From bbbd73fc5642ab7ef07385501afb05456b35baa6 Mon Sep 17 00:00:00 2001
From: Pocco81 <pocco451@gmail.com>
Date: Tue, 3 Aug 2021 22:38:03 -0500
Subject: [PATCH] basic parser

---
 install.sh | 173 ++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 151 insertions(+), 22 deletions(-)

diff --git a/install.sh b/install.sh
index 3ad1c00..2b34089 100755
--- a/install.sh
+++ b/install.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 RED='\033[0;31m'
 GREEN='\033[0;32m'
@@ -35,11 +35,10 @@ _usage() {
     -r  | --remove       => Remove the config.
     -u  | --update       => Update the existing config without removing existing stuff.
 "
-    exit 0
 }
 
 _eval_exit() {
-	status=$1
+    status=$1
     suc_msg=$2
     err_msg=$3
 
@@ -54,43 +53,173 @@ _eval_exit() {
 
 }
 
-# _install() {}
+_check_dependencies() {
+    _error_dependencies() {
+        prompt -r "Error: Install ${1} before proceeding."
+        exit 1
+    }
+    command -v git 1>/dev/null || _error_dependencies git
+    return 0
+}
+
+_install() {
+    _check_dependencies
+}
+
 _remove() {
-    prompt -i "-> Cleaning '$HOME/.config/nvim/'"
+    prompt -i "-> Cleaning config ($HOME/.config/nvim/)"
     # rm -rf "$HOME/.config/nvim/"
 
-    prompt -i "-> Cleaning '$HOME/.local/share/nvim/'"
-    # rm -rf "$HOME./local/share/nvim/"
+    prompt -i "-> Cleaning miscellaneous ($HOME/.local/share/nvim/)"
+    # rm -rf "$HOME/.local/share/nvim/"
+
+    prompt -i "-> Cleaning cache ($HOME/.cache/nvim/)"
+    # rm -rf "$HOME/.cache/nvim/"
 }
 # _update() {}
 
-main() {
-    while :; do
-        case $1 in
-        -h | -\? | --help)
-            _usage
-            exit 0
+_init_settings() {
+    no_backup="false"
+    install="false"
+    uninstall="false"
+}
+
+_clean_arg() {
+    arg=$1
+    if [[ "$arg" == "--"* ]]; then
+        echo "${arg:2}"
+    elif [[ "$arg" == "-"* ]]; then
+        echo "${arg:1}"
+    fi
+}
+
+
+_parse_args() {
+	local args_func=$1
+	local argv=("$@")
+    local argc=${#argv[@]}
+	local skip=0
+
+    _skip_ahead() {
+        amount=$1
+        skip=$((skip + amount))
+    }
+
+	_clean_arg() {
+		arg=$1
+		if [[ "$arg" == "--"* ]]; then
+			echo "${arg:2}"
+		elif [[ "$arg" == "-"* ]]; then
+			echo "${arg:1}"
+		fi
+	}
+
+    for j in "${!argv[@]}"; do
+        if [[ ${skip} -gt 0 ]]; then
+            left=$((argc - j))
+            while [[ ${skip} > ${left} ]]; do ((skip--)); done
+            skip=$((skip - 1))
+            continue
+        fi
+
+        case ${argv[j]} in
+        --*) # End of all options.
+            case ${argv[j]} in
+            --) # End of all options.
+                break
+                ;;
+            *)
+                eval "${eval_args}" "$(_clean_arg "${argv[j]}")" "$j"
+                ;;
+            esac
             ;;
-        -i | --install)
-            _install
+        -*)
+            tangled_args=$(_clean_arg "${argv[j]}")
+            for ((k = 0; k < ${#tangled_args}; k++)); do
+                eval "${eval_args}" "${tangled_args:$k:1}" "$j"
+            done
             ;;
-        -r | --remove)
-            _remove
-            _eval_exit $? "Successfully removeed NvChad!" "Failed to remove NvChad"
-            ;;
-        *) # Default case: No more options, so break out of the loop.
-            break
+        *)
+            prompt -w "Warning: flag ''${argv[j]}' not recognized"
             ;;
         esac
-        shift
     done
+}
 
+main() {
+    local argv=("$@")
+    local argc=${#argv[@]}
+    local skip=0
+
+    assert_arg() {
+        var=$1
+        index=$2
+        case ${var} in
+        h | help)
+            _usage
+            ;;
+        i | install)
+            prompt -i "installing..."
+            ;;
+        r | remove)
+            prompt -i "removing..."
+            ;;
+		# p | --path
+        *)
+            prompt -w "Warning: flag '${var}' not recognized"
+            ;;
+        esac
+    }
+
+    _skip_ahead() {
+        amount=$1
+        skip=$((skip + amount))
+    }
+
+	# works for:
+	# 1. normal flags (e.g. -h,--help)
+	# 2. nested flags (e.g. -ivh)
+	# 3. space sperated flags and args (e.g. --option argument)
+	# 4. equal separated flags and args (e.g. --option=argument)
+
+
+    for j in "${!argv[@]}"; do
+        if [[ ${skip} -gt 0 ]]; then
+            left=$((argc - j))
+            while [[ ${skip} > ${left} ]]; do ((skip--)); done
+            skip=$((skip - 1))
+            continue
+        fi
+
+        case ${argv[j]} in
+        --*) # End of all options.
+            case ${argv[j]} in
+            --) # End of all options.
+                break
+                ;;
+            *)
+                assert_arg "$(_clean_arg "${argv[j]}")" "$j"
+                ;;
+            esac
+            ;;
+        -*)
+            tangled_args=$(_clean_arg "${argv[j]}")
+            for ((k = 0; k < ${#tangled_args}; k++)); do
+                assert_arg "${tangled_args:$k:1}" "$j"
+            done
+            ;;
+        *)
+            prompt -w "Warning: flag ''${argv[j]}' not recognized"
+            ;;
+        esac
+    done
 }
 
 init() {
     if [ $# -eq 0 ]; then
         prompt -e "ERROR: This script needs at least one argument"
     else
+        _init_settings
         main "${@}"
     fi
 }