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* PlatformIOCommand
* Setup and uninstall PlatformIO integration
*/
import { resolve } from "node:path";
import { existsSync, readFileSync, writeFileSync, unlinkSync } from "node:fs";
import IFileConfig from "./types/IFileConfig";
/**
* Resolved paths for PlatformIO project.
*/
interface IPioProjectPaths {
pioIniPath: string;
scriptPath: string;
}
/**
* Get PlatformIO project paths and validate that platformio.ini exists.
* Exits with error if not in a PlatformIO project directory.
*/
function getPioProjectPaths(): IPioProjectPaths {
const pioIniPath = resolve(process.cwd(), "platformio.ini");
const scriptPath = resolve(process.cwd(), "cnext_build.py");
if (!existsSync(pioIniPath)) {
console.error("Error: platformio.ini not found in current directory");
console.error("Run this command from your PlatformIO project root");
process.exit(1);
}
return { pioIniPath, scriptPath };
}
/** The pre-build script entry cnext writes into platformio.ini. */
const CNEXT_BUILD_SCRIPT = "pre:cnext_build.py";
/**
* Remove every occurrence of `entry` together with the whitespace run
* immediately before it.
*
* Replaces /[\n\t ]+pre:cnext_build\.py/g, which retries the whitespace run
* from each of its positions and is super-linear on a long run (S8786).
*
* An occurrence with no whitespace before it is left in place, matching the
* `+` in the original -- that form is handled by the standalone-line replace
* above.
*/
function removeEntryWithLeadingWhitespace(text: string, entry: string): string {
const isIndent = (character: string): boolean =>
character === "\n" || character === "\t" || character === " ";
let result = "";
let cursor = 0;
for (;;) {
const at = text.indexOf(entry, cursor);
if (at === -1) {
return result + text.slice(cursor);
}
let start = at;
while (start > cursor && isIndent(text[start - 1])) {
start -= 1;
}
result +=
start === at
? text.slice(cursor, at + entry.length) // no leading whitespace: keep it
: text.slice(cursor, start);
cursor = at + entry.length;
}
}
/**
* PlatformIO integration commands
*/
class PlatformIOCommand {
/**
* Setup PlatformIO integration
* Creates cnext_build.py and modifies platformio.ini
*/
static install(): void {
const { pioIniPath, scriptPath } = getPioProjectPaths();
// Create cnext_build.py script
// Issue #833: Run transpilation at import time (before compilation),
// not as a pre-action on buildprog (which runs after compilation)
const buildScript = String.raw`Import("env")
import subprocess
import sys
from pathlib import Path
def transpile_cnext():
"""Transpile from main.cnx entry point — cnext follows includes"""
entry = Path("src/main.cnx")
if not entry.exists():
return
print("Transpiling from main.cnx...")
try:
result = subprocess.run(
["cnext", str(entry)],
check=True,
capture_output=True,
text=True
)
if result.stdout:
lines = result.stdout.strip().split("\n")
for line in lines:
if line.startswith(("Compiled", "Collected", "Generated")):
print(f" {line}")
print(" ✓ Transpilation complete")
except subprocess.CalledProcessError as e:
print(f" ✗ Transpilation failed")
print(e.stderr)
sys.exit(1)
# Run transpilation at import time (before compilation starts)
transpile_cnext()
`;
writeFileSync(scriptPath, buildScript, "utf-8");
console.log(`✓ Created: ${scriptPath}`);
// Read platformio.ini
let pioIni = readFileSync(pioIniPath, "utf-8");
// Check if extra_scripts is already present
if (pioIni.includes("cnext_build.py")) {
console.log("✓ PlatformIO already configured for c-next");
return;
}
// Add extra_scripts line to [env:*] section or create it
if (pioIni.includes("extra_scripts")) {
// Append to existing extra_scripts
pioIni = pioIni.replace(
