Python script to generate Ninja build script.

build.py

#!/usr/bin/env python3

import os

# settings
src_dir = "src"
bin_dir = "bin"
target_name = "exe"

file = open("build.ninja", "wt")

file.write("""
#compile rule
cc_flags = -std=c++11 -pedantic -Wall -Wextra -Werror -ggdb
rule cc
    command = g++ $cc_flags -c $in -o $out -MD -MF $out.d
    depfile = $out.d

# linking rule
ld_flags = -static
rule ld
    command = g++ $in -o $out $ld_flags
""")

object_files = []

# create compile commands
file.write("\n# compile commands\n")
for src_file in os.listdir(src_dir):
    if not src_file.endswith('.cpp') and not src_file.endswith('.c') and not src_file.endswith('.cc'):
        continue
    basename = os.path.splitext(src_file)[0]
    obj_file = f"{bin_dir}/obj/{basename}.o"

    file.write(f"build {obj_file}: cc {src_dir}/{src_file}\n")
    object_files.append(obj_file)

# create link command
file.write("\n# link command\n")
file.write(f"build {bin_dir}/{target_name}: ld")
for obj_file in object_files:
    file.write(f" {obj_file}")
file.write("\n")

# close file
file.close()

# make sure there is a bin directory
if not os.path.exists(bin_dir):
    os.makedirs(bin_dir)