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# shells.nix — Home-Manager module
#
# Reads:
# ${flakeRoot}/assets/conf/dev/terminal/enabled_shells.conf
# ${flakeRoot}/assets/conf/dev/terminal/aliases.conf
#
# For each enabled shell in [enabled_shells]:
# - installs/enables shell (where HM has an enable option)
# - if ${flakeRoot}/assets/conf/dev/terminal/<shell>.conf exists, sources it
# - ensures a *user-editable* aliases file exists in the shells default location
# - if a shell is disabled, its aliases file is removed
# .
# Notes on “editable”:
# - We do NOT manage the aliases file with xdg.configFile/home.file (those would be overwritten).
# - Instead, we create/remove files via home.activation (create only if missing).
{ config, pkgs, lib, flakeRoot, ... }:
let
terminalDir = flakeRoot + "/assets/conf/dev/terminal";
enabledFile = terminalDir + "/enabled_shells.conf";
aliasesFile = terminalDir + "/aliases.conf";
trim = lib.strings.trim;
# ---------- minimal INI-ish parser (sections + raw lines) ----------
readMaybe = p: if builtins.pathExists p then builtins.readFile p else "";
normalizeLine = l: trim (lib.replaceStrings [ "\r" ] [ "" ] l);
parseSections = text:
let
lines = map normalizeLine (lib.splitString "\n" text);
isHeader = l:
let s = l;
in lib.hasPrefix "[" s
&& lib.hasSuffix "]" s
&& builtins.stringLength s >= 3;
nameOf = l: lib.removeSuffix "]" (lib.removePrefix "[" l);
folded =
builtins.foldl'
(st: l:
if l == "" then st else
if isHeader l then st // { current = nameOf l; }
else
let
cur = st.current;
prev = st.sections.${cur} or [];
in
st // { sections = st.sections // { ${cur} = prev ++ [ l ]; }; }
)
{ current = "__root__"; sections = {}; }
lines;
in
folded.sections;
enabledSections = parseSections (readMaybe enabledFile);
aliasSections = parseSections (readMaybe aliasesFile);
# [enabled_shells] lines: key = yes/no
enabledShells =
let
raw = enabledSections.enabled_shells or [];
parseKV = l:
let m = builtins.match ''^([A-Za-z0-9_-]+)[[:space:]]*=[[:space:]]*(.*)$'' l;
in if m == null then null else {
k = trim (builtins.elemAt m 0);
v = lib.toLower (trim (builtins.elemAt m 1));
};
kvs = builtins.filter (x: x != null) (map parseKV raw);
in
map (x: x.k) (builtins.filter (x: x.v == "yes" || x.v == "true" || x.v == "1") kvs);
shellEnabled = shell: builtins.elem shell enabledShells;
# ---------- per-shell repo config file (<shell>.conf) ----------
shellConfPath = shell: terminalDir + "/${shell}.conf";
shellConfExists = shell: builtins.pathExists (shellConfPath shell);
sourceIfExistsSh = p: ''
if [ -f "${toString p}" ]; then
source "${toString p}"
fi
'';
# ---------- aliases section helpers ----------
secLines = name: aliasSections.${name} or [];
secText = name: lib.concatStringsSep "\n" (secLines name);
# Default alias-file locations
bashAliasesPath = "${config.home.homeDirectory}/.bash_aliases";
zshAliasesPath = "${config.home.homeDirectory}/.zsh_aliases";
fishAliasesPath = "${config.xdg.configHome}/fish/conf.d/aliases.fish";
# Seeds (created once; user can edit afterwards)
bashSeed = ''
# Created once from: ${toString aliasesFile}
# Edit freely; Home Manager will not overwrite this file.
#
${secText "bash_zsh"}
${secText "bash_specific"}
'';
zshSeed = ''
