File operations

* read
* write
* append
* exists?
* tests for each

Readme.org

@@ -1,3 +1,4 @@
+
 #+Title: Relish: Rusty Expressive LIsp SHell
 #+Author: Ava Hahn
 
@@ -155,13 +156,11 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 (See tag: v0.3.0)
 ** TODO v1.0 tasks
 - islist type query
+- assert function
+- set library
 - Can pass args to relish scripts (via interpreter)
 - Can pass args to relish scripts (via command line)
 - File operations
-  - read-to-string
-  - write-to-file
-  - file exists?
-  - (path functions)
   - (add this all to the readme)
 - finish basic goals in the [[file:snippets/interactive-devel.rls][interactive development library]]
 - Release CI
@@ -170,7 +169,6 @@ Note: this section only tracks the state of incomplete TODO items. Having everyt
 - Post release to relevant channels
 ** TODO v1.1 tasks
 - finish stretch goals in the [[file:snippets/interactive-devel.rls][interactive development library]]
-- Stl boolean assert builtin
 - History length configurable (env var?)
 - Lex function
 - Read function (Input + Lex)

src/lex.rs

@@ -82,7 +82,10 @@ fn process(document: &String) -> Result<Box<Seg>, String> {
             delim = *d;
 
             if delim == '*' {
-                token.push(ESCAPES[&c]);
+                token.push(ESCAPES.get(&c)
+                           .cloned()
+                           .or(Some(c))
+                           .unwrap());
                 delim_stack.pop();
                 continue;
 

src/stl.rs

@@ -32,6 +32,7 @@ pub mod control;
 pub mod decl;
 pub mod math;
 pub mod strings;
+pub mod file;
 
 pub const CONSOLE_XDIM_VNAME: &str = "_RELISH_WIDTH";
 pub const CONSOLE_YDIM_VNAME: &str = "_RELISH_HEIGHT";
@@ -66,6 +67,7 @@ pub fn static_stdlib(syms: &mut SymTable) {
     control::add_control_lib(syms);
     boolean::add_bool_lib(syms);
     math::add_math_lib(syms);
+    file::add_file_lib(syms);
 
     syms.insert(
         "call".to_string(),

src/stl/file.rs

@@ -0,0 +1,172 @@
+/* relish: versatile lisp shell
+ * Copyright (C) 2021 Aidan Hahn
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+use crate::segment::{Ctr, Seg, Type};
+use crate::sym::{SymTable, Symbol, ValueType, Args};
+use crate::error::{Traceback, start_trace};
+use std::io::Write;
+use std::fs::{File, read_to_string, OpenOptions};
+use std::rc::Rc;
+use std::path::Path;
+
+
+const READ_TO_STRING_DOCSTRING: &str = "Takes one input (filename).
+If file exists, returns a string containing file contents.
+If the file does not exist returns error.";
+fn read_to_string_callback(ast: &Seg, _syms: &mut SymTable) -> Result<Ctr, Traceback> {
+    if let Ctr::String(ref filename) = *ast.car {
+        let res = read_to_string(filename);
+        if let Ok(s) = res {
+            Ok(Ctr::String(s))
+        } else {
+            Err(start_trace(
+                ("read-file", res.err().unwrap().to_string())
+                    .into()))
+        }
+    } else {
+        Err(start_trace(("read-file", "impossible arg").into()))
+    }
+}
+
+const WRITE_TO_FILE_DOCSTRING: &str = "Takes two inputs: a filename and a string of content.
+Writes contents to the file and returns None.";
+fn write_to_file_callback(ast: &Seg, _syms: &mut SymTable) -> Result<Ctr, Traceback> {
+    if let Ctr::String(ref filename) = *ast.car {
+        if let Ctr::Seg(ref next) = *ast.cdr {
+            if let Ctr::String(ref body) = *next.car {
+                let fres = OpenOptions::new()
+                    .create(true)
+                    .truncate(true)
+                    .write(true)
+                    .open(filename);
+                if fres.is_err() {
+                    Err(start_trace(
+                        ("write-file",
+                         format!("couldn't open file: {}", fres.err().unwrap().to_string()))
+                            .into()))
+                } else {
+                    if let Err(e) = write!(&mut fres.unwrap(), "{}", body) {
+                        Err(start_trace(
+                            ("write-file", format!("failed to write to file: {}", e))
+                                .into()))
+                    } else {
+                        Ok(Ctr::None)
+                    }
+                }
+            } else {
+                Err(start_trace(("write-file", "impossible arg").into()))
+            }
+        } else {
+            Err(start_trace(("write-file", "not enough args").into()))
+        }
+    } else {
+        Err(start_trace(("write-file", "impossible arg").into()))
+    }
+}
+
+const APPEND_TO_FILE_DOCSTRING: &str = "Takes two inputs: a filename and a string of content.
+Appends content to the end of the file and returns None";
+fn append_to_file_callback(ast: &Seg, _syms: &mut SymTable) -> Result<Ctr, Traceback> {
+    if let Ctr::String(ref filename) = *ast.car {
+        if let Ctr::Seg(ref next) = *ast.cdr {
+            if let Ctr::String(ref body) = *next.car {
+                let fres = File::options().append(true).open(filename);
+                if fres.is_err() {
+                    Err(start_trace(
+                        ("append-file",
+                         format!("couldn't open file: {}", fres.err().unwrap().to_string()))
+                            .into()))
+                } else {
+                    if let Err(e) = write!(&mut fres.unwrap(), "{}", body) {
+                        Err(start_trace(
+                            ("append-file", format!("failed to write to file: {}", e))
+                                .into()))
+                    } else {
+                        Ok(Ctr::None)
+                    }
+                }
+            } else {
+                Err(start_trace(("append-file", "impossible arg").into()))
+            }
+        } else {
+            Err(start_trace(("append-file", "not enough args").into()))
+        }
+    } else {
+        Err(start_trace(("append-file", "impossible arg").into()))
+    }
+}
+
+const IS_FILE_EXISTS_DOCSTRING: &str = "Takes one input: a filename.
+Returns true or false depending on if the file exists.";
+fn is_file_exists_callback(ast: &Seg, _syms: &mut SymTable) -> Result<Ctr, Traceback> {
+    if let Ctr::String(ref filename) = *ast.car {
+        Ok(Ctr::Bool(Path::new(&filename).exists()))
+    } else {
+        Err(Traceback::new().with_trace(("exists?", "impossible arg").into()))
+    }
+}
+
+pub fn add_file_lib(syms: &mut SymTable) {
+    syms.insert(
+        "read-file".to_string(),
+        Symbol {
+            name: String::from("read-file"),
+            args: Args::Strict(vec![Type::String]),
+            conditional_branches: false,
+            docs: READ_TO_STRING_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(read_to_string_callback)),
+            ..Default::default()
+        }
+    );
+
+    syms.insert(
+        "write-file".to_string(),
+        Symbol {
+            name: String::from("write-file"),
+            args: Args::Strict(vec![Type::String, Type::String]),
+            conditional_branches: false,
+            docs: WRITE_TO_FILE_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(write_to_file_callback)),
+            ..Default::default()
+        }
+    );
+
+    syms.insert(
+        "append-file".to_string(),
+        Symbol {
+            name: String::from("append-file"),
+            args: Args::Strict(vec![Type::String, Type::String]),
+            conditional_branches: false,
+            docs: APPEND_TO_FILE_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(append_to_file_callback)),
+            ..Default::default()
+        }
+    );
+
+    syms.insert(
+        "exists?".to_string(),
+        Symbol {
+            name: String::from("exists?"),
+            args: Args::Strict(vec![Type::String]),
+            conditional_branches: false,
+            docs: IS_FILE_EXISTS_DOCSTRING.to_string(),
+            value: ValueType::Internal(Rc::new(is_file_exists_callback)),
+            ..Default::default()
+        }
+    );
+
+}

