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Diffstat (limited to 'spec')
| -rw-r--r-- | spec/system.md | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/spec/system.md b/spec/system.md index 01664e5e..dd17f471 100644 --- a/spec/system.md +++ b/spec/system.md @@ -29,6 +29,7 @@ The effect of `•Eval` should be the same as if its argument were written as so | `•args` | Arguments passed to current file | `•path` | Current file's path | `•name` | Current filename +| `•Exit` | Leave the top-level running program `•Import` loads another BQN script. The script is evaluated in its own isolated scope, and its result is either the result of the last line, or a module if it exports with `⇐` at the top level. If it is a module, then it must be destructured immediately unless first-class namespaces are possible. @@ -40,6 +41,8 @@ The right argument is a filename, which may be relative or absolute. Relative pa `•name` gives the name, including the extension, of the file in which it appears. It doesn't include the path. +`•Exit` immediately terminates the running BQN process. If the argument is a valid return code (on Unix, an integer), it is returned; otherwise, the default return code (the one returned when the end of the program is reached) is used. + ## Files The system namespace value `•file` deals with file operations. For the purposes of `•file`, paths in the filesystem are always strings. As with `•Import`, file paths may be relative or absolute, and relative paths are relative to `•path`, except in `•file.At` which allows `𝕨` to specify an alternate base directory. The value `•path` used for a particular instance of `•file` is determined by the file that contains that instance. @@ -126,12 +129,13 @@ The following short names can also be provided for file access. They can be prov ## Input and output -| Name | Summary -|--------|---------------------- -| `•Out` | Print argument string -| `•Fmt` | Format value for printing +| Name | Summary +|---------|---------------------- +| `•Out` | Print argument string +| `•Show` | Print argument value +| `•Fmt` | Format value for printing -`•Out` prints to stdout, with a trailing newline. `•Fmt` returns a string (not a character table: lines are separated by linefeeds) indicating how `𝕩` would be printed by the interactive environment. +`•Out` prints a string to stdout, with a trailing newline. `•Show` displays a BQN value to the programmer (the representation is not specified, and does not need to be plain text). `•Fmt` returns a string (not a character table: lines are separated by linefeeds) indicating how `𝕩` would be printed by the interactive environment. Both `•Show` and `•Fmt` may take a left argument configuring how the value should be formatted. ## Operation properties |