Merge pull request #8 from Mathics3/add-!

Start ! to allow running of OS commands

Author: rocky

.github/workflows/ubuntu.yml

@@ -22,6 +22,7 @@ jobs:
       run: |
         sudo apt-get update -qq && sudo apt-get install -qq liblapack-dev llvm-dev
         python -m pip install --upgrade pip
+        python -m pip install -e git://github.com/mathics/Mathics#egg=Mathics3
     - name: Install mathicsscript
       run: |
         make

mathicsscript/__main__.py

@@ -5,9 +5,11 @@
 import sys
 import os
 import re
+import subprocess
 from pathlib import Path
 
 from mathicsscript.termshell import (
+    ShellEscapeException,
     TerminalShell,
     wl_replace_dict_esc,
     wl_replace_pattern,
@@ -333,6 +335,7 @@ def main(
 
             evaluation = Evaluation(shell.definitions, output=TerminalOutput(shell))
             query, source_code = evaluation.parse_feeder_returning_code(shell)
+
             if shell.using_readline and hasattr(GNU_readline, "remove_history_item"):
                 current_pos = GNU_readline.get_current_history_length()
                 for pos in range(last_pos, current_pos - 1):
@@ -355,6 +358,22 @@ def main(
             )
             if result is not None:
                 shell.print_result(result, output_style)
+
+        except ShellEscapeException as e:
+            source_code = e.line
+            if len(source_code) and source_code[1] == "!":
+                try:
+                    print(open(source_code[2:], "r").read())
+                except:
+                    print(str(sys.exc_info()[1]))
+            else:
+                subprocess.run(source_code[1:], shell=True)
+
+                # Should we test exit code for adding to history?
+                GNU_readline.add_history(source_code.rstrip())
+                ## FIXME add this... when in Mathics core updated
+                ## shell.defintions.increment_line(1)
+
         except (KeyboardInterrupt):
             print("\nKeyboardInterrupt")
         except EOFError:

mathicsscript/termshell.py

@@ -115,6 +115,11 @@ def is_pygments_style(style):
     return True
 
 
+class ShellEscapeException(Exception):
+    def __init__(self, line):
+        self.line = line
+
+
 class TerminalShell(LineFeeder):
     def __init__(
         self,
@@ -268,8 +273,12 @@ def out_callback(self, out):
 
     def read_line(self, prompt):
         if self.using_readline:
-            return self.rl_read_line(prompt)
-        return replace_unicode_to_wl(input(prompt))
+            line = self.rl_read_line(prompt)
+        else:
+            line = input(prompt)
+        if line.startswith("!") and self.lineno == 0:
+            raise ShellEscapeException(line)
+        return replace_unicode_to_wl(line)
 
     def print_result(self, result, output_style=""):
         if result is None:

setup.py

@@ -67,7 +67,7 @@ def read(*rnames):
         "": ["inputrc", "inputrc-no-unicode", "inputrc-unicode", "settings/settings.m"]
     },
     install_requires=[
-        "Mathics3 >= 1.1.1",
+        "Mathics3 >= 2.0.0dev",
         "click",
         "colorama",
         "columnize",