Updated readme, and a bit of commentary.
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README.md
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README.md
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# Pretty #
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`pretty` is an advanced pretty printer for [Lua](lua.org) aiming primarily for
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human readability. It does this by looking for patterns in the input data, and
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creating an output string utilizing and highlighting those patterns. Thus it's
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a primarily a debugging tool, not a speedy serialization tool.
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`pretty` is an advanced pretty printer for [Lua](lua.org). It's primarily a
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debugging tool, aiming for human readability, by detecting pattern in the input
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data, and creating an output string utilizing and highlighting those patterns.
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## Code Example
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Setup is simple, just `pretty = require 'pretty'`, and you're good to go.
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Setup is simple, use `pretty = require 'pretty'`, and you're good to go.
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```lua
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> print(pretty( { 1, 2, 3 } ))
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@ -79,24 +78,27 @@ available.
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## Installation
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TODO
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`pretty` is loadable directly with `require`. Either clone or download this
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repository. Where you place it, depends upon what you want to do:
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1. **You want `pretty` in a specific project**: Place the `pretty` folder
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somewhere in your project, and `require` it from one of your project files.
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2. **You want `pretty` on your system**: Place the `pretty` folder such that
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it's visible from your Lua-path. On my system this might be
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`/usr/local/share/lua/5.1/`. Now you can `require` it from anywhere.
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## API Documentation
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TODO
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`pretty` exposes a single function, the `pretty` function itself. It's function
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signature is `pretty(value, options)`. `value` can be any Lua value. `options`
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must be a table.
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## Tests
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### List of options
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TODO
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`pretty` is sure to complain if you give it an unknown option, or if you give an
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option a bad value.
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## Performance
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As specified in the introduction, `pretty` is not a performance oriented
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library. Expected usage is in error conditions and debugging, not in tight
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inner loops.
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Don't use `pretty.lua` if you want fast serialization. Use one of the pretty
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printers specified below.
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- `indent: string`: The string to indent with. Four spaces (` `) by default.
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## TODO
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@ -108,23 +110,20 @@ I'm looking into implementing following features:
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- Provide nice formatting for `cdata` datatype in LuaJIT.
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- Expand on the comment output in output, for `__tostring` methods, and global
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namespaces like `io` or `math`.
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- Look into using concat operation to improve appearance of overly long
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non-breaking strings. Attempt to break near whitespace.
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- Attempt to fit output within a predefined width limit. Default to 80.
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- Add option for colored output. Primarily syntax highlighting, but also
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[BlueJ-style](www.bluej.org/about.html) scope highlighting, with some faint
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background colors.
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- Look more into `string.dump` in the core library.
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- Find a better name than `pretty`.
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## Other pretty printers
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## Alternative pretty printers
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`pretty` is large, slow, and requires the debug library to work. It's not
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designed for serialization purposes, nor is it concerned with offering the same
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level of customization as other libraries do.
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If you want a sleek, fast, customizable or embeddable library, there are other
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options. Lua has a large library of pretty printers and serialization libraries:
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If you want a sleek, fast, customizable or embeddable library, there are
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thankfully other options.
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- [inspect.lua](github.com/kikito/inspect.lua): One of the classic debugging
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pretty printers.
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@ -136,12 +135,12 @@ options. Lua has a large library of pretty printers and serialization libraries:
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- [binser](github.com/bakpakin/binser): Library for special purpose
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serialization.
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Find others at [the lua-users wiki](lua-users.org/wiki/TableSerialization).
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Even more are available at [the lua-users wiki](lua-users.org/wiki/TableSerialization).
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## Contact
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The author is available at `jonjmaa (at) gmail.com`. Be sure to send an email if
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you have ideas for improvements, find an issue, or even an unintuitive result.
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you have ideas for improvements, or find an issue.
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## License
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10
function.lua
10
function.lua
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@ -111,7 +111,7 @@ local function get_function_info (f)
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if info.source:sub(1,1) == '=' then info.defined_how = 'C'
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elseif info.source:sub(1,1) == '@' then info.defined_how = 'file'
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elseif info.source:find'^%w+.lua$' then info.defined_how = 'file' -- XXX: Hotfix for Love2d boot.lua issue.
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elseif info.source:find'^%w+.lua$' then info.defined_how = 'file' -- Hotfix for Love2d boot.lua issue.
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else info.defined_how = 'string'
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end
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@ -233,6 +233,8 @@ local function width_of_strings_in_l (l, start_i, end_i)
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end
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local function add_indent_to_string (str, indent)
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-- Indents `str` by `indent`.
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assert(type(str) == 'string')
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assert(type(indent) == 'string')
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@ -240,12 +242,16 @@ local function add_indent_to_string (str, indent)
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end
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local function wrap_text (text, max_width)
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-- Creates a wrapped version of given `text`, with no lines longer than
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-- `max_width`. Splits only at whitespace.
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-- TODO: Fix this.
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local l, i, last_i = {}, max_width, 1
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repeat
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if text:sub(i, i) == ' ' then
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l[#l+1], last_i, i = text:sub(last_i, i - 1), i + 1, i + max_width
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elseif i <= last_i then
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-- TODO: Make sure this part works.
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i = text:find(' ', last_i) or #text
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else
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i = i - 1
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@ -393,8 +393,6 @@ local TABLE_TYPE_TO_PAIR_FORMAT = {
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-- Formatting tables
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local function format_table (t, depth, l)
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-- TODO: Add more nuanced formatting.
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-- Error Checking
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assert(type(t) == 'table')
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assert(type(depth) == 'number' and type(l) == 'table')
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local DEBUG_OPTION_USED = { }
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local KNOWN_OPTIONS = {
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_table_addr_comment = { type = 'boolean', default = false, debug = 'debug' },
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_table_addr_comment = { type = 'boolean', default = false, debug = 'debug' }, -- TODO: Maybe automatically display table address when depth = 0?
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indent = { type = 'string', default = ' ' },
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max_depth = { type = 'number', default = math.huge },
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short_builtins = { type = 'boolean', default = false }, -- TODO: Outphase this. Rather automatically use the short versions in places where it would be strange to find the function, like keys, etc.
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recursion = { type = 'string', default = 'ignore', accepted = {['ignore'] = true, ['marked'] = true, ['revisit'] = true} },
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recursion = { type = 'string', default = 'ignore', accepted = {['ignore'] = true, ['marked'] = true, ['revisit'] = true} }, -- TODO: Completely depricate this option. I do not like it.
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}
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local function ensure_that_all_options_are_known (input_options)
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@ -4,7 +4,7 @@
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--[=[ Thoughts on displaying strings in the useful ways.
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TODO
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Thoughts are TODO
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--]=]
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-- Cuts the string up into smaller individual substrings, each Concatted
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-- together. Is uglier compared to longform, but is at least idempotent.
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-- TODO: Attempt to cut near whitespace?
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-- Error checking
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assert( type(str) == 'string' )
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assert(type(depth) == 'number' and type(l) == 'table')
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