# Created once from: ${toString aliasesFile}
# Edit freely; Home Manager will not overwrite this file.
#
${secText "bash_zsh"}
${secText "zsh_specific"}
'';
# Fish: translate [bash_zsh] POSIX alias lines + append [fish_specific] as-is
parsePosixAlias = l:
let
m = builtins.match ''^[[:space:]]*alias[[:space:]]+([A-Za-z0-9_+-]+)=(.*)$'' l;
in
if m == null then null else
let
name = trim (builtins.elemAt m 0);
rhs0 = trim (builtins.elemAt m 1);
unquote =
if lib.hasPrefix "'" rhs0 && lib.hasSuffix "'" rhs0 then
lib.removeSuffix "'" (lib.removePrefix "'" rhs0)
else if lib.hasPrefix "\"" rhs0 && lib.hasSuffix "\"" rhs0 then
lib.removeSuffix "\"" (lib.removePrefix "\"" rhs0)
else
rhs0;
in
{ inherit name; cmd = unquote; };
escapeForFish = s:
lib.replaceStrings
[ "\\" "\"" "$" "`" ]
[ "\\\\" "\\\"" "\\$" "\\`" ]
s;
fishTranslated =
let
parsed = builtins.filter (x: x != null) (map parsePosixAlias (secLines "bash_zsh"));
in
lib.concatStringsSep "\n" (map (a: ''alias ${a.name} "${escapeForFish a.cmd}"'') parsed);
fishSeed = ''
# Created once from: ${toString aliasesFile}
# Edit freely; Home Manager will not overwrite this file.
status is-interactive; or exit
# Translated from [bash_zsh]:
${fishTranslated}
# From [fish_specific]:
${secText "fish_specific"}
'';
in
{
xdg.enable = true;
# Install/enable shells (no login-shell changes)
programs.bash.enable = shellEnabled "bash";
programs.zsh.enable = shellEnabled "zsh";
programs.fish.enable = shellEnabled "fish";
home.packages =
(lib.optionals (shellEnabled "dash") [ pkgs.dash ]) ++
(lib.optionals (shellEnabled "nushell") [ pkgs.nushell ]);
# Source per-shell repo config (if present) AND source the user alias file (if it exists).
# Important: define each option only ONCE.
programs.bash.bashrcExtra = lib.mkIf (shellEnabled "bash") (lib.mkAfter ''
${lib.optionalString (shellConfExists "bash") (sourceIfExistsSh (shellConfPath "bash"))}
if [ -f "${bashAliasesPath}" ]; then
source "${bashAliasesPath}"
fi
'');
programs.zsh.initContent = lib.mkIf (shellEnabled "zsh") (lib.mkAfter ''
${lib.optionalString (shellConfExists "zsh") (sourceIfExistsSh (shellConfPath "zsh"))}
if [ -f "${zshAliasesPath}" ]; then
source "${zshAliasesPath}"
fi
'');
programs.fish.interactiveShellInit = lib.mkIf (shellEnabled "fish") (lib.mkAfter ''
${lib.optionalString (shellConfExists "fish") ''
if test -f "${toString (shellConfPath "fish")}"
source "${toString (shellConfPath "fish")}"
end
''}
if test -f "${fishAliasesPath}"
source "${fishAliasesPath}"
end
'');
# Create/remove alias files based on enabled shells
home.activation.shellAliasesFiles = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
set -euo pipefail
# bash -------------------------------------------------------
if ${if shellEnabled "bash" then "true" else "false"}; then
cat > "${bashAliasesPath}" <<'EOF'
${bashSeed}
EOF
else
rm -f "${bashAliasesPath}"
fi
# zsh -------------------------------------------------------
if ${if shellEnabled "zsh" then "true" else "false"}; then
cat > "${zshAliasesPath}" <<'EOF'
${zshSeed}
EOF
else
rm -f "${zshAliasesPath}"
fi
# fish -------------------------------------------------------
if ${if shellEnabled "fish" then "true" else "false"}; then
mkdir -p "$(dirname "${fishAliasesPath}")"
cat > "${fishAliasesPath}" <<'EOF'
${fishSeed}
EOF
else
rm -f "${fishAliasesPath}"
fi
# fish
if ${if shellEnabled "fish" then "true" else "false"}; then
mkdir -p "$(dirname "${fishAliasesPath}")"
if [ ! -f "${fishAliasesPath}" ]; then
cat > "${fishAliasesPath}" <<'EOF'
${fishSeed}
EOF
fi
else
rm -f "${fishAliasesPath}"
fi
'';
}