misc: scripts to prevent & fix bad mag paths

+ add pre commit githooks to get mag and maglefs
+ add scripts to fix bad use mag paths
+ add scripts to fix bad GDS_STRING mag paths

.githooks/mag-pdkpath.bash

@@ -0,0 +1,21 @@
+#!/bin/env bash
+staged=($(git diff --name-only --cached))
+
+for file in ${staged[@]}
+do
+    filename=$(basename -- "$file")
+    extension="${filename##*.}"
+    if [[ "$extension" = "mag" ]]; then
+        matches=($(sed -n 's/^use\b \+\S\+\ \+\S\+ \+\(\S\+\)/\1/p' $file))
+        for match in ${matches[@]} 
+        do
+            if [[ "$(echo "$match" | sed -n '/PDKPATH\b\|PDK\b\|PDK_ROOT\b/p')" = "" ]]; then
+                echo "error: mag file $file has a <use> statment with a pdk path that's not PDKPATH|PDK|PDK_ROOT"
+                echo "the path used is: $match"
+                echo "you can use: 'git commit -n ..' to ignore this check but that's not recommended"
+                exit 1
+            fi
+        done
+    fi
+done
+

.githooks/maglef-gdspath.bash

@@ -0,0 +1,22 @@
+#!/bin/env bash
+staged=($(git diff --name-only --cached))
+
+for file in ${staged[@]}
+do
+    filename=$(basename -- "$file")
+    extension="${filename##*.}"
+    filename_no_ext="${filename%%.*}"
+    if [[ "$extension" = "mag" ]]; then
+        matches=($(sed -E -n 's/string GDS_FILE +(\S+)/\1/p' $file))
+        for match in ${matches[@]} 
+        do
+            if [[ "$(echo "$match" | sed -n "/..\/gds\/${filename_no_ext}/p")" = "" ]]; then
+                echo "error: maglef file($file) has string GDS_FILE reference that is not valid"
+                echo "the reference used is: $match"
+                echo "you can use: 'git commit -n ..' to ignore this check but that's not recommended"
+                exit 1
+            fi
+        done
+    fi
+done
+

.githooks/pre-commit

@@ -0,0 +1,5 @@
+#!/bin/env bash
+
+./.githooks/mag-pdkpath.bash
+./.githooks/maglef-gdspath.bash
+

scripts/fix_mag.bash

@@ -0,0 +1,9 @@
+#!/bin/env bash
+
+mag_path=$1
+mags=$(find $mag_path -maxdepth 1 -type f -name '*.mag' )
+
+for mag in $mags; do
+    filename=$(basename $mag)
+    sed -i -E 's#(use +sky130_\S+_sc_(\S+)__\S+ +\S+ +)\S+#\1$PDKPATH/libs.ref/sky130_fd_sc_\2/mag#' $filename
+done

scripts/fix_maglef.bash

@@ -0,0 +1,10 @@
+#!/bin/env bash
+
+maglef_path=$1
+maglefs=$(find $maglef_path -maxdepth 1 -type f -name '*.mag' )
+
+for maglef in $maglefs; do
+    filename=$(basename $maglef)
+    filename_no_ext="${filename%%.*}"
+    sed -i -E "s#string GDS_FILE.*#string GDS_FILE ../gds/$filename_no_ext.gds#" $maglef_path/$filename
+done

scripts/setup_githooks.bash

@@ -0,0 +1,3 @@
+#!/bin/env bash
+
+git config core.hooksPath ./.githooks