, or a hexadecimal number prefixed by ‘0x’.

-p, –peek A[-B[-C]]

  Show the contents of addresses A TO B STEP C. This option may be used multiple times. A, B and C must each be a decimal number, or a hexadecimal number prefixed by ‘0x’.

-P, –page PAGE

  Specify the page (0-7) of a 128K snapshot to map to 49152-65535.

`--show-config`

  Show configuration parameter values.

-t, –find-text TEXT

  Search for a text string. By default, all RAM banks in a 128K snapshot are searched; use the `--page` option to restrict the search to the address range 16384-65535 (0x4000-0xFFFF).

-T, –find-tile X,Y[-M[-N]]

  Search for the graphic data of the tile at (X,Y) with distance ranging from M to N (default=1) between bytes. M and N must each be a decimal number, or a hexadecimal number prefixed by ‘0x’. By default, all RAM banks in a 128K snapshot are searched; use the `--page` option to restrict the search to the address range 16384-65535 (0x4000-0xFFFF).

`-v, --variables`

  List the contents of the variables area.

`-V, --version`

  Show the SkoolKit version number and exit.

-w, –word A[-B[-C]]

  Show the words (2-byte values) at addresses A TO B STEP C. This option may be used multiple times. A, B and C must each be a decimal number, or a hexadecimal number prefixed by ‘0x’.

## CONFIGURATION

`snapinfo.py` will read configuration from a file named `skoolkit.ini` in the current working directory or in `~/.skoolkit`, if present. The recognised configuration parameters are:

> EdgeAttributes:

>   The default attributes for edges in a call graph (default: none).

> GraphAttributes:

>   The default attributes for a call graph (default: none).

> NodeAttributes:

>   The default attributes for nodes in a call graph (default: `shape=record`).

> NodeId:

>   The format of the node IDs in a call graph (default: `{address}`).

> NodeLabel:

>   The format of the node labels in a call graph (default: `"{address} {address:04X}\n{label}"`).

> Peek:

>   the format of each line of the output produced by the `--peek` option (default: `{address:>5} {address:04X}: {value:>3} {value:02X} {value:08b} {char}`)

> Word:

>   the format of each line of the output produced by the `--word` option (default: `{address:>5} {address:04X}: {value:>5} {value:04X}`)

`NodeId` and `NodeLabel` are standard Python format strings that recognise the replacement fields `address` and `label` (the address and label of the first instruction in the routine represented by the node).

Configuration parameters must appear in a `[snapinfo]` section. For example, to make `snapinfo.py` use open arrowheads and a cyan background colour in call graphs by default, add the following section to `skoolkit.ini`:

    [snapinfo]
    EdgeAttributes=arrowhead=open
    GraphAttributes=bgcolor=cyan

Configuration parameters may also be set on the command line by using the `--ini` option. Parameter values set this way will override any found in `skoolkit.ini`.

## EXAMPLES

1. Display the contents of the registers in `game.z80`:

`snapinfo.py game.z80`

2. Search for the graphic data of the tile currently at (2,3) on screen in `game.z80`, with a distance of 1 or 2 between bytes:

`snapinfo.py -T 2,3-1-2 game.z80`