/extra_scripts\s*=\s*(.+)/,
"extra_scripts = $1\n pre:cnext_build.py",
);
} else {
// Add new extra_scripts line after first [env:*] section
pioIni = pioIni.replace(
/(\[env:[^\]]+\])/,
"$1\nextra_scripts = pre:cnext_build.py",
);
}
writeFileSync(pioIniPath, pioIni, "utf-8");
console.log(`✓ Modified: ${pioIniPath}`);
// Setup cnext.config.json for PlatformIO
this.setupConfig();
console.log("");
console.log("✓ PlatformIO integration configured!");
console.log("");
console.log("Next steps:");
console.log(" 1. Create src/main.cnx as your entry point");
console.log(" 2. Use #include to pull in other .cnx files");
console.log(" 3. Run: pio run");
console.log("");
console.log(
"The transpiler will follow includes from main.cnx automatically.",
);
console.log("Commit both .cnx and generated .c files to version control.");
}
/**
* Setup cnext.config.json with PlatformIO-appropriate defaults
* - Appends .pio/libdeps to include array
* - Sets headerOut to "include" if not already set
*/
private static setupConfig(): void {
const configPath = resolve(process.cwd(), "cnext.config.json");
const pioInclude = ".pio/libdeps";
let config: IFileConfig = {};
if (existsSync(configPath)) {
try {
const content = readFileSync(configPath, "utf-8");
config = JSON.parse(content) as IFileConfig;
} catch (e) {
const msg = e instanceof Error ? e.message : String(e);
console.log(
`⚠ Could not parse existing cnext.config.json (${msg}), creating new one`,
);
config = {};
}
}
// Append .pio/libdeps to include array if not already present
const includes = config.include ?? [];
if (!includes.includes(pioInclude)) {
config.include = [...includes, pioInclude];
}
// Set headerOut only if not already set
if (!config.headerOut) {
config.headerOut = "include";
}
// Write config (with pretty formatting)
writeFileSync(configPath, JSON.stringify(config, null, 2) + "\n", "utf-8");
console.log(`✓ Updated: ${configPath}`);
}
/**
* Remove PlatformIO integration
* Deletes cnext_build.py and removes extra_scripts from platformio.ini
*/
static uninstall(): void {
const { pioIniPath, scriptPath } = getPioProjectPaths();
let hasChanges = false;
// Remove cnext_build.py if it exists
if (existsSync(scriptPath)) {
try {
unlinkSync(scriptPath);
console.log(`✓ Removed: ${scriptPath}`);
hasChanges = true;
} catch (err) {
console.error(`Error removing ${scriptPath}:`, err);
process.exit(1);
}
} else {
console.log("✓ cnext_build.py not found (already removed)");
}
// Read platformio.ini
let pioIni = readFileSync(pioIniPath, "utf-8");
// Check if extra_scripts includes cnext_build.py
if (pioIni.includes("cnext_build.py")) {
// Remove the cnext_build.py reference
// Handle both standalone and appended cases
// Remove standalone "extra_scripts = pre:cnext_build.py" line (with newline)
pioIni = pioIni.replace(
/^extra_scripts[ \t]*=[ \t]*pre:cnext_build\.py[ \t]*\n/m,
"",
);
// Remove from multi-line extra_scripts (e.g., " pre:cnext_build.py")
pioIni = removeEntryWithLeadingWhitespace(pioIni, CNEXT_BUILD_SCRIPT);
// Clean up multiple consecutive blank lines
pioIni = pioIni.replaceAll(/\n\n\n+/g, "\n\n");
writeFileSync(pioIniPath, pioIni, "utf-8");
console.log(`✓ Modified: ${pioIniPath}`);
hasChanges = true;
} else {
console.log(
"✓ platformio.ini already clean (no c-next integration found)",
);
}
if (hasChanges) {
console.log("");
console.log("✓ PlatformIO integration removed!");
console.log("");
console.log("Your .cnx files remain untouched.");
console.log("To re-enable integration: cnext --pio-install");
} else {
console.log("");
console.log("No c-next integration found - nothing to remove.");
}
}
}
export default PlatformIOCommand;
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