tests/test_lib_file.rs

@@ -0,0 +1,80 @@
+mod file_lib_tests {
+    use relish::ast::{eval, lex, SymTable};
+    use relish::stdlib::{dynamic_stdlib, static_stdlib};
+
+    #[test]
+    fn test_fexists() {
+        let document = "(exists? '/tmp')";
+        let result = "true";
+
+        let mut syms = SymTable::new();
+        static_stdlib(&mut syms);
+        dynamic_stdlib(&mut syms, None);
+        assert_eq!(
+            *eval(&lex(&document.to_string()).unwrap(), &mut syms)
+                .unwrap()
+                .to_string(),
+            result.to_string(),
+        );
+    }
+
+    #[test]
+    fn test_fexists_doesnt() {
+        let document = "(exists? 'cargo.timtam')";
+        let result = "false";
+
+        let mut syms = SymTable::new();
+        static_stdlib(&mut syms);
+        dynamic_stdlib(&mut syms, None);
+        assert_eq!(
+            *eval(&lex(&document.to_string()).unwrap(), &mut syms)
+                .unwrap()
+                .to_string(),
+            result.to_string(),
+        );
+    }
+
+    #[test]
+    fn test_write_file() {
+        let document = "
+          (let ((s 'test')
+                (t '/tmp/relish-lib-test-file-1'))
+            (write-file t s)
+            (echo (read-file t))
+            (eq? (read-file t) s))";
+        let result = "true";
+
+        let mut syms = SymTable::new();
+        static_stdlib(&mut syms);
+        dynamic_stdlib(&mut syms, None);
+        assert_eq!(
+            *eval(&lex(&document.to_string()).unwrap(), &mut syms)
+                .unwrap()
+                .to_string(),
+            result.to_string(),
+        );
+    }
+
+    #[test]
+    fn test_append_file() {
+        let document = "
+          (let ((s 'test')
+                (t '/tmp/relish-lib-test-file-2'))
+            (write-file t s)
+            (append-file t s)
+            (eq? (read-file t)
+                (concat s s)))";
+        let result = "true";
+
+        let mut syms = SymTable::new();
+        static_stdlib(&mut syms);
+        dynamic_stdlib(&mut syms, None);
+        assert_eq!(
+            *eval(&lex(&document.to_string()).unwrap(), &mut syms)
+                .unwrap()
+                .to_string(),
+            result.to_string(),
+        );
+    }
+
+}