// What differs between the systems the compiler itself runs on: how a command line is quoted and run,
// where temporary files go, making and removing files. This one is for Linux and macOS (name_windows.fch has
// the Windows one).
import "stdlib.h"
import "unistd.h"
import "clang-c/Index.h"

// libclang's description of a file that isn't on disk: its Length is C's `unsigned long`, which is 64 bits here
fn unsavedFile(str name, str contents) -> CXUnsavedFile {
    return CXUnsavedFile(Filename: name.ptr, Contents: contents.ptr, Length: u64(contents.len))
}

fn quote(str a) -> str {
    return "'" + a.replace("'", "'\\''") + "'"
}

// run a command line through the shell; its exit code
fn run(str cmd) -> int {
    return shell(cmd)
}

fn nullDevice() -> str {
    return "/dev/null"
}

// the folder for temporary files
fn tempDir() -> str {
    t := getenv("TMPDIR")
    if t.len > 0 {
        if t.ends_with("/") {
            return t.sub(0, t.len - 1)
        }
        return t
    }
    return "/tmp"
}

fn pathSeparator() -> str {
    return ":"
}

fn pid() -> int {
    return int(getpid())
}

// the folder the compiler was started in
fn cwd() -> str {
    return getenv("PWD")
}

// where files that are made once and kept go
fn cacheDir() -> str {
    x := getenv("XDG_CACHE_HOME")
    if x.len > 0 {
        return x + "/finch"
    }
    h := getenv("HOME")
    if h.len > 0 {
        return h + "/.cache/finch"
    }
    return tempDir() + "/finch-cache"
}

// the editor protocol is bytes, not text lines
fn binaryStdio() {
}

fn makeDirs(str path) {
    shell("mkdir -p " + quote(path))
}

fn remove(str path) {
    delete_file(path)
}

fn removeTree(str path) {
    shell("rm -rf " + quote(path))
}

// move a file over another
fn move(str from, str to) {
    shell("mv " + quote(from) + " " + quote(to))
}